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<h2><span class="refentrytitle"><a name="glib-GVariant.top_of_page"></a>GVariant</span></h2>
<p>GVariant — strongly typed value datatype</p>
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<a name="glib-GVariant.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">
#include &lt;glib.h&gt;
<a class="link" href="glib-GVariant.html#GVariant" title="GVariant">GVariant</a>;
<span class="returnvalue">void</span> <a class="link" href="glib-GVariant.html#g-variant-unref" title="g_variant_unref ()">g_variant_unref</a> (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>);
<a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * <a class="link" href="glib-GVariant.html#g-variant-ref" title="g_variant_ref ()">g_variant_ref</a> (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>);
<a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * <a class="link" href="glib-GVariant.html#g-variant-ref-sink" title="g_variant_ref_sink ()">g_variant_ref_sink</a> (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>);
const <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="returnvalue">GVariantType</span></a> * <a class="link" href="glib-GVariant.html#g-variant-get-type" title="g_variant_get_type ()">g_variant_get_type</a> (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>);
const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="returnvalue">gchar</span></a> * <a class="link" href="glib-GVariant.html#g-variant-get-type-string" title="g_variant_get_type_string ()">g_variant_get_type_string</a> (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>);
<a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="glib-GVariant.html#g-variant-is-of-type" title="g_variant_is_of_type ()">g_variant_is_of_type</a> (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>,
<em class="parameter"><code>const <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a> *type</code></em>);
<a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="glib-GVariant.html#g-variant-is-container" title="g_variant_is_container ()">g_variant_is_container</a> (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>);
<a class="link" href="glib-GVariant.html#GVariantClass" title="enum GVariantClass"><span class="returnvalue">GVariantClass</span></a> <a class="link" href="glib-GVariant.html#g-variant-classify" title="g_variant_classify ()">g_variant_classify</a> (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>);
enum <a class="link" href="glib-GVariant.html#GVariantClass" title="enum GVariantClass">GVariantClass</a>;
<span class="returnvalue">void</span> <a class="link" href="glib-GVariant.html#g-variant-get" title="g_variant_get ()">g_variant_get</a> (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>,
<em class="parameter"><code>const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="type">gchar</span></a> *format_string</code></em>,
<em class="parameter"><code>...</code></em>);
<span class="returnvalue">void</span> <a class="link" href="glib-GVariant.html#g-variant-get-va" title="g_variant_get_va ()">g_variant_get_va</a> (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>,
<em class="parameter"><code>const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="type">gchar</span></a> *format_string</code></em>,
<em class="parameter"><code>const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="type">gchar</span></a> **endptr</code></em>,
<em class="parameter"><code><span class="type">va_list</span> *app</code></em>);
<a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * <a class="link" href="glib-GVariant.html#g-variant-new" title="g_variant_new ()">g_variant_new</a> (<em class="parameter"><code>const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="type">gchar</span></a> *format_string</code></em>,
<em class="parameter"><code>...</code></em>);
<a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * <a class="link" href="glib-GVariant.html#g-variant-new-va" title="g_variant_new_va ()">g_variant_new_va</a> (<em class="parameter"><code>const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="type">gchar</span></a> *format_string</code></em>,
<em class="parameter"><code>const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="type">gchar</span></a> **endptr</code></em>,
<em class="parameter"><code><span class="type">va_list</span> *app</code></em>);
<a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * <a class="link" href="glib-GVariant.html#g-variant-new-boolean" title="g_variant_new_boolean ()">g_variant_new_boolean</a> (<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="type">gboolean</span></a> boolean</code></em>);
<a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * <a class="link" href="glib-GVariant.html#g-variant-new-byte" title="g_variant_new_byte ()">g_variant_new_byte</a> (<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#guchar" title="guchar"><span class="type">guchar</span></a> byte</code></em>);
<a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * <a class="link" href="glib-GVariant.html#g-variant-new-int16" title="g_variant_new_int16 ()">g_variant_new_int16</a> (<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gint16" title="gint16"><span class="type">gint16</span></a> int16</code></em>);
<a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * <a class="link" href="glib-GVariant.html#g-variant-new-uint16" title="g_variant_new_uint16 ()">g_variant_new_uint16</a> (<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#guint16" title="guint16"><span class="type">guint16</span></a> uint16</code></em>);
<a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * <a class="link" href="glib-GVariant.html#g-variant-new-int32" title="g_variant_new_int32 ()">g_variant_new_int32</a> (<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gint32" title="gint32"><span class="type">gint32</span></a> int32</code></em>);
<a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * <a class="link" href="glib-GVariant.html#g-variant-new-uint32" title="g_variant_new_uint32 ()">g_variant_new_uint32</a> (<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#guint32" title="guint32"><span class="type">guint32</span></a> uint32</code></em>);
<a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * <a class="link" href="glib-GVariant.html#g-variant-new-int64" title="g_variant_new_int64 ()">g_variant_new_int64</a> (<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gint64" title="gint64"><span class="type">gint64</span></a> int64</code></em>);
<a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * <a class="link" href="glib-GVariant.html#g-variant-new-uint64" title="g_variant_new_uint64 ()">g_variant_new_uint64</a> (<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#guint64" title="guint64"><span class="type">guint64</span></a> uint64</code></em>);
<a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * <a class="link" href="glib-GVariant.html#g-variant-new-handle" title="g_variant_new_handle ()">g_variant_new_handle</a> (<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gint32" title="gint32"><span class="type">gint32</span></a> handle</code></em>);
<a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * <a class="link" href="glib-GVariant.html#g-variant-new-double" title="g_variant_new_double ()">g_variant_new_double</a> (<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gdouble" title="gdouble"><span class="type">gdouble</span></a> floating</code></em>);
<a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * <a class="link" href="glib-GVariant.html#g-variant-new-string" title="g_variant_new_string ()">g_variant_new_string</a> (<em class="parameter"><code>const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="type">gchar</span></a> *string</code></em>);
<a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * <a class="link" href="glib-GVariant.html#g-variant-new-object-path" title="g_variant_new_object_path ()">g_variant_new_object_path</a> (<em class="parameter"><code>const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="type">gchar</span></a> *object_path</code></em>);
<a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="glib-GVariant.html#g-variant-is-object-path" title="g_variant_is_object_path ()">g_variant_is_object_path</a> (<em class="parameter"><code>const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="type">gchar</span></a> *string</code></em>);
<a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * <a class="link" href="glib-GVariant.html#g-variant-new-signature" title="g_variant_new_signature ()">g_variant_new_signature</a> (<em class="parameter"><code>const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="type">gchar</span></a> *signature</code></em>);
<a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="glib-GVariant.html#g-variant-is-signature" title="g_variant_is_signature ()">g_variant_is_signature</a> (<em class="parameter"><code>const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="type">gchar</span></a> *string</code></em>);
<a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * <a class="link" href="glib-GVariant.html#g-variant-new-variant" title="g_variant_new_variant ()">g_variant_new_variant</a> (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>);
<a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * <a class="link" href="glib-GVariant.html#g-variant-new-strv" title="g_variant_new_strv ()">g_variant_new_strv</a> (<em class="parameter"><code>const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="type">gchar</span></a> * const *strv</code></em>,
<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gssize" title="gssize"><span class="type">gssize</span></a> length</code></em>);
<a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="glib-GVariant.html#g-variant-get-boolean" title="g_variant_get_boolean ()">g_variant_get_boolean</a> (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>);
<a class="link" href="glib-Basic-Types.html#guchar" title="guchar"><span class="returnvalue">guchar</span></a> <a class="link" href="glib-GVariant.html#g-variant-get-byte" title="g_variant_get_byte ()">g_variant_get_byte</a> (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>);
<a class="link" href="glib-Basic-Types.html#gint16" title="gint16"><span class="returnvalue">gint16</span></a> <a class="link" href="glib-GVariant.html#g-variant-get-int16" title="g_variant_get_int16 ()">g_variant_get_int16</a> (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>);
<a class="link" href="glib-Basic-Types.html#guint16" title="guint16"><span class="returnvalue">guint16</span></a> <a class="link" href="glib-GVariant.html#g-variant-get-uint16" title="g_variant_get_uint16 ()">g_variant_get_uint16</a> (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>);
<a class="link" href="glib-Basic-Types.html#gint32" title="gint32"><span class="returnvalue">gint32</span></a> <a class="link" href="glib-GVariant.html#g-variant-get-int32" title="g_variant_get_int32 ()">g_variant_get_int32</a> (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>);
<a class="link" href="glib-Basic-Types.html#guint32" title="guint32"><span class="returnvalue">guint32</span></a> <a class="link" href="glib-GVariant.html#g-variant-get-uint32" title="g_variant_get_uint32 ()">g_variant_get_uint32</a> (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>);
<a class="link" href="glib-Basic-Types.html#gint64" title="gint64"><span class="returnvalue">gint64</span></a> <a class="link" href="glib-GVariant.html#g-variant-get-int64" title="g_variant_get_int64 ()">g_variant_get_int64</a> (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>);
<a class="link" href="glib-Basic-Types.html#guint64" title="guint64"><span class="returnvalue">guint64</span></a> <a class="link" href="glib-GVariant.html#g-variant-get-uint64" title="g_variant_get_uint64 ()">g_variant_get_uint64</a> (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>);
<a class="link" href="glib-Basic-Types.html#gint32" title="gint32"><span class="returnvalue">gint32</span></a> <a class="link" href="glib-GVariant.html#g-variant-get-handle" title="g_variant_get_handle ()">g_variant_get_handle</a> (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>);
<a class="link" href="glib-Basic-Types.html#gdouble" title="gdouble"><span class="returnvalue">gdouble</span></a> <a class="link" href="glib-GVariant.html#g-variant-get-double" title="g_variant_get_double ()">g_variant_get_double</a> (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>);
const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="returnvalue">gchar</span></a> * <a class="link" href="glib-GVariant.html#g-variant-get-string" title="g_variant_get_string ()">g_variant_get_string</a> (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>,
<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gsize" title="gsize"><span class="type">gsize</span></a> *length</code></em>);
<a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="returnvalue">gchar</span></a> * <a class="link" href="glib-GVariant.html#g-variant-dup-string" title="g_variant_dup_string ()">g_variant_dup_string</a> (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>,
<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gsize" title="gsize"><span class="type">gsize</span></a> *length</code></em>);
<a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * <a class="link" href="glib-GVariant.html#g-variant-get-variant" title="g_variant_get_variant ()">g_variant_get_variant</a> (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>);
const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="returnvalue">gchar</span></a> ** <a class="link" href="glib-GVariant.html#g-variant-get-strv" title="g_variant_get_strv ()">g_variant_get_strv</a> (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>,
<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gsize" title="gsize"><span class="type">gsize</span></a> *length</code></em>);
<a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="returnvalue">gchar</span></a> ** <a class="link" href="glib-GVariant.html#g-variant-dup-strv" title="g_variant_dup_strv ()">g_variant_dup_strv</a> (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>,
<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gsize" title="gsize"><span class="type">gsize</span></a> *length</code></em>);
<a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * <a class="link" href="glib-GVariant.html#g-variant-new-maybe" title="g_variant_new_maybe ()">g_variant_new_maybe</a> (<em class="parameter"><code>const <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a> *child_type</code></em>,
<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *child</code></em>);
<a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * <a class="link" href="glib-GVariant.html#g-variant-new-array" title="g_variant_new_array ()">g_variant_new_array</a> (<em class="parameter"><code>const <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a> *child_type</code></em>,
<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> * const *children</code></em>,
<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gsize" title="gsize"><span class="type">gsize</span></a> n_children</code></em>);
<a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * <a class="link" href="glib-GVariant.html#g-variant-new-tuple" title="g_variant_new_tuple ()">g_variant_new_tuple</a> (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> * const *children</code></em>,
<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gsize" title="gsize"><span class="type">gsize</span></a> n_children</code></em>);
<a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * <a class="link" href="glib-GVariant.html#g-variant-new-dict-entry" title="g_variant_new_dict_entry ()">g_variant_new_dict_entry</a> (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *key</code></em>,
<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>);
<a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * <a class="link" href="glib-GVariant.html#g-variant-get-maybe" title="g_variant_get_maybe ()">g_variant_get_maybe</a> (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>);
<a class="link" href="glib-Basic-Types.html#gsize" title="gsize"><span class="returnvalue">gsize</span></a> <a class="link" href="glib-GVariant.html#g-variant-n-children" title="g_variant_n_children ()">g_variant_n_children</a> (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>);
<a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * <a class="link" href="glib-GVariant.html#g-variant-get-child-value" title="g_variant_get_child_value ()">g_variant_get_child_value</a> (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>,
<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gsize" title="gsize"><span class="type">gsize</span></a> index_</code></em>);
<span class="returnvalue">void</span> <a class="link" href="glib-GVariant.html#g-variant-get-child" title="g_variant_get_child ()">g_variant_get_child</a> (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>,
<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gsize" title="gsize"><span class="type">gsize</span></a> index_</code></em>,
<em class="parameter"><code>const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="type">gchar</span></a> *format_string</code></em>,
<em class="parameter"><code>...</code></em>);
<a class="link" href="glib-Basic-Types.html#gconstpointer" title="gconstpointer"><span class="returnvalue">gconstpointer</span></a> <a class="link" href="glib-GVariant.html#g-variant-get-fixed-array" title="g_variant_get_fixed_array ()">g_variant_get_fixed_array</a> (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>,
<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gsize" title="gsize"><span class="type">gsize</span></a> *n_elements</code></em>,
<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gsize" title="gsize"><span class="type">gsize</span></a> element_size</code></em>);
<a class="link" href="glib-Basic-Types.html#gsize" title="gsize"><span class="returnvalue">gsize</span></a> <a class="link" href="glib-GVariant.html#g-variant-get-size" title="g_variant_get_size ()">g_variant_get_size</a> (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>);
<a class="link" href="glib-Basic-Types.html#gconstpointer" title="gconstpointer"><span class="returnvalue">gconstpointer</span></a> <a class="link" href="glib-GVariant.html#g-variant-get-data" title="g_variant_get_data ()">g_variant_get_data</a> (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>);
<span class="returnvalue">void</span> <a class="link" href="glib-GVariant.html#g-variant-store" title="g_variant_store ()">g_variant_store</a> (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>,
<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gpointer" title="gpointer"><span class="type">gpointer</span></a> data</code></em>);
<a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * <a class="link" href="glib-GVariant.html#g-variant-new-from-data" title="g_variant_new_from_data ()">g_variant_new_from_data</a> (<em class="parameter"><code>const <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a> *type</code></em>,
<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gconstpointer" title="gconstpointer"><span class="type">gconstpointer</span></a> data</code></em>,
<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gsize" title="gsize"><span class="type">gsize</span></a> size</code></em>,
<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="type">gboolean</span></a> trusted</code></em>,
<em class="parameter"><code><a class="link" href="glib-Datasets.html#GDestroyNotify" title="GDestroyNotify ()"><span class="type">GDestroyNotify</span></a> notify</code></em>,
<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gpointer" title="gpointer"><span class="type">gpointer</span></a> user_data</code></em>);
<a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * <a class="link" href="glib-GVariant.html#g-variant-byteswap" title="g_variant_byteswap ()">g_variant_byteswap</a> (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>);
<a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * <a class="link" href="glib-GVariant.html#g-variant-get-normal-form" title="g_variant_get_normal_form ()">g_variant_get_normal_form</a> (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>);
<a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="glib-GVariant.html#g-variant-is-normal-form" title="g_variant_is_normal_form ()">g_variant_is_normal_form</a> (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>);
<a class="link" href="glib-Basic-Types.html#guint" title="guint"><span class="returnvalue">guint</span></a> <a class="link" href="glib-GVariant.html#g-variant-hash" title="g_variant_hash ()">g_variant_hash</a> (<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gconstpointer" title="gconstpointer"><span class="type">gconstpointer</span></a> value</code></em>);
<a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="glib-GVariant.html#g-variant-equal" title="g_variant_equal ()">g_variant_equal</a> (<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gconstpointer" title="gconstpointer"><span class="type">gconstpointer</span></a> one</code></em>,
<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gconstpointer" title="gconstpointer"><span class="type">gconstpointer</span></a> two</code></em>);
<a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="returnvalue">gchar</span></a> * <a class="link" href="glib-GVariant.html#g-variant-print" title="g_variant_print ()">g_variant_print</a> (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>,
<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="type">gboolean</span></a> type_annotate</code></em>);
<a class="link" href="glib-Strings.html#GString" title="GString"><span class="returnvalue">GString</span></a> * <a class="link" href="glib-GVariant.html#g-variant-print-string" title="g_variant_print_string ()">g_variant_print_string</a> (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>,
<em class="parameter"><code><a class="link" href="glib-Strings.html#GString" title="GString"><span class="type">GString</span></a> *string</code></em>,
<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="type">gboolean</span></a> type_annotate</code></em>);
<a class="link" href="glib-GVariant.html#GVariantIter" title="GVariantIter">GVariantIter</a>;
<a class="link" href="glib-GVariant.html#GVariantIter" title="GVariantIter"><span class="returnvalue">GVariantIter</span></a> * <a class="link" href="glib-GVariant.html#g-variant-iter-copy" title="g_variant_iter_copy ()">g_variant_iter_copy</a> (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariantIter" title="GVariantIter"><span class="type">GVariantIter</span></a> *iter</code></em>);
<span class="returnvalue">void</span> <a class="link" href="glib-GVariant.html#g-variant-iter-free" title="g_variant_iter_free ()">g_variant_iter_free</a> (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariantIter" title="GVariantIter"><span class="type">GVariantIter</span></a> *iter</code></em>);
<a class="link" href="glib-Basic-Types.html#gsize" title="gsize"><span class="returnvalue">gsize</span></a> <a class="link" href="glib-GVariant.html#g-variant-iter-init" title="g_variant_iter_init ()">g_variant_iter_init</a> (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariantIter" title="GVariantIter"><span class="type">GVariantIter</span></a> *iter</code></em>,
<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>);
<a class="link" href="glib-Basic-Types.html#gsize" title="gsize"><span class="returnvalue">gsize</span></a> <a class="link" href="glib-GVariant.html#g-variant-iter-n-children" title="g_variant_iter_n_children ()">g_variant_iter_n_children</a> (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariantIter" title="GVariantIter"><span class="type">GVariantIter</span></a> *iter</code></em>);
<a class="link" href="glib-GVariant.html#GVariantIter" title="GVariantIter"><span class="returnvalue">GVariantIter</span></a> * <a class="link" href="glib-GVariant.html#g-variant-iter-new" title="g_variant_iter_new ()">g_variant_iter_new</a> (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>);
<a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * <a class="link" href="glib-GVariant.html#g-variant-iter-next-value" title="g_variant_iter_next_value ()">g_variant_iter_next_value</a> (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariantIter" title="GVariantIter"><span class="type">GVariantIter</span></a> *iter</code></em>);
<a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="glib-GVariant.html#g-variant-iter-next" title="g_variant_iter_next ()">g_variant_iter_next</a> (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariantIter" title="GVariantIter"><span class="type">GVariantIter</span></a> *iter</code></em>,
<em class="parameter"><code>const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="type">gchar</span></a> *format_string</code></em>,
<em class="parameter"><code>...</code></em>);
<a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="glib-GVariant.html#g-variant-iter-loop" title="g_variant_iter_loop ()">g_variant_iter_loop</a> (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariantIter" title="GVariantIter"><span class="type">GVariantIter</span></a> *iter</code></em>,
<em class="parameter"><code>const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="type">gchar</span></a> *format_string</code></em>,
<em class="parameter"><code>...</code></em>);
<a class="link" href="glib-GVariant.html#GVariantBuilder" title="GVariantBuilder">GVariantBuilder</a>;
<span class="returnvalue">void</span> <a class="link" href="glib-GVariant.html#g-variant-builder-unref" title="g_variant_builder_unref ()">g_variant_builder_unref</a> (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariantBuilder" title="GVariantBuilder"><span class="type">GVariantBuilder</span></a> *builder</code></em>);
<a class="link" href="glib-GVariant.html#GVariantBuilder" title="GVariantBuilder"><span class="returnvalue">GVariantBuilder</span></a> * <a class="link" href="glib-GVariant.html#g-variant-builder-ref" title="g_variant_builder_ref ()">g_variant_builder_ref</a> (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariantBuilder" title="GVariantBuilder"><span class="type">GVariantBuilder</span></a> *builder</code></em>);
<a class="link" href="glib-GVariant.html#GVariantBuilder" title="GVariantBuilder"><span class="returnvalue">GVariantBuilder</span></a> * <a class="link" href="glib-GVariant.html#g-variant-builder-new" title="g_variant_builder_new ()">g_variant_builder_new</a> (<em class="parameter"><code>const <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a> *type</code></em>);
<span class="returnvalue">void</span> <a class="link" href="glib-GVariant.html#g-variant-builder-init" title="g_variant_builder_init ()">g_variant_builder_init</a> (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariantBuilder" title="GVariantBuilder"><span class="type">GVariantBuilder</span></a> *builder</code></em>,
<em class="parameter"><code>const <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a> *type</code></em>);
<span class="returnvalue">void</span> <a class="link" href="glib-GVariant.html#g-variant-builder-clear" title="g_variant_builder_clear ()">g_variant_builder_clear</a> (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariantBuilder" title="GVariantBuilder"><span class="type">GVariantBuilder</span></a> *builder</code></em>);
<span class="returnvalue">void</span> <a class="link" href="glib-GVariant.html#g-variant-builder-add-value" title="g_variant_builder_add_value ()">g_variant_builder_add_value</a> (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariantBuilder" title="GVariantBuilder"><span class="type">GVariantBuilder</span></a> *builder</code></em>,
<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>);
<span class="returnvalue">void</span> <a class="link" href="glib-GVariant.html#g-variant-builder-add" title="g_variant_builder_add ()">g_variant_builder_add</a> (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariantBuilder" title="GVariantBuilder"><span class="type">GVariantBuilder</span></a> *builder</code></em>,
<em class="parameter"><code>const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="type">gchar</span></a> *format_string</code></em>,
<em class="parameter"><code>...</code></em>);
<a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * <a class="link" href="glib-GVariant.html#g-variant-builder-end" title="g_variant_builder_end ()">g_variant_builder_end</a> (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariantBuilder" title="GVariantBuilder"><span class="type">GVariantBuilder</span></a> *builder</code></em>);
<span class="returnvalue">void</span> <a class="link" href="glib-GVariant.html#g-variant-builder-open" title="g_variant_builder_open ()">g_variant_builder_open</a> (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariantBuilder" title="GVariantBuilder"><span class="type">GVariantBuilder</span></a> *builder</code></em>,
<em class="parameter"><code>const <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a> *type</code></em>);
<span class="returnvalue">void</span> <a class="link" href="glib-GVariant.html#g-variant-builder-close" title="g_variant_builder_close ()">g_variant_builder_close</a> (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariantBuilder" title="GVariantBuilder"><span class="type">GVariantBuilder</span></a> *builder</code></em>);
#define <a class="link" href="glib-GVariant.html#G-VARIANT-PARSE-ERROR:CAPS" title="G_VARIANT_PARSE_ERROR">G_VARIANT_PARSE_ERROR</a>
<a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * <a class="link" href="glib-GVariant.html#g-variant-parse" title="g_variant_parse ()">g_variant_parse</a> (<em class="parameter"><code>const <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a> *type</code></em>,
<em class="parameter"><code>const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="type">gchar</span></a> *text</code></em>,
<em class="parameter"><code>const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="type">gchar</span></a> *limit</code></em>,
<em class="parameter"><code>const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="type">gchar</span></a> **endptr</code></em>,
<em class="parameter"><code><a class="link" href="glib-Error-Reporting.html#GError" title="GError"><span class="type">GError</span></a> **error</code></em>);
<a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * <a class="link" href="glib-GVariant.html#g-variant-new-parsed-va" title="g_variant_new_parsed_va ()">g_variant_new_parsed_va</a> (<em class="parameter"><code>const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="type">gchar</span></a> *format</code></em>,
<em class="parameter"><code><span class="type">va_list</span> *app</code></em>);
<a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * <a class="link" href="glib-GVariant.html#g-variant-new-parsed" title="g_variant_new_parsed ()">g_variant_new_parsed</a> (<em class="parameter"><code>const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="type">gchar</span></a> *format</code></em>,
<em class="parameter"><code>...</code></em>);
</pre>
</div>
<div class="refsect1" title="Description">
<a name="glib-GVariant.description"></a><h2>Description</h2>
<p>
<a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> is a variant datatype; it stores a value along with
information about the type of that value. The range of possible
values is determined by the type. The type system used by <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a>
is <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a>.
</p>
<p>
<a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instances always have a type and a value (which are given
at construction time). The type and value of a <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance
can never change other than by the <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> itself being
destroyed. A <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> can not contain a pointer.
</p>
<p>
<a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> is reference counted using <a class="link" href="glib-GVariant.html#g-variant-ref" title="g_variant_ref ()"><code class="function">g_variant_ref()</code></a> and
<a class="link" href="glib-GVariant.html#g-variant-unref" title="g_variant_unref ()"><code class="function">g_variant_unref()</code></a>. <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> also has floating reference counts --
see <a class="link" href="glib-GVariant.html#g-variant-ref-sink" title="g_variant_ref_sink ()"><code class="function">g_variant_ref_sink()</code></a>.
</p>
<p>
<a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> is completely threadsafe. A <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance can be
concurrently accessed in any way from any number of threads without
problems.
</p>
<p>
<a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> is heavily optimised for dealing with data in serialised
form. It works particularly well with data located in memory-mapped
files. It can perform nearly all deserialisation operations in a
small constant time, usually touching only a single memory page.
Serialised <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> data can also be sent over the network.
</p>
<p>
<a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> is largely compatible with DBus. Almost all types of
<a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instances can be sent over DBus. See <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a> for
exceptions.
</p>
<p>
For convenience to C programmers, <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> features powerful
varargs-based value construction and destruction. This feature is
designed to be embedded in other libraries.
</p>
<p>
There is a Python-inspired text language for describing <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a>
values. <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> includes a printer for this language and a parser
with type inferencing.
</p>
<div class="refsect2" title="Memory Use">
<a name="id849579"></a><h3>Memory Use</h3>
<p>
<a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> tries to be quite efficient with respect to memory use.
This section gives a rough idea of how much memory is used by the
current implementation. The information here is subject to change
in the future.
</p>
<p>
The memory allocated by <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> can be grouped into 4 broad
purposes: memory for serialised data, memory for the type
information cache, buffer management memory and memory for the
<a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> structure itself.
</p>
<div class="refsect3" title="Serialised Data Memory">
<a name="id872880"></a><h4>Serialised Data Memory</h4>
<p>
This is the memory that is used for storing GVariant data in
serialised form. This is what would be sent over the network or
what would end up on disk.
</p>
<p>
The amount of memory required to store a boolean is 1 byte. 16,
32 and 64 bit integers and double precision floating point numbers
use their "natural" size. Strings (including object path and
signature strings) are stored with a nul terminator, and as such
use the length of the string plus 1 byte.
</p>
<p>
Maybe types use no space at all to represent the null value and
use the same amount of space (sometimes plus one byte) as the
equivalent non-maybe-typed value to represent the non-null case.
</p>
<p>
Arrays use the amount of space required to store each of their
members, concatenated. Additionally, if the items stored in an
array are not of a fixed-size (ie: strings, other arrays, etc)
then an additional framing offset is stored for each item. The
size of this offset is either 1, 2 or 4 bytes depending on the
overall size of the container. Additionally, extra padding bytes
are added as required for alignment of child values.
</p>
<p>
Tuples (including dictionary entries) use the amount of space
required to store each of their members, concatenated, plus one
framing offset (as per arrays) for each non-fixed-sized item in
the tuple, except for the last one. Additionally, extra padding
bytes are added as required for alignment of child values.
</p>
<p>
Variants use the same amount of space as the item inside of the
variant, plus 1 byte, plus the length of the type string for the
item inside the variant.
</p>
<p>
As an example, consider a dictionary mapping strings to variants.
In the case that the dictionary is empty, 0 bytes are required for
the serialisation.
</p>
<p>
If we add an item "width" that maps to the int32 value of 500 then
we will use 4 byte to store the int32 (so 6 for the variant
containing it) and 6 bytes for the string. The variant must be
aligned to 8 after the 6 bytes of the string, so that's 2 extra
bytes. 6 (string) + 2 (padding) + 6 (variant) is 14 bytes used
for the dictionary entry. An additional 1 byte is added to the
array as a framing offset making a total of 15 bytes.
</p>
<p>
If we add another entry, "title" that maps to a nullable string
that happens to have a value of null, then we use 0 bytes for the
null value (and 3 bytes for the variant to contain it along with
its type string) plus 6 bytes for the string. Again, we need 2
padding bytes. That makes a total of 6 + 2 + 3 = 11 bytes.
</p>
<p>
We now require extra padding between the two items in the array.
After the 14 bytes of the first item, that's 2 bytes required. We
now require 2 framing offsets for an extra two bytes. 14 + 2 + 11
+ 2 = 29 bytes to encode the entire two-item dictionary.
</p>
</div>
<div class="refsect3" title="Type Information Cache">
<a name="id872944"></a><h4>Type Information Cache</h4>
<p>
For each GVariant type that currently exists in the program a type
information structure is kept in the type information cache. The
type information structure is required for rapid deserialisation.
</p>
<p>
Continuing with the above example, if a <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> exists with the
type "a{sv}" then a type information struct will exist for
"a{sv}", "{sv}", "s", and "v". Multiple uses of the same type
will share the same type information. Additionally, all
single-digit types are stored in read-only static memory and do
not contribute to the writable memory footprint of a program using
<a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a>.
</p>
<p>
Aside from the type information structures stored in read-only
memory, there are two forms of type information. One is used for
container types where there is a single element type: arrays and
maybe types. The other is used for container types where there
are multiple element types: tuples and dictionary entries.
</p>
<p>
Array type info structures are 6 * sizeof (void *), plus the
memory required to store the type string itself. This means that
on 32bit systems, the cache entry for "a{sv}" would require 30
bytes of memory (plus malloc overhead).
</p>
<p>
Tuple type info structures are 6 * sizeof (void *), plus 4 *
sizeof (void *) for each item in the tuple, plus the memory
required to store the type string itself. A 2-item tuple, for
example, would have a type information structure that consumed
writable memory in the size of 14 * sizeof (void *) (plus type
string) This means that on 32bit systems, the cache entry for
"{sv}" would require 61 bytes of memory (plus malloc overhead).
</p>
<p>
This means that in total, for our "a{sv}" example, 91 bytes of
type information would be allocated.
</p>
<p>
The type information cache, additionally, uses a <a class="link" href="glib-Hash-Tables.html#GHashTable" title="GHashTable"><span class="type">GHashTable</span></a> to
store and lookup the cached items and stores a pointer to this
hash table in static storage. The hash table is freed when there
are zero items in the type cache.
</p>
<p>
Although these sizes may seem large it is important to remember
that a program will probably only have a very small number of
different types of values in it and that only one type information
structure is required for many different values of the same type.
</p>
</div>
<div class="refsect3" title="Buffer Management Memory">
<a name="id873014"></a><h4>Buffer Management Memory</h4>
<p>
<a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> uses an internal buffer management structure to deal
with the various different possible sources of serialised data
that it uses. The buffer is responsible for ensuring that the
correct call is made when the data is no longer in use by
<a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a>. This may involve a <a class="link" href="glib-Memory-Allocation.html#g-free" title="g_free ()"><code class="function">g_free()</code></a> or a <a class="link" href="glib-Memory-Slices.html#g-slice-free" title="g_slice_free()"><code class="function">g_slice_free()</code></a> or
even <a class="link" href="glib-File-Utilities.html#g-mapped-file-unref" title="g_mapped_file_unref ()"><code class="function">g_mapped_file_unref()</code></a>.
</p>
<p>
One buffer management structure is used for each chunk of
serialised data. The size of the buffer management structure is 4
* (void *). On 32bit systems, that's 16 bytes.
</p>
</div>
<div class="refsect3" title="GVariant structure">
<a name="id873068"></a><h4>GVariant structure</h4>
<p>
The size of a <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> structure is 6 * (void *). On 32 bit
systems, that's 24 bytes.
</p>
<p>
<a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> structures only exist if they are explicitly created
with API calls. For example, if a <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> is constructed out of
serialised data for the example given above (with the dictionary)
then although there are 9 individual values that comprise the
entire dictionary (two keys, two values, two variants containing
the values, two dictionary entries, plus the dictionary itself),
only 1 <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance exists -- the one refering to the
dictionary.
</p>
<p>
If calls are made to start accessing the other values then
<a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instances will exist for those values only for as long
as they are in use (ie: until you call <a class="link" href="glib-GVariant.html#g-variant-unref" title="g_variant_unref ()"><code class="function">g_variant_unref()</code></a>). The
type information is shared. The serialised data and the buffer
management structure for that serialised data is shared by the
child.
</p>
</div>
<div class="refsect3" title="Summary">
<a name="id873129"></a><h4>Summary</h4>
<p>
To put the entire example together, for our dictionary mapping
strings to variants (with two entries, as given above), we are
using 91 bytes of memory for type information, 29 byes of memory
for the serialised data, 16 bytes for buffer management and 24
bytes for the <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance, or a total of 160 bytes, plus
malloc overhead. If we were to use <a class="link" href="glib-GVariant.html#g-variant-get-child-value" title="g_variant_get_child_value ()"><code class="function">g_variant_get_child_value()</code></a> to
access the two dictionary entries, we would use an additional 48
bytes. If we were to have other dictionaries of the same type, we
would use more memory for the serialised data and buffer
management for those dictionaries, but the type information would
be shared.
</p>
</div>
</div>
</div>
<div class="refsect1" title="Details">
<a name="glib-GVariant.details"></a><h2>Details</h2>
<div class="refsect2" title="GVariant">
<a name="GVariant"></a><h3>GVariant</h3>
<pre class="programlisting">typedef struct _GVariant GVariant;</pre>
<p>
<a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> is an opaque data structure and can only be accessed
using the following functions.
</p>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_unref ()">
<a name="g-variant-unref"></a><h3>g_variant_unref ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> g_variant_unref (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>);</pre>
<p>
Decreases the reference count of <em class="parameter"><code>value</code></em>. When its reference count
drops to 0, the memory used by the variant is freed.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
<td>a <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a>
</td>
</tr></tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_ref ()">
<a name="g-variant-ref"></a><h3>g_variant_ref ()</h3>
<pre class="programlisting"><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * g_variant_ref (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>);</pre>
<p>
Increases the reference count of <em class="parameter"><code>value</code></em>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
<td>a <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the same <em class="parameter"><code>value</code></em>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_ref_sink ()">
<a name="g-variant-ref-sink"></a><h3>g_variant_ref_sink ()</h3>
<pre class="programlisting"><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * g_variant_ref_sink (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>);</pre>
<p>
<a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> uses a floating reference count system. All functions with
names starting with <code class="literal">g_variant_new_</code> return floating
references.
</p>
<p>
Calling <a class="link" href="glib-GVariant.html#g-variant-ref-sink" title="g_variant_ref_sink ()"><code class="function">g_variant_ref_sink()</code></a> on a <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> with a floating reference
will convert the floating reference into a full reference. Calling
<a class="link" href="glib-GVariant.html#g-variant-ref-sink" title="g_variant_ref_sink ()"><code class="function">g_variant_ref_sink()</code></a> on a non-floating <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> results in an
additional normal reference being added.
</p>
<p>
In other words, if the <em class="parameter"><code>value</code></em> is floating, then this call "assumes
ownership" of the floating reference, converting it to a normal
reference. If the <em class="parameter"><code>value</code></em> is not floating, then this call adds a
new normal reference increasing the reference count by one.
</p>
<p>
All calls that result in a <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance being inserted into a
container will call <a class="link" href="glib-GVariant.html#g-variant-ref-sink" title="g_variant_ref_sink ()"><code class="function">g_variant_ref_sink()</code></a> on the instance. This means
that if the value was just created (and has only its floating
reference) then the container will assume sole ownership of the value
at that point and the caller will not need to unreference it. This
makes certain common styles of programming much easier while still
maintaining normal refcounting semantics in situations where values
are not floating.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
<td>a <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the same <em class="parameter"><code>value</code></em>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_get_type ()">
<a name="g-variant-get-type"></a><h3>g_variant_get_type ()</h3>
<pre class="programlisting">const <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="returnvalue">GVariantType</span></a> * g_variant_get_type (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>);</pre>
<p>
Determines the type of <em class="parameter"><code>value</code></em>.
</p>
<p>
The return value is valid for the lifetime of <em class="parameter"><code>value</code></em> and must not
be freed.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
<td>a <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_get_type_string ()">
<a name="g-variant-get-type-string"></a><h3>g_variant_get_type_string ()</h3>
<pre class="programlisting">const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="returnvalue">gchar</span></a> * g_variant_get_type_string (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>);</pre>
<p>
Returns the type string of <em class="parameter"><code>value</code></em>. Unlike the result of calling
<a class="link" href="glib-GVariantType.html#g-variant-type-peek-string" title="g_variant_type_peek_string ()"><code class="function">g_variant_type_peek_string()</code></a>, this string is nul-terminated. This
string belongs to <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> and must not be freed.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
<td>a <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the type string for the type of <em class="parameter"><code>value</code></em>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_is_of_type ()">
<a name="g-variant-is-of-type"></a><h3>g_variant_is_of_type ()</h3>
<pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a> g_variant_is_of_type (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>,
<em class="parameter"><code>const <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a> *type</code></em>);</pre>
<p>
Checks if a value has a type matching the provided type.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
<td>a <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>type</code></em> :</span></p></td>
<td>a <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> if the type of <em class="parameter"><code>value</code></em> matches <em class="parameter"><code>type</code></em>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_is_container ()">
<a name="g-variant-is-container"></a><h3>g_variant_is_container ()</h3>
<pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a> g_variant_is_container (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>);</pre>
<p>
Checks if <em class="parameter"><code>value</code></em> is a container.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
<td>a <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> if <em class="parameter"><code>value</code></em> is a container
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="g_variant_classify ()">
<a name="g-variant-classify"></a><h3>g_variant_classify ()</h3>
<pre class="programlisting"><a class="link" href="glib-GVariant.html#GVariantClass" title="enum GVariantClass"><span class="returnvalue">GVariantClass</span></a> g_variant_classify (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>);</pre>
<p>
Classifies <em class="parameter"><code>value</code></em> according to its top-level type.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
<td>a <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the <a class="link" href="glib-GVariant.html#GVariantClass" title="enum GVariantClass"><span class="type">GVariantClass</span></a> of <em class="parameter"><code>value</code></em>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="enum GVariantClass">
<a name="GVariantClass"></a><h3>enum GVariantClass</h3>
<pre class="programlisting">typedef enum
{
G_VARIANT_CLASS_BOOLEAN = 'b',
G_VARIANT_CLASS_BYTE = 'y',
G_VARIANT_CLASS_INT16 = 'n',
G_VARIANT_CLASS_UINT16 = 'q',
G_VARIANT_CLASS_INT32 = 'i',
G_VARIANT_CLASS_UINT32 = 'u',
G_VARIANT_CLASS_INT64 = 'x',
G_VARIANT_CLASS_UINT64 = 't',
G_VARIANT_CLASS_HANDLE = 'h',
G_VARIANT_CLASS_DOUBLE = 'd',
G_VARIANT_CLASS_STRING = 's',
G_VARIANT_CLASS_OBJECT_PATH = 'o',
G_VARIANT_CLASS_SIGNATURE = 'g',
G_VARIANT_CLASS_VARIANT = 'v',
G_VARIANT_CLASS_MAYBE = 'm',
G_VARIANT_CLASS_ARRAY = 'a',
G_VARIANT_CLASS_TUPLE = '(',
G_VARIANT_CLASS_DICT_ENTRY = '{'
} GVariantClass;
</pre>
<p>
The range of possible top-level types of <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instances.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><a name="G-VARIANT-CLASS-BOOLEAN:CAPS"></a><span class="term"><code class="literal">G_VARIANT_CLASS_BOOLEAN</code></span></p></td>
<td>The <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> is a boolean.
</td>
</tr>
<tr>
<td><p><a name="G-VARIANT-CLASS-BYTE:CAPS"></a><span class="term"><code class="literal">G_VARIANT_CLASS_BYTE</code></span></p></td>
<td>The <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> is a byte.
</td>
</tr>
<tr>
<td><p><a name="G-VARIANT-CLASS-INT16:CAPS"></a><span class="term"><code class="literal">G_VARIANT_CLASS_INT16</code></span></p></td>
<td>The <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> is a signed 16 bit integer.
</td>
</tr>
<tr>
<td><p><a name="G-VARIANT-CLASS-UINT16:CAPS"></a><span class="term"><code class="literal">G_VARIANT_CLASS_UINT16</code></span></p></td>
<td>The <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> is an unsigned 16 bit integer.
</td>
</tr>
<tr>
<td><p><a name="G-VARIANT-CLASS-INT32:CAPS"></a><span class="term"><code class="literal">G_VARIANT_CLASS_INT32</code></span></p></td>
<td>The <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> is a signed 32 bit integer.
</td>
</tr>
<tr>
<td><p><a name="G-VARIANT-CLASS-UINT32:CAPS"></a><span class="term"><code class="literal">G_VARIANT_CLASS_UINT32</code></span></p></td>
<td>The <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> is an unsigned 32 bit integer.
</td>
</tr>
<tr>
<td><p><a name="G-VARIANT-CLASS-INT64:CAPS"></a><span class="term"><code class="literal">G_VARIANT_CLASS_INT64</code></span></p></td>
<td>The <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> is a signed 64 bit integer.
</td>
</tr>
<tr>
<td><p><a name="G-VARIANT-CLASS-UINT64:CAPS"></a><span class="term"><code class="literal">G_VARIANT_CLASS_UINT64</code></span></p></td>
<td>The <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> is an unsigned 64 bit integer.
</td>
</tr>
<tr>
<td><p><a name="G-VARIANT-CLASS-HANDLE:CAPS"></a><span class="term"><code class="literal">G_VARIANT_CLASS_HANDLE</code></span></p></td>
<td>The <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> is a file handle index.
</td>
</tr>
<tr>
<td><p><a name="G-VARIANT-CLASS-DOUBLE:CAPS"></a><span class="term"><code class="literal">G_VARIANT_CLASS_DOUBLE</code></span></p></td>
<td>The <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> is a double precision floating
point value.
</td>
</tr>
<tr>
<td><p><a name="G-VARIANT-CLASS-STRING:CAPS"></a><span class="term"><code class="literal">G_VARIANT_CLASS_STRING</code></span></p></td>
<td>The <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> is a normal string.
</td>
</tr>
<tr>
<td><p><a name="G-VARIANT-CLASS-OBJECT-PATH:CAPS"></a><span class="term"><code class="literal">G_VARIANT_CLASS_OBJECT_PATH</code></span></p></td>
<td>The <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> is a DBus object path
string.
</td>
</tr>
<tr>
<td><p><a name="G-VARIANT-CLASS-SIGNATURE:CAPS"></a><span class="term"><code class="literal">G_VARIANT_CLASS_SIGNATURE</code></span></p></td>
<td>The <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> is a DBus signature string.
</td>
</tr>
<tr>
<td><p><a name="G-VARIANT-CLASS-VARIANT:CAPS"></a><span class="term"><code class="literal">G_VARIANT_CLASS_VARIANT</code></span></p></td>
<td>The <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> is a variant.
</td>
</tr>
<tr>
<td><p><a name="G-VARIANT-CLASS-MAYBE:CAPS"></a><span class="term"><code class="literal">G_VARIANT_CLASS_MAYBE</code></span></p></td>
<td>The <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> is a maybe-typed value.
</td>
</tr>
<tr>
<td><p><a name="G-VARIANT-CLASS-ARRAY:CAPS"></a><span class="term"><code class="literal">G_VARIANT_CLASS_ARRAY</code></span></p></td>
<td>The <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> is an array.
</td>
</tr>
<tr>
<td><p><a name="G-VARIANT-CLASS-TUPLE:CAPS"></a><span class="term"><code class="literal">G_VARIANT_CLASS_TUPLE</code></span></p></td>
<td>The <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> is a tuple.
</td>
</tr>
<tr>
<td><p><a name="G-VARIANT-CLASS-DICT-ENTRY:CAPS"></a><span class="term"><code class="literal">G_VARIANT_CLASS_DICT_ENTRY</code></span></p></td>
<td>The <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> is a dictionary entry.
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_get ()">
<a name="g-variant-get"></a><h3>g_variant_get ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> g_variant_get (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>,
<em class="parameter"><code>const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="type">gchar</span></a> *format_string</code></em>,
<em class="parameter"><code>...</code></em>);</pre>
<p>
Deconstructs a <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance.
</p>
<p>
Think of this function as an analogue to <code class="function">scanf()</code>.
</p>
<p>
The arguments that are expected by this function are entirely
determined by <em class="parameter"><code>format_string</code></em>. <em class="parameter"><code>format_string</code></em> also restricts the
permissible types of <em class="parameter"><code>value</code></em>. It is an error to give a value with
an incompatible type. See the section on <a href="gvariant-format-strings.html">GVariant Format Strings</a>.
Please note that the syntax of the format string is very likely to be
extended in the future.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
<td>a <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>format_string</code></em> :</span></p></td>
<td>a <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> format string
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>...</code></em> :</span></p></td>
<td>arguments, as per <em class="parameter"><code>format_string</code></em>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_get_va ()">
<a name="g-variant-get-va"></a><h3>g_variant_get_va ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> g_variant_get_va (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>,
<em class="parameter"><code>const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="type">gchar</span></a> *format_string</code></em>,
<em class="parameter"><code>const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="type">gchar</span></a> **endptr</code></em>,
<em class="parameter"><code><span class="type">va_list</span> *app</code></em>);</pre>
<p>
This function is intended to be used by libraries based on <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a>
that want to provide <a class="link" href="glib-GVariant.html#g-variant-get" title="g_variant_get ()"><code class="function">g_variant_get()</code></a>-like functionality to their
users.
</p>
<p>
The API is more general than <a class="link" href="glib-GVariant.html#g-variant-get" title="g_variant_get ()"><code class="function">g_variant_get()</code></a> to allow a wider range
of possible uses.
</p>
<p>
<em class="parameter"><code>format_string</code></em> must still point to a valid format string, but it only
need to be nul-terminated if <em class="parameter"><code>endptr</code></em> is <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>. If <em class="parameter"><code>endptr</code></em> is
non-<a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a> then it is updated to point to the first character past the
end of the format string.
</p>
<p>
<em class="parameter"><code>app</code></em> is a pointer to a <span class="type">va_list</span>. The arguments, according to
<em class="parameter"><code>format_string</code></em>, are collected from this <span class="type">va_list</span> and the list is left
pointing to the argument following the last.
</p>
<p>
These two generalisations allow mixing of multiple calls to
<a class="link" href="glib-GVariant.html#g-variant-new-va" title="g_variant_new_va ()"><code class="function">g_variant_new_va()</code></a> and <a class="link" href="glib-GVariant.html#g-variant-get-va" title="g_variant_get_va ()"><code class="function">g_variant_get_va()</code></a> within a single actual
varargs call by the user.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
<td>a <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>format_string</code></em> :</span></p></td>
<td>a string that is prefixed with a format string
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>endptr</code></em> :</span></p></td>
<td>location to store the end pointer, or <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>app</code></em> :</span></p></td>
<td>a pointer to a <span class="type">va_list</span>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_new ()">
<a name="g-variant-new"></a><h3>g_variant_new ()</h3>
<pre class="programlisting"><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * g_variant_new (<em class="parameter"><code>const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="type">gchar</span></a> *format_string</code></em>,
<em class="parameter"><code>...</code></em>);</pre>
<p>
Creates a new <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance.
</p>
<p>
Think of this function as an analogue to <a class="link" href="glib-String-Utility-Functions.html#g-strdup-printf" title="g_strdup_printf ()"><code class="function">g_strdup_printf()</code></a>.
</p>
<p>
The type of the created instance and the arguments that are
expected by this function are determined by <em class="parameter"><code>format_string</code></em>. See the
section on <GTKDOCLINK HREF="gvariant-format-strings">GVariant Format
Strings</GTKDOCLINK>. Please note that the syntax of the format string is
very likely to be extended in the future.
</p>
<p>
The first character of the format string must not be '*' '?' '@' or
'r'; in essence, a new <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> must always be constructed by this
function (and not merely passed through it unmodified).
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>format_string</code></em> :</span></p></td>
<td>a <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> format string
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>...</code></em> :</span></p></td>
<td>arguments, as per <em class="parameter"><code>format_string</code></em>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a new floating <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_new_va ()">
<a name="g-variant-new-va"></a><h3>g_variant_new_va ()</h3>
<pre class="programlisting"><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * g_variant_new_va (<em class="parameter"><code>const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="type">gchar</span></a> *format_string</code></em>,
<em class="parameter"><code>const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="type">gchar</span></a> **endptr</code></em>,
<em class="parameter"><code><span class="type">va_list</span> *app</code></em>);</pre>
<p>
This function is intended to be used by libraries based on
<a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> that want to provide <a class="link" href="glib-GVariant.html#g-variant-new" title="g_variant_new ()"><code class="function">g_variant_new()</code></a>-like functionality
to their users.
</p>
<p>
The API is more general than <a class="link" href="glib-GVariant.html#g-variant-new" title="g_variant_new ()"><code class="function">g_variant_new()</code></a> to allow a wider range
of possible uses.
</p>
<p>
<em class="parameter"><code>format_string</code></em> must still point to a valid format string, but it only
needs to be nul-terminated if <em class="parameter"><code>endptr</code></em> is <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>. If <em class="parameter"><code>endptr</code></em> is
non-<a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a> then it is updated to point to the first character past the
end of the format string.
</p>
<p>
<em class="parameter"><code>app</code></em> is a pointer to a <span class="type">va_list</span>. The arguments, according to
<em class="parameter"><code>format_string</code></em>, are collected from this <span class="type">va_list</span> and the list is left
pointing to the argument following the last.
</p>
<p>
These two generalisations allow mixing of multiple calls to
<a class="link" href="glib-GVariant.html#g-variant-new-va" title="g_variant_new_va ()"><code class="function">g_variant_new_va()</code></a> and <a class="link" href="glib-GVariant.html#g-variant-get-va" title="g_variant_get_va ()"><code class="function">g_variant_get_va()</code></a> within a single actual
varargs call by the user.
</p>
<p>
The return value will be floating if it was a newly created GVariant
instance (for example, if the format string was "(ii)"). In the case
that the format_string was '*', '?', 'r', or a format starting with
'@' then the collected <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> pointer will be returned unmodified,
without adding any additional references.
</p>
<p>
In order to behave correctly in all cases it is necessary for the
calling function to <a class="link" href="glib-GVariant.html#g-variant-ref-sink" title="g_variant_ref_sink ()"><code class="function">g_variant_ref_sink()</code></a> the return result before
returning control to the user that originally provided the pointer.
At this point, the caller will have their own full reference to the
result. This can also be done by adding the result to a container,
or by passing it to another <a class="link" href="glib-GVariant.html#g-variant-new" title="g_variant_new ()"><code class="function">g_variant_new()</code></a> call.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>format_string</code></em> :</span></p></td>
<td>a string that is prefixed with a format string
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>endptr</code></em> :</span></p></td>
<td>location to store the end pointer, or <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>app</code></em> :</span></p></td>
<td>a pointer to a <span class="type">va_list</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a new, usually floating, <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_new_boolean ()">
<a name="g-variant-new-boolean"></a><h3>g_variant_new_boolean ()</h3>
<pre class="programlisting"><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * g_variant_new_boolean (<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="type">gboolean</span></a> boolean</code></em>);</pre>
<p>
Creates a new boolean <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance -- either <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> or <a class="link" href="glib-Standard-Macros.html#FALSE:CAPS" title="FALSE"><code class="literal">FALSE</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>boolean</code></em> :</span></p></td>
<td>a <a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="type">gboolean</span></a> value
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a new boolean <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_new_byte ()">
<a name="g-variant-new-byte"></a><h3>g_variant_new_byte ()</h3>
<pre class="programlisting"><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * g_variant_new_byte (<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#guchar" title="guchar"><span class="type">guchar</span></a> byte</code></em>);</pre>
<p>
Creates a new byte <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>byte</code></em> :</span></p></td>
<td>a <a class="link" href="glib-Basic-Types.html#guint8" title="guint8"><span class="type">guint8</span></a> value
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a new byte <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_new_int16 ()">
<a name="g-variant-new-int16"></a><h3>g_variant_new_int16 ()</h3>
<pre class="programlisting"><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * g_variant_new_int16 (<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gint16" title="gint16"><span class="type">gint16</span></a> int16</code></em>);</pre>
<p>
Creates a new int16 <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>int16</code></em> :</span></p></td>
<td>a <a class="link" href="glib-Basic-Types.html#gint16" title="gint16"><span class="type">gint16</span></a> value
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a new int16 <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_new_uint16 ()">
<a name="g-variant-new-uint16"></a><h3>g_variant_new_uint16 ()</h3>
<pre class="programlisting"><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * g_variant_new_uint16 (<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#guint16" title="guint16"><span class="type">guint16</span></a> uint16</code></em>);</pre>
<p>
Creates a new uint16 <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>uint16</code></em> :</span></p></td>
<td>a <a class="link" href="glib-Basic-Types.html#guint16" title="guint16"><span class="type">guint16</span></a> value
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a new uint16 <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_new_int32 ()">
<a name="g-variant-new-int32"></a><h3>g_variant_new_int32 ()</h3>
<pre class="programlisting"><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * g_variant_new_int32 (<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gint32" title="gint32"><span class="type">gint32</span></a> int32</code></em>);</pre>
<p>
Creates a new int32 <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>int32</code></em> :</span></p></td>
<td>a <a class="link" href="glib-Basic-Types.html#gint32" title="gint32"><span class="type">gint32</span></a> value
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a new int32 <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_new_uint32 ()">
<a name="g-variant-new-uint32"></a><h3>g_variant_new_uint32 ()</h3>
<pre class="programlisting"><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * g_variant_new_uint32 (<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#guint32" title="guint32"><span class="type">guint32</span></a> uint32</code></em>);</pre>
<p>
Creates a new uint32 <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>uint32</code></em> :</span></p></td>
<td>a <a class="link" href="glib-Basic-Types.html#guint32" title="guint32"><span class="type">guint32</span></a> value
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a new uint32 <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_new_int64 ()">
<a name="g-variant-new-int64"></a><h3>g_variant_new_int64 ()</h3>
<pre class="programlisting"><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * g_variant_new_int64 (<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gint64" title="gint64"><span class="type">gint64</span></a> int64</code></em>);</pre>
<p>
Creates a new int64 <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>int64</code></em> :</span></p></td>
<td>a <a class="link" href="glib-Basic-Types.html#gint64" title="gint64"><span class="type">gint64</span></a> value
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a new int64 <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_new_uint64 ()">
<a name="g-variant-new-uint64"></a><h3>g_variant_new_uint64 ()</h3>
<pre class="programlisting"><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * g_variant_new_uint64 (<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#guint64" title="guint64"><span class="type">guint64</span></a> uint64</code></em>);</pre>
<p>
Creates a new uint64 <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>uint64</code></em> :</span></p></td>
<td>a <a class="link" href="glib-Basic-Types.html#guint64" title="guint64"><span class="type">guint64</span></a> value
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a new uint64 <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_new_handle ()">
<a name="g-variant-new-handle"></a><h3>g_variant_new_handle ()</h3>
<pre class="programlisting"><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * g_variant_new_handle (<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gint32" title="gint32"><span class="type">gint32</span></a> handle</code></em>);</pre>
<p>
Creates a new handle <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance.
</p>
<p>
By convention, handles are indexes into an array of file descriptors
that are sent alongside a DBus message. If you're not interacting
with DBus, you probably don't need them.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>handle</code></em> :</span></p></td>
<td>a <a class="link" href="glib-Basic-Types.html#gint32" title="gint32"><span class="type">gint32</span></a> value
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a new handle <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_new_double ()">
<a name="g-variant-new-double"></a><h3>g_variant_new_double ()</h3>
<pre class="programlisting"><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * g_variant_new_double (<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gdouble" title="gdouble"><span class="type">gdouble</span></a> floating</code></em>);</pre>
<p>
Creates a new double <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>floating</code></em> :</span></p></td>
<td>a <a class="link" href="glib-Basic-Types.html#gdouble" title="gdouble"><span class="type">gdouble</span></a> floating point value
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a new double <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_new_string ()">
<a name="g-variant-new-string"></a><h3>g_variant_new_string ()</h3>
<pre class="programlisting"><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * g_variant_new_string (<em class="parameter"><code>const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="type">gchar</span></a> *string</code></em>);</pre>
<p>
Creates a string <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> with the contents of <em class="parameter"><code>string</code></em>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>string</code></em> :</span></p></td>
<td>a normal C nul-terminated string
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a new string <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_new_object_path ()">
<a name="g-variant-new-object-path"></a><h3>g_variant_new_object_path ()</h3>
<pre class="programlisting"><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * g_variant_new_object_path (<em class="parameter"><code>const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="type">gchar</span></a> *object_path</code></em>);</pre>
<p>
Creates a DBus object path <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> with the contents of <em class="parameter"><code>string</code></em>.
<em class="parameter"><code>string</code></em> must be a valid DBus object path. Use
<a class="link" href="glib-GVariant.html#g-variant-is-object-path" title="g_variant_is_object_path ()"><code class="function">g_variant_is_object_path()</code></a> if you're not sure.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>object_path</code></em> :</span></p></td>
<td>a normal C nul-terminated string
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a new object path <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_is_object_path ()">
<a name="g-variant-is-object-path"></a><h3>g_variant_is_object_path ()</h3>
<pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a> g_variant_is_object_path (<em class="parameter"><code>const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="type">gchar</span></a> *string</code></em>);</pre>
<p>
Determines if a given string is a valid DBus object path. You
should ensure that a string is a valid DBus object path before
passing it to <a class="link" href="glib-GVariant.html#g-variant-new-object-path" title="g_variant_new_object_path ()"><code class="function">g_variant_new_object_path()</code></a>.
</p>
<p>
A valid object path starts with '/' followed by zero or more
sequences of characters separated by '/' characters. Each sequence
must contain only the characters "[A-Z][a-z][0-9]_". No sequence
(including the one following the final '/' character) may be empty.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>string</code></em> :</span></p></td>
<td>a normal C nul-terminated string
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> if <em class="parameter"><code>string</code></em> is a DBus object path
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_new_signature ()">
<a name="g-variant-new-signature"></a><h3>g_variant_new_signature ()</h3>
<pre class="programlisting"><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * g_variant_new_signature (<em class="parameter"><code>const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="type">gchar</span></a> *signature</code></em>);</pre>
<p>
Creates a DBus type signature <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> with the contents of
<em class="parameter"><code>string</code></em>. <em class="parameter"><code>string</code></em> must be a valid DBus type signature. Use
<a class="link" href="glib-GVariant.html#g-variant-is-signature" title="g_variant_is_signature ()"><code class="function">g_variant_is_signature()</code></a> if you're not sure.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>signature</code></em> :</span></p></td>
<td>a normal C nul-terminated string
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a new signature <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_is_signature ()">
<a name="g-variant-is-signature"></a><h3>g_variant_is_signature ()</h3>
<pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a> g_variant_is_signature (<em class="parameter"><code>const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="type">gchar</span></a> *string</code></em>);</pre>
<p>
Determines if a given string is a valid DBus type signature. You
should ensure that a string is a valid DBus object path before
passing it to <a class="link" href="glib-GVariant.html#g-variant-new-signature" title="g_variant_new_signature ()"><code class="function">g_variant_new_signature()</code></a>.
</p>
<p>
DBus type signatures consist of zero or more definite <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a>
strings in sequence.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>string</code></em> :</span></p></td>
<td>a normal C nul-terminated string
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> if <em class="parameter"><code>string</code></em> is a DBus type signature
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_new_variant ()">
<a name="g-variant-new-variant"></a><h3>g_variant_new_variant ()</h3>
<pre class="programlisting"><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * g_variant_new_variant (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>);</pre>
<p>
Boxes <em class="parameter"><code>value</code></em>. The result is a <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance representing a
variant containing the original value.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
<td>a <span class="type">GVariance</span> instance
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a new variant <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_new_strv ()">
<a name="g-variant-new-strv"></a><h3>g_variant_new_strv ()</h3>
<pre class="programlisting"><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * g_variant_new_strv (<em class="parameter"><code>const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="type">gchar</span></a> * const *strv</code></em>,
<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gssize" title="gssize"><span class="type">gssize</span></a> length</code></em>);</pre>
<p>
Constructs an array of strings <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> from the given array of
strings.
</p>
<p>
If <em class="parameter"><code>length</code></em> is not -1 then it gives the maximum length of <em class="parameter"><code>strv</code></em>. In
any case, a <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a> pointer in <em class="parameter"><code>strv</code></em> is taken as a terminator.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>strv</code></em> :</span></p></td>
<td>an array of strings
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>length</code></em> :</span></p></td>
<td>the length of <em class="parameter"><code>strv</code></em>, or -1
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a new floating <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_get_boolean ()">
<a name="g-variant-get-boolean"></a><h3>g_variant_get_boolean ()</h3>
<pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a> g_variant_get_boolean (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>);</pre>
<p>
Returns the boolean value of <em class="parameter"><code>value</code></em>.
</p>
<p>
It is an error to call this function with a <em class="parameter"><code>value</code></em> of any type
other than <a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-BOOLEAN:CAPS" title="G_VARIANT_TYPE_BOOLEAN"><code class="literal">G_VARIANT_TYPE_BOOLEAN</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
<td>a boolean <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> or <a class="link" href="glib-Standard-Macros.html#FALSE:CAPS" title="FALSE"><code class="literal">FALSE</code></a>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_get_byte ()">
<a name="g-variant-get-byte"></a><h3>g_variant_get_byte ()</h3>
<pre class="programlisting"><a class="link" href="glib-Basic-Types.html#guchar" title="guchar"><span class="returnvalue">guchar</span></a> g_variant_get_byte (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>);</pre>
<p>
Returns the byte value of <em class="parameter"><code>value</code></em>.
</p>
<p>
It is an error to call this function with a <em class="parameter"><code>value</code></em> of any type
other than <a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-BYTE:CAPS" title="G_VARIANT_TYPE_BYTE"><code class="literal">G_VARIANT_TYPE_BYTE</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
<td>a byte <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a <a class="link" href="glib-Basic-Types.html#guchar" title="guchar"><span class="type">guchar</span></a>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_get_int16 ()">
<a name="g-variant-get-int16"></a><h3>g_variant_get_int16 ()</h3>
<pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gint16" title="gint16"><span class="returnvalue">gint16</span></a> g_variant_get_int16 (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>);</pre>
<p>
Returns the 16-bit signed integer value of <em class="parameter"><code>value</code></em>.
</p>
<p>
It is an error to call this function with a <em class="parameter"><code>value</code></em> of any type
other than <a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-INT16:CAPS" title="G_VARIANT_TYPE_INT16"><code class="literal">G_VARIANT_TYPE_INT16</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
<td>a int16 <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a <a class="link" href="glib-Basic-Types.html#gint16" title="gint16"><span class="type">gint16</span></a>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_get_uint16 ()">
<a name="g-variant-get-uint16"></a><h3>g_variant_get_uint16 ()</h3>
<pre class="programlisting"><a class="link" href="glib-Basic-Types.html#guint16" title="guint16"><span class="returnvalue">guint16</span></a> g_variant_get_uint16 (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>);</pre>
<p>
Returns the 16-bit unsigned integer value of <em class="parameter"><code>value</code></em>.
</p>
<p>
It is an error to call this function with a <em class="parameter"><code>value</code></em> of any type
other than <a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-UINT16:CAPS" title="G_VARIANT_TYPE_UINT16"><code class="literal">G_VARIANT_TYPE_UINT16</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
<td>a uint16 <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a <a class="link" href="glib-Basic-Types.html#guint16" title="guint16"><span class="type">guint16</span></a>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_get_int32 ()">
<a name="g-variant-get-int32"></a><h3>g_variant_get_int32 ()</h3>
<pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gint32" title="gint32"><span class="returnvalue">gint32</span></a> g_variant_get_int32 (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>);</pre>
<p>
Returns the 32-bit signed integer value of <em class="parameter"><code>value</code></em>.
</p>
<p>
It is an error to call this function with a <em class="parameter"><code>value</code></em> of any type
other than <a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-INT32:CAPS" title="G_VARIANT_TYPE_INT32"><code class="literal">G_VARIANT_TYPE_INT32</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
<td>a int32 <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a <a class="link" href="glib-Basic-Types.html#gint32" title="gint32"><span class="type">gint32</span></a>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_get_uint32 ()">
<a name="g-variant-get-uint32"></a><h3>g_variant_get_uint32 ()</h3>
<pre class="programlisting"><a class="link" href="glib-Basic-Types.html#guint32" title="guint32"><span class="returnvalue">guint32</span></a> g_variant_get_uint32 (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>);</pre>
<p>
Returns the 32-bit unsigned integer value of <em class="parameter"><code>value</code></em>.
</p>
<p>
It is an error to call this function with a <em class="parameter"><code>value</code></em> of any type
other than <a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-UINT32:CAPS" title="G_VARIANT_TYPE_UINT32"><code class="literal">G_VARIANT_TYPE_UINT32</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
<td>a uint32 <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a <a class="link" href="glib-Basic-Types.html#guint32" title="guint32"><span class="type">guint32</span></a>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_get_int64 ()">
<a name="g-variant-get-int64"></a><h3>g_variant_get_int64 ()</h3>
<pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gint64" title="gint64"><span class="returnvalue">gint64</span></a> g_variant_get_int64 (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>);</pre>
<p>
Returns the 64-bit signed integer value of <em class="parameter"><code>value</code></em>.
</p>
<p>
It is an error to call this function with a <em class="parameter"><code>value</code></em> of any type
other than <a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-INT64:CAPS" title="G_VARIANT_TYPE_INT64"><code class="literal">G_VARIANT_TYPE_INT64</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
<td>a int64 <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a <a class="link" href="glib-Basic-Types.html#gint64" title="gint64"><span class="type">gint64</span></a>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_get_uint64 ()">
<a name="g-variant-get-uint64"></a><h3>g_variant_get_uint64 ()</h3>
<pre class="programlisting"><a class="link" href="glib-Basic-Types.html#guint64" title="guint64"><span class="returnvalue">guint64</span></a> g_variant_get_uint64 (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>);</pre>
<p>
Returns the 64-bit unsigned integer value of <em class="parameter"><code>value</code></em>.
</p>
<p>
It is an error to call this function with a <em class="parameter"><code>value</code></em> of any type
other than <a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-UINT64:CAPS" title="G_VARIANT_TYPE_UINT64"><code class="literal">G_VARIANT_TYPE_UINT64</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
<td>a uint64 <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a <a class="link" href="glib-Basic-Types.html#guint64" title="guint64"><span class="type">guint64</span></a>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_get_handle ()">
<a name="g-variant-get-handle"></a><h3>g_variant_get_handle ()</h3>
<pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gint32" title="gint32"><span class="returnvalue">gint32</span></a> g_variant_get_handle (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>);</pre>
<p>
Returns the 32-bit signed integer value of <em class="parameter"><code>value</code></em>.
</p>
<p>
It is an error to call this function with a <em class="parameter"><code>value</code></em> of any type other
than <a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-HANDLE:CAPS" title="G_VARIANT_TYPE_HANDLE"><code class="literal">G_VARIANT_TYPE_HANDLE</code></a>.
</p>
<p>
By convention, handles are indexes into an array of file descriptors
that are sent alongside a DBus message. If you're not interacting
with DBus, you probably don't need them.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
<td>a handle <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a <a class="link" href="glib-Basic-Types.html#gint32" title="gint32"><span class="type">gint32</span></a>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_get_double ()">
<a name="g-variant-get-double"></a><h3>g_variant_get_double ()</h3>
<pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gdouble" title="gdouble"><span class="returnvalue">gdouble</span></a> g_variant_get_double (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>);</pre>
<p>
Returns the double precision floating point value of <em class="parameter"><code>value</code></em>.
</p>
<p>
It is an error to call this function with a <em class="parameter"><code>value</code></em> of any type
other than <a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-DOUBLE:CAPS" title="G_VARIANT_TYPE_DOUBLE"><code class="literal">G_VARIANT_TYPE_DOUBLE</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
<td>a double <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a <a class="link" href="glib-Basic-Types.html#gdouble" title="gdouble"><span class="type">gdouble</span></a>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_get_string ()">
<a name="g-variant-get-string"></a><h3>g_variant_get_string ()</h3>
<pre class="programlisting">const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="returnvalue">gchar</span></a> * g_variant_get_string (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>,
<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gsize" title="gsize"><span class="type">gsize</span></a> *length</code></em>);</pre>
<p>
Returns the string value of a <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance with a string
type. This includes the types <a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-STRING:CAPS" title="G_VARIANT_TYPE_STRING"><code class="literal">G_VARIANT_TYPE_STRING</code></a>,
<a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-OBJECT-PATH:CAPS" title="G_VARIANT_TYPE_OBJECT_PATH"><code class="literal">G_VARIANT_TYPE_OBJECT_PATH</code></a> and <a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-SIGNATURE:CAPS" title="G_VARIANT_TYPE_SIGNATURE"><code class="literal">G_VARIANT_TYPE_SIGNATURE</code></a>.
</p>
<p>
If <em class="parameter"><code>length</code></em> is non-<a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a> then the length of the string (in bytes) is
returned there. For trusted values, this information is already
known. For untrusted values, a <code class="function">strlen()</code> will be performed.
</p>
<p>
It is an error to call this function with a <em class="parameter"><code>value</code></em> of any type
other than those three.
</p>
<p>
The return value remains valid as long as <em class="parameter"><code>value</code></em> exists.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
<td>a string <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>length</code></em> :</span></p></td>
<td>a pointer to a <a class="link" href="glib-Basic-Types.html#gsize" title="gsize"><span class="type">gsize</span></a>, to store the length
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the constant string
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_dup_string ()">
<a name="g-variant-dup-string"></a><h3>g_variant_dup_string ()</h3>
<pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="returnvalue">gchar</span></a> * g_variant_dup_string (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>,
<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gsize" title="gsize"><span class="type">gsize</span></a> *length</code></em>);</pre>
<p>
Similar to <a class="link" href="glib-GVariant.html#g-variant-get-string" title="g_variant_get_string ()"><code class="function">g_variant_get_string()</code></a> except that instead of returning
a constant string, the string is duplicated.
</p>
<p>
The return value must be freed using <a class="link" href="glib-Memory-Allocation.html#g-free" title="g_free ()"><code class="function">g_free()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
<td>a string <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>length</code></em> :</span></p></td>
<td>a pointer to a <a class="link" href="glib-Basic-Types.html#gsize" title="gsize"><span class="type">gsize</span></a>, to store the length
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a newly allocated string
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_get_variant ()">
<a name="g-variant-get-variant"></a><h3>g_variant_get_variant ()</h3>
<pre class="programlisting"><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * g_variant_get_variant (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>);</pre>
<p>
Unboxes <em class="parameter"><code>value</code></em>. The result is the <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance that was
contained in <em class="parameter"><code>value</code></em>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
<td>a variant <span class="type">GVariance</span> instance
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the item contained in the variant
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_get_strv ()">
<a name="g-variant-get-strv"></a><h3>g_variant_get_strv ()</h3>
<pre class="programlisting">const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="returnvalue">gchar</span></a> ** g_variant_get_strv (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>,
<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gsize" title="gsize"><span class="type">gsize</span></a> *length</code></em>);</pre>
<p>
Gets the contents of an array of strings <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a>. This call
makes a shallow copy; the return result should be released with
<a class="link" href="glib-Memory-Allocation.html#g-free" title="g_free ()"><code class="function">g_free()</code></a>, but the individual strings must not be modified.
</p>
<p>
If <em class="parameter"><code>length</code></em> is non-<a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a> then the number of elements in the result
is stored there. In any case, the resulting array will be
<a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>-terminated.
</p>
<p>
For an empty array, <em class="parameter"><code>length</code></em> will be set to 0 and a pointer to a
<a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a> pointer will be returned.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
<td>an array of strings <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>length</code></em> :</span></p></td>
<td>the length of the result, or <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>an array of constant strings
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_dup_strv ()">
<a name="g-variant-dup-strv"></a><h3>g_variant_dup_strv ()</h3>
<pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="returnvalue">gchar</span></a> ** g_variant_dup_strv (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>,
<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gsize" title="gsize"><span class="type">gsize</span></a> *length</code></em>);</pre>
<p>
Gets the contents of an array of strings <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a>. This call
makes a deep copy; the return result should be released with
<a class="link" href="glib-String-Utility-Functions.html#g-strfreev" title="g_strfreev ()"><code class="function">g_strfreev()</code></a>.
</p>
<p>
If <em class="parameter"><code>length</code></em> is non-<a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a> then the number of elements in the result
is stored there. In any case, the resulting array will be
<a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>-terminated.
</p>
<p>
For an empty array, <em class="parameter"><code>length</code></em> will be set to 0 and a pointer to a
<a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a> pointer will be returned.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
<td>an array of strings <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>length</code></em> :</span></p></td>
<td>the length of the result, or <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>an array of constant strings
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_new_maybe ()">
<a name="g-variant-new-maybe"></a><h3>g_variant_new_maybe ()</h3>
<pre class="programlisting"><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * g_variant_new_maybe (<em class="parameter"><code>const <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a> *child_type</code></em>,
<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *child</code></em>);</pre>
<p>
Depending on if <em class="parameter"><code>value</code></em> is <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>, either wraps <em class="parameter"><code>value</code></em> inside of a
maybe container or creates a Nothing instance for the given <em class="parameter"><code>type</code></em>.
</p>
<p>
At least one of <em class="parameter"><code>type</code></em> and <em class="parameter"><code>value</code></em> must be non-<a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>. If <em class="parameter"><code>type</code></em> is
non-<a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a> then it must be a definite type. If they are both
non-<a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a> then <em class="parameter"><code>type</code></em> must be the type of <em class="parameter"><code>value</code></em>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>child_type</code></em> :</span></p></td>
<td>the <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a> of the child
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>child</code></em> :</span></p></td>
<td>the child value, or <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a new <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> maybe instance
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_new_array ()">
<a name="g-variant-new-array"></a><h3>g_variant_new_array ()</h3>
<pre class="programlisting"><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * g_variant_new_array (<em class="parameter"><code>const <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a> *child_type</code></em>,
<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> * const *children</code></em>,
<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gsize" title="gsize"><span class="type">gsize</span></a> n_children</code></em>);</pre>
<p>
Creates a new <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> array from <em class="parameter"><code>children</code></em>.
</p>
<p>
<em class="parameter"><code>child_type</code></em> must be non-<a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a> if <em class="parameter"><code>n_children</code></em> is zero. Otherwise, the
child type is determined by inspecting the first element of the
<em class="parameter"><code>children</code></em> array. If <em class="parameter"><code>child_type</code></em> is non-<a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a> then it must be a
definite type.
</p>
<p>
The items of the array are taken from the <em class="parameter"><code>children</code></em> array. No entry
in the <em class="parameter"><code>children</code></em> array may be <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>.
</p>
<p>
All items in the array must have the same type, which must be the
same as <em class="parameter"><code>child_type</code></em>, if given.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>child_type</code></em> :</span></p></td>
<td>the element type of the new array
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>children</code></em> :</span></p></td>
<td>an array of <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> pointers, the children
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>n_children</code></em> :</span></p></td>
<td>the length of <em class="parameter"><code>children</code></em>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a new <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> array
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_new_tuple ()">
<a name="g-variant-new-tuple"></a><h3>g_variant_new_tuple ()</h3>
<pre class="programlisting"><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * g_variant_new_tuple (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> * const *children</code></em>,
<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gsize" title="gsize"><span class="type">gsize</span></a> n_children</code></em>);</pre>
<p>
Creates a new tuple <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> out of the items in <em class="parameter"><code>children</code></em>. The
type is determined from the types of <em class="parameter"><code>children</code></em>. No entry in the
<em class="parameter"><code>children</code></em> array may be <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>.
</p>
<p>
If <em class="parameter"><code>n_children</code></em> is 0 then the unit tuple is constructed.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>children</code></em> :</span></p></td>
<td>the items to make the tuple out of
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>n_children</code></em> :</span></p></td>
<td>the length of <em class="parameter"><code>children</code></em>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a new <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> tuple
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_new_dict_entry ()">
<a name="g-variant-new-dict-entry"></a><h3>g_variant_new_dict_entry ()</h3>
<pre class="programlisting"><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * g_variant_new_dict_entry (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *key</code></em>,
<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>);</pre>
<p>
Creates a new dictionary entry <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a>. <em class="parameter"><code>key</code></em> and <em class="parameter"><code>value</code></em> must be
non-<a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>.
</p>
<p>
<em class="parameter"><code>key</code></em> must be a value of a basic type (ie: not a container).
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>key</code></em> :</span></p></td>
<td>a basic <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a>, the key
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
<td>a <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a>, the value
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a new dictionary entry <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_get_maybe ()">
<a name="g-variant-get-maybe"></a><h3>g_variant_get_maybe ()</h3>
<pre class="programlisting"><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * g_variant_get_maybe (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>);</pre>
<p>
Given a maybe-typed <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance, extract its value. If the
value is Nothing, then this function returns <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
<td>a maybe-typed value
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the contents of <em class="parameter"><code>value</code></em>, or <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_n_children ()">
<a name="g-variant-n-children"></a><h3>g_variant_n_children ()</h3>
<pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gsize" title="gsize"><span class="returnvalue">gsize</span></a> g_variant_n_children (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>);</pre>
<p>
Determines the number of children in a container <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance.
This includes variants, maybes, arrays, tuples and dictionary
entries. It is an error to call this function on any other type of
<a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a>.
</p>
<p>
For variants, the return value is always 1. For values with maybe
types, it is always zero or one. For arrays, it is the length of the
array. For tuples it is the number of tuple items (which depends
only on the type). For dictionary entries, it is always 2
</p>
<p>
This function is O(1).
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
<td>a container <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the number of children in the container
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_get_child_value ()">
<a name="g-variant-get-child-value"></a><h3>g_variant_get_child_value ()</h3>
<pre class="programlisting"><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * g_variant_get_child_value (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>,
<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gsize" title="gsize"><span class="type">gsize</span></a> index_</code></em>);</pre>
<p>
Reads a child item out of a container <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance. This
includes variants, maybes, arrays, tuples and dictionary
entries. It is an error to call this function on any other type of
<a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a>.
</p>
<p>
It is an error if <em class="parameter"><code>index_</code></em> is greater than the number of child items
in the container. See <a class="link" href="glib-GVariant.html#g-variant-n-children" title="g_variant_n_children ()"><code class="function">g_variant_n_children()</code></a>.
</p>
<p>
This function is O(1).
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
<td>a container <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>index_</code></em> :</span></p></td>
<td>the index of the child to fetch
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the child at the specified index
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_get_child ()">
<a name="g-variant-get-child"></a><h3>g_variant_get_child ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> g_variant_get_child (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>,
<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gsize" title="gsize"><span class="type">gsize</span></a> index_</code></em>,
<em class="parameter"><code>const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="type">gchar</span></a> *format_string</code></em>,
<em class="parameter"><code>...</code></em>);</pre>
<p>
Reads a child item out of a container <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance and
deconstructs it according to <em class="parameter"><code>format_string</code></em>. This call is
essentially a combination of <a class="link" href="glib-GVariant.html#g-variant-get-child-value" title="g_variant_get_child_value ()"><code class="function">g_variant_get_child_value()</code></a> and
<a class="link" href="glib-GVariant.html#g-variant-get" title="g_variant_get ()"><code class="function">g_variant_get()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
<td>a container <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>index_</code></em> :</span></p></td>
<td>the index of the child to deconstruct
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>format_string</code></em> :</span></p></td>
<td>a <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> format string
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>...</code></em> :</span></p></td>
<td>arguments, as per <em class="parameter"><code>format_string</code></em>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_get_fixed_array ()">
<a name="g-variant-get-fixed-array"></a><h3>g_variant_get_fixed_array ()</h3>
<pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gconstpointer" title="gconstpointer"><span class="returnvalue">gconstpointer</span></a> g_variant_get_fixed_array (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>,
<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gsize" title="gsize"><span class="type">gsize</span></a> *n_elements</code></em>,
<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gsize" title="gsize"><span class="type">gsize</span></a> element_size</code></em>);</pre>
<p>
Provides access to the serialised data for an array of fixed-sized
items.
</p>
<p>
<em class="parameter"><code>value</code></em> must be an array with fixed-sized elements. Numeric types are
fixed-size as are tuples containing only other fixed-sized types.
</p>
<p>
<em class="parameter"><code>element_size</code></em> must be the size of a single element in the array. For
example, if calling this function for an array of 32 bit integers,
you might say <code class="code">sizeof (gint32)</code>. This value isn't used
except for the purpose of a double-check that the form of the
seralised data matches the caller's expectation.
</p>
<p>
<em class="parameter"><code>n_elements</code></em>, which must be non-<a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a> is set equal to the number of
items in the array.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
<td>a <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> array with fixed-sized elements
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>n_elements</code></em> :</span></p></td>
<td>a pointer to the location to store the number of items
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>element_size</code></em> :</span></p></td>
<td>the size of each element
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a pointer to the fixed array
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_get_size ()">
<a name="g-variant-get-size"></a><h3>g_variant_get_size ()</h3>
<pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gsize" title="gsize"><span class="returnvalue">gsize</span></a> g_variant_get_size (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>);</pre>
<p>
Determines the number of bytes that would be required to store <em class="parameter"><code>value</code></em>
with <a class="link" href="glib-GVariant.html#g-variant-store" title="g_variant_store ()"><code class="function">g_variant_store()</code></a>.
</p>
<p>
If <em class="parameter"><code>value</code></em> has a fixed-sized type then this function always returned
that fixed size.
</p>
<p>
In the case that <em class="parameter"><code>value</code></em> is already in serialised form or the size has
already been calculated (ie: this function has been called before)
then this function is O(1). Otherwise, the size is calculated, an
operation which is approximately O(n) in the number of values
involved.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
<td>a <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the serialised size of <em class="parameter"><code>value</code></em>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_get_data ()">
<a name="g-variant-get-data"></a><h3>g_variant_get_data ()</h3>
<pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gconstpointer" title="gconstpointer"><span class="returnvalue">gconstpointer</span></a> g_variant_get_data (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>);</pre>
<p>
Returns a pointer to the serialised form of a <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance.
The returned data may not be in fully-normalised form if read from an
untrusted source. The returned data must not be freed; it remains
valid for as long as <em class="parameter"><code>value</code></em> exists.
</p>
<p>
If <em class="parameter"><code>value</code></em> is a fixed-sized value that was deserialised from a
corrupted serialised container then <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a> may be returned. In this
case, the proper thing to do is typically to use the appropriate
number of nul bytes in place of <em class="parameter"><code>value</code></em>. If <em class="parameter"><code>value</code></em> is not fixed-sized
then <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a> is never returned.
</p>
<p>
In the case that <em class="parameter"><code>value</code></em> is already in serialised form, this function
is O(1). If the value is not already in serialised form,
serialisation occurs implicitly and is approximately O(n) in the size
of the result.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
<td>a <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the serialised form of <em class="parameter"><code>value</code></em>, or <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_store ()">
<a name="g-variant-store"></a><h3>g_variant_store ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> g_variant_store (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>,
<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gpointer" title="gpointer"><span class="type">gpointer</span></a> data</code></em>);</pre>
<p>
Stores the serialised form of <em class="parameter"><code>value</code></em> at <em class="parameter"><code>data</code></em>. <em class="parameter"><code>data</code></em> should be
large enough. See <a class="link" href="glib-GVariant.html#g-variant-get-size" title="g_variant_get_size ()"><code class="function">g_variant_get_size()</code></a>.
</p>
<p>
The stored data is in machine native byte order but may not be in
fully-normalised form if read from an untrusted source. See
<code class="function">g_variant_normalise()</code> for a solution.
</p>
<p>
This function is approximately O(n) in the size of <em class="parameter"><code>data</code></em>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
<td>the <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> to store
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>data</code></em> :</span></p></td>
<td>the location to store the serialised data at
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_new_from_data ()">
<a name="g-variant-new-from-data"></a><h3>g_variant_new_from_data ()</h3>
<pre class="programlisting"><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * g_variant_new_from_data (<em class="parameter"><code>const <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a> *type</code></em>,
<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gconstpointer" title="gconstpointer"><span class="type">gconstpointer</span></a> data</code></em>,
<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gsize" title="gsize"><span class="type">gsize</span></a> size</code></em>,
<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="type">gboolean</span></a> trusted</code></em>,
<em class="parameter"><code><a class="link" href="glib-Datasets.html#GDestroyNotify" title="GDestroyNotify ()"><span class="type">GDestroyNotify</span></a> notify</code></em>,
<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gpointer" title="gpointer"><span class="type">gpointer</span></a> user_data</code></em>);</pre>
<p>
Creates a new <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance from serialised data.
</p>
<p>
<em class="parameter"><code>type</code></em> is the type of <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance that will be constructed.
The interpretation of <em class="parameter"><code>data</code></em> depends on knowing the type.
</p>
<p>
<em class="parameter"><code>data</code></em> is not modified by this function and must remain valid with an
unchanging value until such a time as <em class="parameter"><code>notify</code></em> is called with
<em class="parameter"><code>user_data</code></em>. If the contents of <em class="parameter"><code>data</code></em> change before that time then
the result is undefined.
</p>
<p>
If <em class="parameter"><code>data</code></em> is trusted to be serialised data in normal form then
<em class="parameter"><code>trusted</code></em> should be <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a>. This applies to serialised data created
within this process or read from a trusted location on the disk (such
as a file installed in /usr/lib alongside your application). You
should set trusted to <a class="link" href="glib-Standard-Macros.html#FALSE:CAPS" title="FALSE"><code class="literal">FALSE</code></a> if <em class="parameter"><code>data</code></em> is read from the network, a
file in the user's home directory, etc.
</p>
<p>
<em class="parameter"><code>notify</code></em> will be called with <em class="parameter"><code>user_data</code></em> when <em class="parameter"><code>data</code></em> is no longer
needed. The exact time of this call is unspecified and might even be
before this function returns.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>type</code></em> :</span></p></td>
<td>a definite <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>data</code></em> :</span></p></td>
<td>the serialised data
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>size</code></em> :</span></p></td>
<td>the size of <em class="parameter"><code>data</code></em>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>trusted</code></em> :</span></p></td>
<td>
<a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> if <em class="parameter"><code>data</code></em> is definitely in normal form
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>notify</code></em> :</span></p></td>
<td>function to call when <em class="parameter"><code>data</code></em> is no longer needed
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>data for <em class="parameter"><code>notify</code></em>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a new floating <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> of type <em class="parameter"><code>type</code></em>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_byteswap ()">
<a name="g-variant-byteswap"></a><h3>g_variant_byteswap ()</h3>
<pre class="programlisting"><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * g_variant_byteswap (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>);</pre>
<p>
Performs a byteswapping operation on the contents of <em class="parameter"><code>value</code></em>. The
result is that all multi-byte numeric data contained in <em class="parameter"><code>value</code></em> is
byteswapped. That includes 16, 32, and 64bit signed and unsigned
integers as well as file handles and double precision floating point
values.
</p>
<p>
This function is an identity mapping on any value that does not
contain multi-byte numeric data. That include strings, booleans,
bytes and containers containing only these things (recursively).
</p>
<p>
The returned value is always in normal form and is marked as trusted.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
<td>a <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the byteswapped form of <em class="parameter"><code>value</code></em>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_get_normal_form ()">
<a name="g-variant-get-normal-form"></a><h3>g_variant_get_normal_form ()</h3>
<pre class="programlisting"><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * g_variant_get_normal_form (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>);</pre>
<p>
Gets a <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance that has the same value as <em class="parameter"><code>value</code></em> and is
trusted to be in normal form.
</p>
<p>
If <em class="parameter"><code>value</code></em> is already trusted to be in normal form then a new
reference to <em class="parameter"><code>value</code></em> is returned.
</p>
<p>
If <em class="parameter"><code>value</code></em> is not already trusted, then it is scanned to check if it
is in normal form. If it is found to be in normal form then it is
marked as trusted and a new reference to it is returned.
</p>
<p>
If <em class="parameter"><code>value</code></em> is found not to be in normal form then a new trusted
<a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> is created with the same value as <em class="parameter"><code>value</code></em>.
</p>
<p>
It makes sense to call this function if you've received <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a>
data from untrusted sources and you want to ensure your serialised
output is definitely in normal form.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
<td>a <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a trusted <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_is_normal_form ()">
<a name="g-variant-is-normal-form"></a><h3>g_variant_is_normal_form ()</h3>
<pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a> g_variant_is_normal_form (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>);</pre>
<p>
Checks if <em class="parameter"><code>value</code></em> is in normal form.
</p>
<p>
The main reason to do this is to detect if a given chunk of
serialised data is in normal form: load the data into a <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a>
using <code class="function">g_variant_create_from_data()</code> and then use this function to
check.
</p>
<p>
If <em class="parameter"><code>value</code></em> is found to be in normal form then it will be marked as
being trusted. If the value was already marked as being trusted then
this function will immediately return <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
<td>a <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> if <em class="parameter"><code>value</code></em> is in normal form
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_hash ()">
<a name="g-variant-hash"></a><h3>g_variant_hash ()</h3>
<pre class="programlisting"><a class="link" href="glib-Basic-Types.html#guint" title="guint"><span class="returnvalue">guint</span></a> g_variant_hash (<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gconstpointer" title="gconstpointer"><span class="type">gconstpointer</span></a> value</code></em>);</pre>
<p>
Generates a hash value for a <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance.
</p>
<p>
The output of this function is guaranteed to be the same for a given
value only per-process. It may change between different processor
architectures or even different versions of GLib. Do not use this
function as a basis for building protocols or file formats.
</p>
<p>
The type of <em class="parameter"><code>value</code></em> is <a class="link" href="glib-Basic-Types.html#gconstpointer" title="gconstpointer"><span class="type">gconstpointer</span></a> only to allow use of this
function with <a class="link" href="glib-Hash-Tables.html#GHashTable" title="GHashTable"><span class="type">GHashTable</span></a>. <em class="parameter"><code>value</code></em> must be a <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
<td>a basic <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> value as a <a class="link" href="glib-Basic-Types.html#gconstpointer" title="gconstpointer"><span class="type">gconstpointer</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a hash value corresponding to <em class="parameter"><code>value</code></em>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_equal ()">
<a name="g-variant-equal"></a><h3>g_variant_equal ()</h3>
<pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a> g_variant_equal (<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gconstpointer" title="gconstpointer"><span class="type">gconstpointer</span></a> one</code></em>,
<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gconstpointer" title="gconstpointer"><span class="type">gconstpointer</span></a> two</code></em>);</pre>
<p>
Checks if <em class="parameter"><code>one</code></em> and <em class="parameter"><code>two</code></em> have the same type and value.
</p>
<p>
The types of <em class="parameter"><code>one</code></em> and <em class="parameter"><code>two</code></em> are <a class="link" href="glib-Basic-Types.html#gconstpointer" title="gconstpointer"><span class="type">gconstpointer</span></a> only to allow use of
this function with <a class="link" href="glib-Hash-Tables.html#GHashTable" title="GHashTable"><span class="type">GHashTable</span></a>. They must each be a <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>one</code></em> :</span></p></td>
<td>a <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>two</code></em> :</span></p></td>
<td>a <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> if <em class="parameter"><code>one</code></em> and <em class="parameter"><code>two</code></em> are equal
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_print ()">
<a name="g-variant-print"></a><h3>g_variant_print ()</h3>
<pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="returnvalue">gchar</span></a> * g_variant_print (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>,
<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="type">gboolean</span></a> type_annotate</code></em>);</pre>
<p>
Pretty-prints <em class="parameter"><code>value</code></em> in the format understood by <a class="link" href="glib-GVariant.html#g-variant-parse" title="g_variant_parse ()"><code class="function">g_variant_parse()</code></a>.
</p>
<p>
If <em class="parameter"><code>type_annotate</code></em> is <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a>, then type information is included in
the output.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
<td>a <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>type_annotate</code></em> :</span></p></td>
<td>
<a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> if type information should be included in
the output
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a newly-allocated string holding the result.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="g_variant_print_string ()">
<a name="g-variant-print-string"></a><h3>g_variant_print_string ()</h3>
<pre class="programlisting"><a class="link" href="glib-Strings.html#GString" title="GString"><span class="returnvalue">GString</span></a> * g_variant_print_string (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>,
<em class="parameter"><code><a class="link" href="glib-Strings.html#GString" title="GString"><span class="type">GString</span></a> *string</code></em>,
<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="type">gboolean</span></a> type_annotate</code></em>);</pre>
<p>
Behaves as <a class="link" href="glib-GVariant.html#g-variant-print" title="g_variant_print ()"><code class="function">g_variant_print()</code></a>, but operates on a <a class="link" href="glib-Strings.html#GString" title="GString"><span class="type">GString</span></a>.
</p>
<p>
If <em class="parameter"><code>string</code></em> is non-<a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a> then it is appended to and returned. Else,
a new empty <a class="link" href="glib-Strings.html#GString" title="GString"><span class="type">GString</span></a> is allocated and it is returned.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
<td>a <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>string</code></em> :</span></p></td>
<td>a <a class="link" href="glib-Strings.html#GString" title="GString"><span class="type">GString</span></a>, or <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>type_annotate</code></em> :</span></p></td>
<td>
<a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> if type information should be included in
the output
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a <a class="link" href="glib-Strings.html#GString" title="GString"><span class="type">GString</span></a> containing the string
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="GVariantIter">
<a name="GVariantIter"></a><h3>GVariantIter</h3>
<pre class="programlisting">typedef struct {
} GVariantIter;
</pre>
<p>
<a class="link" href="glib-GVariant.html#GVariantIter" title="GVariantIter"><span class="type">GVariantIter</span></a> is an opaque data structure and can only be accessed
using the following functions.
</p>
</div>
<hr>
<div class="refsect2" title="g_variant_iter_copy ()">
<a name="g-variant-iter-copy"></a><h3>g_variant_iter_copy ()</h3>
<pre class="programlisting"><a class="link" href="glib-GVariant.html#GVariantIter" title="GVariantIter"><span class="returnvalue">GVariantIter</span></a> * g_variant_iter_copy (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariantIter" title="GVariantIter"><span class="type">GVariantIter</span></a> *iter</code></em>);</pre>
<p>
Creates a new heap-allocated <a class="link" href="glib-GVariant.html#GVariantIter" title="GVariantIter"><span class="type">GVariantIter</span></a> to iterate over the
container that was being iterated over by <em class="parameter"><code>iter</code></em>. Iteration begins on
the new iterator from the current position of the old iterator but
the two copies are independent past that point.
</p>
<p>
Use <a class="link" href="glib-GVariant.html#g-variant-iter-free" title="g_variant_iter_free ()"><code class="function">g_variant_iter_free()</code></a> to free the return value when you no longer
need it.
</p>
<p>
A reference is taken to the container that <em class="parameter"><code>iter</code></em> is iterating over
and will be releated only when <a class="link" href="glib-GVariant.html#g-variant-iter-free" title="g_variant_iter_free ()"><code class="function">g_variant_iter_free()</code></a> is called.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>iter</code></em> :</span></p></td>
<td>a <a class="link" href="glib-GVariant.html#GVariantIter" title="GVariantIter"><span class="type">GVariantIter</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a new heap-allocated <a class="link" href="glib-GVariant.html#GVariantIter" title="GVariantIter"><span class="type">GVariantIter</span></a>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_iter_free ()">
<a name="g-variant-iter-free"></a><h3>g_variant_iter_free ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> g_variant_iter_free (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariantIter" title="GVariantIter"><span class="type">GVariantIter</span></a> *iter</code></em>);</pre>
<p>
Frees a heap-allocated <a class="link" href="glib-GVariant.html#GVariantIter" title="GVariantIter"><span class="type">GVariantIter</span></a>. Only call this function on
iterators that were returned by <a class="link" href="glib-GVariant.html#g-variant-iter-new" title="g_variant_iter_new ()"><code class="function">g_variant_iter_new()</code></a> or
<a class="link" href="glib-GVariant.html#g-variant-iter-copy" title="g_variant_iter_copy ()"><code class="function">g_variant_iter_copy()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>iter</code></em> :</span></p></td>
<td>a heap-allocated <a class="link" href="glib-GVariant.html#GVariantIter" title="GVariantIter"><span class="type">GVariantIter</span></a>
</td>
</tr></tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_iter_init ()">
<a name="g-variant-iter-init"></a><h3>g_variant_iter_init ()</h3>
<pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gsize" title="gsize"><span class="returnvalue">gsize</span></a> g_variant_iter_init (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariantIter" title="GVariantIter"><span class="type">GVariantIter</span></a> *iter</code></em>,
<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>);</pre>
<p>
Initialises (without allocating) a <a class="link" href="glib-GVariant.html#GVariantIter" title="GVariantIter"><span class="type">GVariantIter</span></a>. <em class="parameter"><code>iter</code></em> may be
completely uninitialised prior to this call; its old value is
ignored.
</p>
<p>
The iterator remains valid for as long as <em class="parameter"><code>value</code></em> exists, and need not
be freed in any way.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>iter</code></em> :</span></p></td>
<td>a pointer to a <a class="link" href="glib-GVariant.html#GVariantIter" title="GVariantIter"><span class="type">GVariantIter</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
<td>a container <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the number of items in <em class="parameter"><code>value</code></em>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_iter_n_children ()">
<a name="g-variant-iter-n-children"></a><h3>g_variant_iter_n_children ()</h3>
<pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gsize" title="gsize"><span class="returnvalue">gsize</span></a> g_variant_iter_n_children (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariantIter" title="GVariantIter"><span class="type">GVariantIter</span></a> *iter</code></em>);</pre>
<p>
Queries the number of child items in the container that we are
iterating over. This is the total number of items -- not the number
of items remaining.
</p>
<p>
This function might be useful for preallocation of arrays.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>iter</code></em> :</span></p></td>
<td>a <a class="link" href="glib-GVariant.html#GVariantIter" title="GVariantIter"><span class="type">GVariantIter</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the number of children in the container
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_iter_new ()">
<a name="g-variant-iter-new"></a><h3>g_variant_iter_new ()</h3>
<pre class="programlisting"><a class="link" href="glib-GVariant.html#GVariantIter" title="GVariantIter"><span class="returnvalue">GVariantIter</span></a> * g_variant_iter_new (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>);</pre>
<p>
Creates a heap-allocated <a class="link" href="glib-GVariant.html#GVariantIter" title="GVariantIter"><span class="type">GVariantIter</span></a> for iterating over the items
in <em class="parameter"><code>value</code></em>.
</p>
<p>
Use <a class="link" href="glib-GVariant.html#g-variant-iter-free" title="g_variant_iter_free ()"><code class="function">g_variant_iter_free()</code></a> to free the return value when you no longer
need it.
</p>
<p>
A reference is taken to <em class="parameter"><code>value</code></em> and will be released only when
<a class="link" href="glib-GVariant.html#g-variant-iter-free" title="g_variant_iter_free ()"><code class="function">g_variant_iter_free()</code></a> is called.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
<td>a container <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a new heap-allocated <a class="link" href="glib-GVariant.html#GVariantIter" title="GVariantIter"><span class="type">GVariantIter</span></a>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_iter_next_value ()">
<a name="g-variant-iter-next-value"></a><h3>g_variant_iter_next_value ()</h3>
<pre class="programlisting"><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * g_variant_iter_next_value (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariantIter" title="GVariantIter"><span class="type">GVariantIter</span></a> *iter</code></em>);</pre>
<p>
Gets the next item in the container. If no more items remain then
<a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a> is returned.
</p>
<p>
Use <a class="link" href="glib-GVariant.html#g-variant-unref" title="g_variant_unref ()"><code class="function">g_variant_unref()</code></a> to drop your reference on the return value when
you no longer need it.
</p>
<p>
</p>
<div class="example">
<a name="id885269"></a><p class="title"><b>Example 23. Iterating with <a class="link" href="glib-GVariant.html#g-variant-iter-next-value" title="g_variant_iter_next_value ()"><code class="function">g_variant_iter_next_value()</code></a></b></p>
<div class="example-contents">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td class="listing_lines" align="right"><pre>1
2
3
4
5
6
7
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9
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11
12
13
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16
17
18</pre></td>
<td class="listing_code"><pre class="programlisting"><span class="comment">/* recursively iterate a container */</span>
<span class="type">void</span>
<span class="function">iterate_container_recursive</span><span class="normal"> </span><span class="symbol">(</span><span class="normal"><a href="glib-GVariant.html#GVariant">GVariant</a> </span><span class="symbol">*</span><span class="normal">container</span><span class="symbol">)</span>
<span class="cbracket">{</span>
<span class="normal"> <a href="glib-GVariant.html#GVariantIter">GVariantIter</a> iter</span><span class="symbol">;</span>
<span class="normal"> <a href="glib-GVariant.html#GVariant">GVariant</a> </span><span class="symbol">*</span><span class="normal">child</span><span class="symbol">;</span>
<span class="normal"> </span><span class="function"><a href="glib-GVariant.html#g-variant-iter-init">g_variant_iter_init</a></span><span class="normal"> </span><span class="symbol">(&amp;</span><span class="normal">iter</span><span class="symbol">,</span><span class="normal"> dictionary</span><span class="symbol">);</span>
<span class="normal"> </span><span class="keyword">while</span><span class="normal"> </span><span class="symbol">((</span><span class="normal">child </span><span class="symbol">=</span><span class="normal"> </span><span class="function"><a href="glib-GVariant.html#g-variant-iter-next-value">g_variant_iter_next_value</a></span><span class="normal"> </span><span class="symbol">(&amp;</span><span class="normal">iter</span><span class="symbol">)))</span>
<span class="normal"> </span><span class="cbracket">{</span>
<span class="normal"> </span><span class="function"><a href="glib-Warnings-and-Assertions.html#g-print">g_print</a></span><span class="normal"> </span><span class="symbol">(</span><span class="string">"type '%s'</span><span class="specialchar">\n</span><span class="string">"</span><span class="symbol">,</span><span class="normal"> </span><span class="function"><a href="glib-GVariant.html#g-variant-get-type-string">g_variant_get_type_string</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">child</span><span class="symbol">));</span>
<span class="normal"> </span><span class="keyword">if</span><span class="normal"> </span><span class="symbol">(</span><span class="function"><a href="glib-GVariant.html#g-variant-is-container">g_variant_is_container</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">child</span><span class="symbol">))</span>
<span class="normal"> </span><span class="function">iterate_container_recursive</span><span class="normal"> </span><span class="symbol">(</span><span class="normal">child</span><span class="symbol">);</span>
<span class="normal"> </span><span class="function"><a href="glib-GVariant.html#g-variant-unref">g_variant_unref</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">child</span><span class="symbol">);</span>
<span class="normal"> </span><span class="cbracket">}</span>
<span class="cbracket">}</span></pre></td>
</tr>
</tbody>
</table>
</div>
</div>
<p><br class="example-break">
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>iter</code></em> :</span></p></td>
<td>a <a class="link" href="glib-GVariant.html#GVariantIter" title="GVariantIter"><span class="type">GVariantIter</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a>, or <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_iter_next ()">
<a name="g-variant-iter-next"></a><h3>g_variant_iter_next ()</h3>
<pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a> g_variant_iter_next (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariantIter" title="GVariantIter"><span class="type">GVariantIter</span></a> *iter</code></em>,
<em class="parameter"><code>const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="type">gchar</span></a> *format_string</code></em>,
<em class="parameter"><code>...</code></em>);</pre>
<p>
Gets the next item in the container and unpacks it into the variable
argument list according to <em class="parameter"><code>format_string</code></em>, returning <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a>.
</p>
<p>
If no more items remain then <a class="link" href="glib-Standard-Macros.html#FALSE:CAPS" title="FALSE"><code class="literal">FALSE</code></a> is returned.
</p>
<p>
All of the pointers given on the variable arguments list of this
function are assumed to point at uninitialised memory. It is the
responsibility of the caller to free all of the values returned by
the unpacking process.
</p>
<p>
</p>
<div class="example">
<a name="id885485"></a><p class="title"><b>Example 24. Memory management with <a class="link" href="glib-GVariant.html#g-variant-iter-next" title="g_variant_iter_next ()"><code class="function">g_variant_iter_next()</code></a></b></p>
<div class="example-contents">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td class="listing_lines" align="right"><pre>1
2
3
4
5
6
7
8
9
10
11
12
13
14
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19</pre></td>
<td class="listing_code"><pre class="programlisting"><span class="comment">/* Iterates a dictionary of type 'a{sv}' */</span>
<span class="type">void</span>
<span class="function">iterate_dictionary</span><span class="normal"> </span><span class="symbol">(</span><span class="normal"><a href="glib-GVariant.html#GVariant">GVariant</a> </span><span class="symbol">*</span><span class="normal">dictionary</span><span class="symbol">)</span>
<span class="cbracket">{</span>
<span class="normal"> <a href="glib-GVariant.html#GVariantIter">GVariantIter</a> iter</span><span class="symbol">;</span>
<span class="normal"> <a href="glib-GVariant.html#GVariant">GVariant</a> </span><span class="symbol">*</span><span class="normal">value</span><span class="symbol">;</span>
<span class="normal"> <a href="glib-Basic-Types.html#gchar">gchar</a> </span><span class="symbol">*</span><span class="normal">key</span><span class="symbol">;</span>
<span class="normal"> </span><span class="function"><a href="glib-GVariant.html#g-variant-iter-init">g_variant_iter_init</a></span><span class="normal"> </span><span class="symbol">(&amp;</span><span class="normal">iter</span><span class="symbol">,</span><span class="normal"> dictionary</span><span class="symbol">);</span>
<span class="normal"> </span><span class="keyword">while</span><span class="normal"> </span><span class="symbol">(</span><span class="function"><a href="glib-GVariant.html#g-variant-iter-next">g_variant_iter_next</a></span><span class="normal"> </span><span class="symbol">(&amp;</span><span class="normal">iter</span><span class="symbol">,</span><span class="normal"> </span><span class="string">"{sv}"</span><span class="symbol">,</span><span class="normal"> </span><span class="symbol">&amp;</span><span class="normal">key</span><span class="symbol">,</span><span class="normal"> </span><span class="symbol">&amp;</span><span class="normal">value</span><span class="symbol">))</span>
<span class="normal"> </span><span class="cbracket">{</span>
<span class="normal"> </span><span class="function"><a href="glib-Warnings-and-Assertions.html#g-print">g_print</a></span><span class="normal"> </span><span class="symbol">(</span><span class="string">"Item '%s' has type '%s'</span><span class="specialchar">\n</span><span class="string">"</span><span class="symbol">,</span><span class="normal"> key</span><span class="symbol">,</span>
<span class="normal"> </span><span class="function"><a href="glib-GVariant.html#g-variant-get-type-string">g_variant_get_type_string</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">value</span><span class="symbol">));</span>
<span class="normal"> </span><span class="comment">/* must free data for ourselves */</span>
<span class="normal"> </span><span class="function"><a href="glib-GVariant.html#g-variant-unref">g_variant_unref</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">value</span><span class="symbol">);</span>
<span class="normal"> </span><span class="function"><a href="glib-Memory-Allocation.html#g-free">g_free</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">key</span><span class="symbol">);</span>
<span class="normal"> </span><span class="cbracket">}</span>
<span class="cbracket">}</span></pre></td>
</tr>
</tbody>
</table>
</div>
</div>
<p><br class="example-break">
</p>
<p>
For a solution that is likely to be more convenient to C programmers
when dealing with loops, see <a class="link" href="glib-GVariant.html#g-variant-iter-loop" title="g_variant_iter_loop ()"><code class="function">g_variant_iter_loop()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>iter</code></em> :</span></p></td>
<td>a <a class="link" href="glib-GVariant.html#GVariantIter" title="GVariantIter"><span class="type">GVariantIter</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>format_string</code></em> :</span></p></td>
<td>a GVariant format string
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>...</code></em> :</span></p></td>
<td>the arguments to unpack the value into
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> if a value was unpacked, or <a class="link" href="glib-Standard-Macros.html#FALSE:CAPS" title="FALSE"><code class="literal">FALSE</code></a> if there as no
value
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_iter_loop ()">
<a name="g-variant-iter-loop"></a><h3>g_variant_iter_loop ()</h3>
<pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a> g_variant_iter_loop (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariantIter" title="GVariantIter"><span class="type">GVariantIter</span></a> *iter</code></em>,
<em class="parameter"><code>const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="type">gchar</span></a> *format_string</code></em>,
<em class="parameter"><code>...</code></em>);</pre>
<p>
Gets the next item in the container and unpacks it into the variable
argument list according to <em class="parameter"><code>format_string</code></em>, returning <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a>.
</p>
<p>
If no more items remain then <a class="link" href="glib-Standard-Macros.html#FALSE:CAPS" title="FALSE"><code class="literal">FALSE</code></a> is returned.
</p>
<p>
On the first call to this function, the pointers appearing on the
variable argument list are assumed to point at uninitialised memory.
On the second and later calls, it is assumed that the same pointers
will be given and that they will point to the memory as set by the
previous call to this function. This allows the previous values to
be freed, as appropriate.
</p>
<p>
This function is intended to be used with a while loop as
demonstrated in the following example. This function can only be
used when iterating over an array. It is only valid to call this
function with a string constant for the format string and the same
string constant must be used each time. Mixing calls to this
function and <a class="link" href="glib-GVariant.html#g-variant-iter-next" title="g_variant_iter_next ()"><code class="function">g_variant_iter_next()</code></a> or <a class="link" href="glib-GVariant.html#g-variant-iter-next-value" title="g_variant_iter_next_value ()"><code class="function">g_variant_iter_next_value()</code></a> on
the same iterator is not recommended.
</p>
<p>
</p>
<div class="example">
<a name="id885784"></a><p class="title"><b>Example 25. Memory management with <a class="link" href="glib-GVariant.html#g-variant-iter-loop" title="g_variant_iter_loop ()"><code class="function">g_variant_iter_loop()</code></a></b></p>
<div class="example-contents">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td class="listing_lines" align="right"><pre>1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17</pre></td>
<td class="listing_code"><pre class="programlisting"><span class="comment">/* Iterates a dictionary of type 'a{sv}' */</span>
<span class="type">void</span>
<span class="function">iterate_dictionary</span><span class="normal"> </span><span class="symbol">(</span><span class="normal"><a href="glib-GVariant.html#GVariant">GVariant</a> </span><span class="symbol">*</span><span class="normal">dictionary</span><span class="symbol">)</span>
<span class="cbracket">{</span>
<span class="normal"> <a href="glib-GVariant.html#GVariantIter">GVariantIter</a> iter</span><span class="symbol">;</span>
<span class="normal"> <a href="glib-GVariant.html#GVariant">GVariant</a> </span><span class="symbol">*</span><span class="normal">value</span><span class="symbol">;</span>
<span class="normal"> <a href="glib-Basic-Types.html#gchar">gchar</a> </span><span class="symbol">*</span><span class="normal">key</span><span class="symbol">;</span>
<span class="normal"> </span><span class="function"><a href="glib-GVariant.html#g-variant-iter-init">g_variant_iter_init</a></span><span class="normal"> </span><span class="symbol">(&amp;</span><span class="normal">iter</span><span class="symbol">,</span><span class="normal"> dictionary</span><span class="symbol">);</span>
<span class="normal"> </span><span class="keyword">while</span><span class="normal"> </span><span class="symbol">(</span><span class="function"><a href="glib-GVariant.html#g-variant-iter-loop">g_variant_iter_loop</a></span><span class="normal"> </span><span class="symbol">(&amp;</span><span class="normal">iter</span><span class="symbol">,</span><span class="normal"> </span><span class="string">"{sv}"</span><span class="symbol">,</span><span class="normal"> </span><span class="symbol">&amp;</span><span class="normal">key</span><span class="symbol">,</span><span class="normal"> </span><span class="symbol">&amp;</span><span class="normal">value</span><span class="symbol">))</span>
<span class="normal"> </span><span class="cbracket">{</span>
<span class="normal"> </span><span class="function"><a href="glib-Warnings-and-Assertions.html#g-print">g_print</a></span><span class="normal"> </span><span class="symbol">(</span><span class="string">"Item '%s' has type '%s'</span><span class="specialchar">\n</span><span class="string">"</span><span class="symbol">,</span><span class="normal"> key</span><span class="symbol">,</span>
<span class="normal"> </span><span class="function"><a href="glib-GVariant.html#g-variant-get-type-string">g_variant_get_type_string</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">value</span><span class="symbol">));</span>
<span class="normal"> </span><span class="comment">/* no need to free 'key' and 'value' here */</span>
<span class="normal"> </span><span class="cbracket">}</span>
<span class="cbracket">}</span></pre></td>
</tr>
</tbody>
</table>
</div>
</div>
<p><br class="example-break">
</p>
<p>
If you want a slightly less magical alternative that requires more
typing, see <a class="link" href="glib-GVariant.html#g-variant-iter-next" title="g_variant_iter_next ()"><code class="function">g_variant_iter_next()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>iter</code></em> :</span></p></td>
<td>a <a class="link" href="glib-GVariant.html#GVariantIter" title="GVariantIter"><span class="type">GVariantIter</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>format_string</code></em> :</span></p></td>
<td>a GVariant format string
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>...</code></em> :</span></p></td>
<td>the arguments to unpack the value into
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> if a value was unpacked, or <a class="link" href="glib-Standard-Macros.html#FALSE:CAPS" title="FALSE"><code class="literal">FALSE</code></a> if there as no
value
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="GVariantBuilder">
<a name="GVariantBuilder"></a><h3>GVariantBuilder</h3>
<pre class="programlisting">typedef struct {
} GVariantBuilder;
</pre>
<p>
A utility type for constructing container-type <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instances.
</p>
<p>
This is an opaque structure and may only be accessed using the
following functions.
</p>
<p>
<a class="link" href="glib-GVariant.html#GVariantBuilder" title="GVariantBuilder"><span class="type">GVariantBuilder</span></a> is not threadsafe in any way. Do not attempt to
access it from more than one thread.
</p>
</div>
<hr>
<div class="refsect2" title="g_variant_builder_unref ()">
<a name="g-variant-builder-unref"></a><h3>g_variant_builder_unref ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> g_variant_builder_unref (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariantBuilder" title="GVariantBuilder"><span class="type">GVariantBuilder</span></a> *builder</code></em>);</pre>
<p>
Decreases the reference count on <em class="parameter"><code>builder</code></em>.
</p>
<p>
In the event that there are no more references, releases all memory
associated with the <a class="link" href="glib-GVariant.html#GVariantBuilder" title="GVariantBuilder"><span class="type">GVariantBuilder</span></a>.
</p>
<p>
Don't call this on stack-allocated <a class="link" href="glib-GVariant.html#GVariantBuilder" title="GVariantBuilder"><span class="type">GVariantBuilder</span></a> instances or bad
things will happen.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>builder</code></em> :</span></p></td>
<td>a <a class="link" href="glib-GVariant.html#GVariantBuilder" title="GVariantBuilder"><span class="type">GVariantBuilder</span></a> allocated by <a class="link" href="glib-GVariant.html#g-variant-builder-new" title="g_variant_builder_new ()"><code class="function">g_variant_builder_new()</code></a>
</td>
</tr></tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_builder_ref ()">
<a name="g-variant-builder-ref"></a><h3>g_variant_builder_ref ()</h3>
<pre class="programlisting"><a class="link" href="glib-GVariant.html#GVariantBuilder" title="GVariantBuilder"><span class="returnvalue">GVariantBuilder</span></a> * g_variant_builder_ref (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariantBuilder" title="GVariantBuilder"><span class="type">GVariantBuilder</span></a> *builder</code></em>);</pre>
<p>
Increases the reference count on <em class="parameter"><code>builder</code></em>.
</p>
<p>
Don't call this on stack-allocated <a class="link" href="glib-GVariant.html#GVariantBuilder" title="GVariantBuilder"><span class="type">GVariantBuilder</span></a> instances or bad
things will happen.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>builder</code></em> :</span></p></td>
<td>a <a class="link" href="glib-GVariant.html#GVariantBuilder" title="GVariantBuilder"><span class="type">GVariantBuilder</span></a> allocated by <a class="link" href="glib-GVariant.html#g-variant-builder-new" title="g_variant_builder_new ()"><code class="function">g_variant_builder_new()</code></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a new reference to <em class="parameter"><code>builder</code></em>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_builder_new ()">
<a name="g-variant-builder-new"></a><h3>g_variant_builder_new ()</h3>
<pre class="programlisting"><a class="link" href="glib-GVariant.html#GVariantBuilder" title="GVariantBuilder"><span class="returnvalue">GVariantBuilder</span></a> * g_variant_builder_new (<em class="parameter"><code>const <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a> *type</code></em>);</pre>
<p>
Allocates and initialises a new <a class="link" href="glib-GVariant.html#GVariantBuilder" title="GVariantBuilder"><span class="type">GVariantBuilder</span></a>.
</p>
<p>
You should call <a class="link" href="glib-GVariant.html#g-variant-builder-unref" title="g_variant_builder_unref ()"><code class="function">g_variant_builder_unref()</code></a> on the return value when it
is no longer needed. The memory will not be automatically freed by
any other call.
</p>
<p>
In most cases it is easier to place a <a class="link" href="glib-GVariant.html#GVariantBuilder" title="GVariantBuilder"><span class="type">GVariantBuilder</span></a> directly on
the stack of the calling function and initialise it with
<a class="link" href="glib-GVariant.html#g-variant-builder-init" title="g_variant_builder_init ()"><code class="function">g_variant_builder_init()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>type</code></em> :</span></p></td>
<td>a container type
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a <a class="link" href="glib-GVariant.html#GVariantBuilder" title="GVariantBuilder"><span class="type">GVariantBuilder</span></a>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_builder_init ()">
<a name="g-variant-builder-init"></a><h3>g_variant_builder_init ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> g_variant_builder_init (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariantBuilder" title="GVariantBuilder"><span class="type">GVariantBuilder</span></a> *builder</code></em>,
<em class="parameter"><code>const <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a> *type</code></em>);</pre>
<p>
Initialises a <a class="link" href="glib-GVariant.html#GVariantBuilder" title="GVariantBuilder"><span class="type">GVariantBuilder</span></a> structure.
</p>
<p>
<em class="parameter"><code>type</code></em> must be non-<a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>. It specifies the type of container to
construct. It can be an indefinite type such as
<a class="link" href="glib-GVariantType.html#G-VARIANT-TYPE-ARRAY:CAPS" title="G_VARIANT_TYPE_ARRAY"><code class="literal">G_VARIANT_TYPE_ARRAY</code></a> or a definite type such as "as" or "(ii)".
Maybe, array, tuple, dictionary entry and variant-typed values may be
constructed.
</p>
<p>
After the builder is initialised, values are added using
<a class="link" href="glib-GVariant.html#g-variant-builder-add-value" title="g_variant_builder_add_value ()"><code class="function">g_variant_builder_add_value()</code></a> or <a class="link" href="glib-GVariant.html#g-variant-builder-add" title="g_variant_builder_add ()"><code class="function">g_variant_builder_add()</code></a>.
</p>
<p>
After all the child values are added, <a class="link" href="glib-GVariant.html#g-variant-builder-end" title="g_variant_builder_end ()"><code class="function">g_variant_builder_end()</code></a> frees
the memory associated with the builder and returns the <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> that
was created.
</p>
<p>
This function completely ignores the previous contents of <em class="parameter"><code>builder</code></em>.
On one hand this means that it is valid to pass in completely
uninitialised memory. On the other hand, this means that if you are
initialising over top of an existing <a class="link" href="glib-GVariant.html#GVariantBuilder" title="GVariantBuilder"><span class="type">GVariantBuilder</span></a> you need to
first call <a class="link" href="glib-GVariant.html#g-variant-builder-clear" title="g_variant_builder_clear ()"><code class="function">g_variant_builder_clear()</code></a> in order to avoid leaking
memory.
</p>
<p>
You must not call <a class="link" href="glib-GVariant.html#g-variant-builder-ref" title="g_variant_builder_ref ()"><code class="function">g_variant_builder_ref()</code></a> or
<a class="link" href="glib-GVariant.html#g-variant-builder-unref" title="g_variant_builder_unref ()"><code class="function">g_variant_builder_unref()</code></a> on a <a class="link" href="glib-GVariant.html#GVariantBuilder" title="GVariantBuilder"><span class="type">GVariantBuilder</span></a> that was initialised
with this function. If you ever pass a reference to a
<a class="link" href="glib-GVariant.html#GVariantBuilder" title="GVariantBuilder"><span class="type">GVariantBuilder</span></a> outside of the control of your own code then you
should assume that the person receiving that reference may try to use
reference counting; you should use <a class="link" href="glib-GVariant.html#g-variant-builder-new" title="g_variant_builder_new ()"><code class="function">g_variant_builder_new()</code></a> instead of
this function.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>builder</code></em> :</span></p></td>
<td>a <a class="link" href="glib-GVariant.html#GVariantBuilder" title="GVariantBuilder"><span class="type">GVariantBuilder</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>type</code></em> :</span></p></td>
<td>a container type
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_builder_clear ()">
<a name="g-variant-builder-clear"></a><h3>g_variant_builder_clear ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> g_variant_builder_clear (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariantBuilder" title="GVariantBuilder"><span class="type">GVariantBuilder</span></a> *builder</code></em>);</pre>
<p>
Releases all memory associated with a <a class="link" href="glib-GVariant.html#GVariantBuilder" title="GVariantBuilder"><span class="type">GVariantBuilder</span></a> without
freeing the <a class="link" href="glib-GVariant.html#GVariantBuilder" title="GVariantBuilder"><span class="type">GVariantBuilder</span></a> structure itself.
</p>
<p>
It typically only makes sense to do this on a stack-allocated
<a class="link" href="glib-GVariant.html#GVariantBuilder" title="GVariantBuilder"><span class="type">GVariantBuilder</span></a> if you want to abort building the value part-way
through. This function need not be called if you call
<a class="link" href="glib-GVariant.html#g-variant-builder-end" title="g_variant_builder_end ()"><code class="function">g_variant_builder_end()</code></a> and it also doesn't need to be called on
builders allocated with g_variant_builder_new (see
<code class="function">g_variant_builder_free()</code> for that).
</p>
<p>
This function leaves the <a class="link" href="glib-GVariant.html#GVariantBuilder" title="GVariantBuilder"><span class="type">GVariantBuilder</span></a> structure set to all-zeros.
It is valid to call this function on either an initialised
<a class="link" href="glib-GVariant.html#GVariantBuilder" title="GVariantBuilder"><span class="type">GVariantBuilder</span></a> or one that is set to all-zeros but it is not valid
to call this function on uninitialised memory.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>builder</code></em> :</span></p></td>
<td>a <a class="link" href="glib-GVariant.html#GVariantBuilder" title="GVariantBuilder"><span class="type">GVariantBuilder</span></a>
</td>
</tr></tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_builder_add_value ()">
<a name="g-variant-builder-add-value"></a><h3>g_variant_builder_add_value ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> g_variant_builder_add_value (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariantBuilder" title="GVariantBuilder"><span class="type">GVariantBuilder</span></a> *builder</code></em>,
<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> *value</code></em>);</pre>
<p>
Adds <em class="parameter"><code>value</code></em> to <em class="parameter"><code>builder</code></em>.
</p>
<p>
It is an error to call this function in any way that would create an
inconsistent value to be constructed. Some examples of this are
putting different types of items into an array, putting the wrong
types or number of items in a tuple, putting more than one value into
a variant, etc.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>builder</code></em> :</span></p></td>
<td>a <a class="link" href="glib-GVariant.html#GVariantBuilder" title="GVariantBuilder"><span class="type">GVariantBuilder</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
<td>a <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_builder_add ()">
<a name="g-variant-builder-add"></a><h3>g_variant_builder_add ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> g_variant_builder_add (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariantBuilder" title="GVariantBuilder"><span class="type">GVariantBuilder</span></a> *builder</code></em>,
<em class="parameter"><code>const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="type">gchar</span></a> *format_string</code></em>,
<em class="parameter"><code>...</code></em>);</pre>
<p>
Adds to a <a class="link" href="glib-GVariant.html#GVariantBuilder" title="GVariantBuilder"><span class="type">GVariantBuilder</span></a>.
</p>
<p>
This call is a convenience wrapper that is exactly equivalent to
calling <a class="link" href="glib-GVariant.html#g-variant-new" title="g_variant_new ()"><code class="function">g_variant_new()</code></a> followed by <a class="link" href="glib-GVariant.html#g-variant-builder-add-value" title="g_variant_builder_add_value ()"><code class="function">g_variant_builder_add_value()</code></a>.
</p>
<p>
This function might be used as follows:
</p>
<p>
</p>
<pre class="programlisting">
GVariant *
make_pointless_dictionary (void)
{
GVariantBuilder *builder;
int i;
builder = g_variant_builder_new (G_VARIANT_TYPE_CLASS_ARRAY,
NULL);
for (i = 0; i &lt; 16; i++)
{
gchar buf[3];
sprintf (buf, "%d", i);
g_variant_builder_add (builder, "{is}", i, buf);
}
return g_variant_builder_end (builder);
}
</pre>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>builder</code></em> :</span></p></td>
<td>a <a class="link" href="glib-GVariant.html#GVariantBuilder" title="GVariantBuilder"><span class="type">GVariantBuilder</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>format_string</code></em> :</span></p></td>
<td>a <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> varargs format string
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>...</code></em> :</span></p></td>
<td>arguments, as per <em class="parameter"><code>format_string</code></em>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_builder_end ()">
<a name="g-variant-builder-end"></a><h3>g_variant_builder_end ()</h3>
<pre class="programlisting"><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * g_variant_builder_end (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariantBuilder" title="GVariantBuilder"><span class="type">GVariantBuilder</span></a> *builder</code></em>);</pre>
<p>
Ends the builder process and returns the constructed value.
</p>
<p>
This call automatically reduces the reference count on <em class="parameter"><code>builder</code></em> by
one, unless it has previously had <code class="function">g_variant_builder_no_autofree()</code>
called on it. Unless you've taken other actions, this is usually
sufficient to free <em class="parameter"><code>builder</code></em>.
</p>
<p>
Even if additional references are held, it is not permissible to use
<em class="parameter"><code>builder</code></em> in any way after this call except for further reference
counting operations.
</p>
<p>
It is an error to call this function in any way that would create an
inconsistent value to be constructed (ie: insufficient number of
items added to a container with a specific number of children
required). It is also an error to call this function if the builder
was created with an indefinite array or maybe type and no children
have been added; in this case it is impossible to infer the type of
the empty array.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>builder</code></em> :</span></p></td>
<td>a <a class="link" href="glib-GVariant.html#GVariantBuilder" title="GVariantBuilder"><span class="type">GVariantBuilder</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a new, floating, <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_builder_open ()">
<a name="g-variant-builder-open"></a><h3>g_variant_builder_open ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> g_variant_builder_open (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariantBuilder" title="GVariantBuilder"><span class="type">GVariantBuilder</span></a> *builder</code></em>,
<em class="parameter"><code>const <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a> *type</code></em>);</pre>
<p>
Opens a subcontainer inside the given <em class="parameter"><code>builder</code></em>. When done adding
items to the subcontainer, <a class="link" href="glib-GVariant.html#g-variant-builder-close" title="g_variant_builder_close ()"><code class="function">g_variant_builder_close()</code></a> must be called.
</p>
<p>
It is an error to call this function in any way that would cause an
inconsistent value to be constructed (ie: adding too many values or
a value of an incorrect type).
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>builder</code></em> :</span></p></td>
<td>a <a class="link" href="glib-GVariant.html#GVariantBuilder" title="GVariantBuilder"><span class="type">GVariantBuilder</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>type</code></em> :</span></p></td>
<td>a <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="g_variant_builder_close ()">
<a name="g-variant-builder-close"></a><h3>g_variant_builder_close ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> g_variant_builder_close (<em class="parameter"><code><a class="link" href="glib-GVariant.html#GVariantBuilder" title="GVariantBuilder"><span class="type">GVariantBuilder</span></a> *builder</code></em>);</pre>
<p>
Closes the subcontainer inside the given <em class="parameter"><code>builder</code></em> that was opened by
the most recent call to <a class="link" href="glib-GVariant.html#g-variant-builder-open" title="g_variant_builder_open ()"><code class="function">g_variant_builder_open()</code></a>.
</p>
<p>
It is an error to call this function in any way that would create an
inconsistent value to be constructed (ie: too few values added to the
subcontainer).
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>builder</code></em> :</span></p></td>
<td>a <a class="link" href="glib-GVariant.html#GVariantBuilder" title="GVariantBuilder"><span class="type">GVariantBuilder</span></a>
</td>
</tr></tbody>
</table></div>
<p class="since">Since 2.24</p>
</div>
<hr>
<div class="refsect2" title="G_VARIANT_PARSE_ERROR">
<a name="G-VARIANT-PARSE-ERROR:CAPS"></a><h3>G_VARIANT_PARSE_ERROR</h3>
<pre class="programlisting">#define G_VARIANT_PARSE_ERROR (g_variant_parser_get_error_quark ())
</pre>
<p>
Error domain for GVariant text format parsing. Specific error codes
are not currently defined for this domain. See <a class="link" href="glib-Error-Reporting.html#GError" title="GError"><span class="type">GError</span></a> for
information on error domains.
</p>
</div>
<hr>
<div class="refsect2" title="g_variant_parse ()">
<a name="g-variant-parse"></a><h3>g_variant_parse ()</h3>
<pre class="programlisting"><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * g_variant_parse (<em class="parameter"><code>const <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a> *type</code></em>,
<em class="parameter"><code>const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="type">gchar</span></a> *text</code></em>,
<em class="parameter"><code>const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="type">gchar</span></a> *limit</code></em>,
<em class="parameter"><code>const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="type">gchar</span></a> **endptr</code></em>,
<em class="parameter"><code><a class="link" href="glib-Error-Reporting.html#GError" title="GError"><span class="type">GError</span></a> **error</code></em>);</pre>
<p>
Parses a <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> from a text representation.
</p>
<p>
A single <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> is parsed from the content of <em class="parameter"><code>text</code></em>.
</p>
<p>
The memory at <em class="parameter"><code>limit</code></em> will never be accessed and the parser behaves as
if the character at <em class="parameter"><code>limit</code></em> is the nul terminator. This has the
effect of bounding <em class="parameter"><code>text</code></em>.
</p>
<p>
If <em class="parameter"><code>endptr</code></em> is non-<a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a> then <em class="parameter"><code>text</code></em> is permitted to contain data
following the value that this function parses and <em class="parameter"><code>endptr</code></em> will be
updated to point to the first character past the end of the text
parsed by this function. If <em class="parameter"><code>endptr</code></em> is <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a> and there is extra data
then an error is returned.
</p>
<p>
If <em class="parameter"><code>type</code></em> is non-<a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a> then the value will be parsed to have that
type. This may result in additional parse errors (in the case that
the parsed value doesn't fit the type) but may also result in fewer
errors (in the case that the type would have been ambiguous, such as
with empty arrays).
</p>
<p>
In the event that the parsing is successful, the resulting <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a>
is returned.
</p>
<p>
In case of any error, <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a> will be returned. If <em class="parameter"><code>error</code></em> is non-<a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>
then it will be set to reflect the error that occured.
</p>
<p>
Officially, the language understood by the parser is "any string
produced by <a class="link" href="glib-GVariant.html#g-variant-print" title="g_variant_print ()"><code class="function">g_variant_print()</code></a>".
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>type</code></em> :</span></p></td>
<td>a <a class="link" href="glib-GVariantType.html#GVariantType" title="GVariantType"><span class="type">GVariantType</span></a>, or <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>text</code></em> :</span></p></td>
<td>a string containing a GVariant in text form
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>limit</code></em> :</span></p></td>
<td>a pointer to the end of <em class="parameter"><code>text</code></em>, or <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>endptr</code></em> :</span></p></td>
<td>a location to store the end pointer, or <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>error</code></em> :</span></p></td>
<td>a pointer to a <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a> <a class="link" href="glib-Error-Reporting.html#GError" title="GError"><span class="type">GError</span></a> pointer, or <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a reference to a <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a>, or <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="g_variant_new_parsed_va ()">
<a name="g-variant-new-parsed-va"></a><h3>g_variant_new_parsed_va ()</h3>
<pre class="programlisting"><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * g_variant_new_parsed_va (<em class="parameter"><code>const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="type">gchar</span></a> *format</code></em>,
<em class="parameter"><code><span class="type">va_list</span> *app</code></em>);</pre>
<p>
Parses <em class="parameter"><code>format</code></em> and returns the result.
</p>
<p>
This is the version of <a class="link" href="glib-GVariant.html#g-variant-new-parsed" title="g_variant_new_parsed ()"><code class="function">g_variant_new_parsed()</code></a> intended to be used
from libraries.
</p>
<p>
The return value will be floating if it was a newly created GVariant
instance. In the case that <em class="parameter"><code>format</code></em> simply specified the collection
of a <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> pointer (eg: <em class="parameter"><code>format</code></em> was "%*") then the collected
<a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> pointer will be returned unmodified, without adding any
additional references.
</p>
<p>
In order to behave correctly in all cases it is necessary for the
calling function to <a class="link" href="glib-GVariant.html#g-variant-ref-sink" title="g_variant_ref_sink ()"><code class="function">g_variant_ref_sink()</code></a> the return result before
returning control to the user that originally provided the pointer.
At this point, the caller will have their own full reference to the
result. This can also be done by adding the result to a container,
or by passing it to another <a class="link" href="glib-GVariant.html#g-variant-new" title="g_variant_new ()"><code class="function">g_variant_new()</code></a> call.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>format</code></em> :</span></p></td>
<td>a text format <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>app</code></em> :</span></p></td>
<td>a pointer to a <span class="type">va_list</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a new, usually floating, <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="g_variant_new_parsed ()">
<a name="g-variant-new-parsed"></a><h3>g_variant_new_parsed ()</h3>
<pre class="programlisting"><a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="returnvalue">GVariant</span></a> * g_variant_new_parsed (<em class="parameter"><code>const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="type">gchar</span></a> *format</code></em>,
<em class="parameter"><code>...</code></em>);</pre>
<p>
Parses <em class="parameter"><code>format</code></em> and returns the result.
</p>
<p>
<em class="parameter"><code>format</code></em> must be a text format <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> with one extention: at any
point that a value may appear in the text, a '%' character followed
by a GVariant format string (as per <a class="link" href="glib-GVariant.html#g-variant-new" title="g_variant_new ()"><code class="function">g_variant_new()</code></a>) may appear. In
that case, the same arguments are collected from the argument list as
<a class="link" href="glib-GVariant.html#g-variant-new" title="g_variant_new ()"><code class="function">g_variant_new()</code></a> would have collected.
</p>
<p>
Consider this simple example:
</p>
<p>
</p>
<div class="informalexample">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td class="listing_lines" align="right"><pre>1</pre></td>
<td class="listing_code"><pre class="programlisting"><span class="function"><a href="glib-GVariant.html#g-variant-new-parsed">g_variant_new_parsed</a></span><span class="normal"> </span><span class="symbol">(</span><span class="string">"[('one', 1), ('two', %i), (%s, 3)]"</span><span class="symbol">,</span><span class="normal"> </span><span class="number">2</span><span class="symbol">,</span><span class="normal"> </span><span class="string">"three"</span><span class="symbol">);</span></pre></td>
</tr>
</tbody>
</table>
</div>
<p>
</p>
<p>
In the example, the variable argument parameters are collected and
filled in as if they were part of the original string to produce the
result of <code class="code">[('one', 1), ('two', 2), ('three', 3)]</code>.
</p>
<p>
This function is intended only to be used with <em class="parameter"><code>format</code></em> as a string
literal. Any parse error is fatal to the calling process. If you
want to parse data from untrusted sources, use <a class="link" href="glib-GVariant.html#g-variant-parse" title="g_variant_parse ()"><code class="function">g_variant_parse()</code></a>.
</p>
<p>
You may not use this function to return, unmodified, a single
<a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> pointer from the argument list. ie: <em class="parameter"><code>format</code></em> may not solely
be anything along the lines of "%*", "%?", "<code class="literal">r</code>", or anything starting
with "%@".
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>format</code></em> :</span></p></td>
<td>a text format <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>...</code></em> :</span></p></td>
<td>arguments as per <em class="parameter"><code>format</code></em>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a new floating <a class="link" href="glib-GVariant.html#GVariant" title="GVariant"><span class="type">GVariant</span></a> instance
</td>
</tr>
</tbody>
</table></div>
</div>
</div>
<div class="refsect1" title="See Also">
<a name="glib-GVariant.see-also"></a><h2>See Also</h2>
GVariantType
</div>
</div>
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