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 <div class="refentry" title="GMemoryOutputStream">
 <a name="GMemoryOutputStream"></a><div class="titlepage"></div>
 <div class="refnamediv"><table width="100%"><tr>
 <td valign="top">
 <h2><span class="refentrytitle"><a name="GMemoryOutputStream.top_of_page"></a>GMemoryOutputStream</span></h2>
 <p>GMemoryOutputStream — Streaming output operations on memory chunks</p>
 </td>
 <td valign="top" align="right"></td>
 </tr></table></div>
 <div class="refsynopsisdiv" title="Synopsis">
 <a name="GMemoryOutputStream.synopsis"></a><h2>Synopsis</h2>
 <pre class="synopsis">
 #include &lt;gio/gio.h&gt;

 <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="returnvalue">gpointer</span></a>            (<a class="link" href="GMemoryOutputStream.html#GReallocFunc" title="GReallocFunc ()">*GReallocFunc</a>)                     (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> data</code></em>,
                                                          <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gsize"><span class="type">gsize</span></a> size</code></em>);
                     <a class="link" href="GMemoryOutputStream.html#GMemoryOutputStream-struct" title="GMemoryOutputStream">GMemoryOutputStream</a>;
 <a class="link" href="GOutputStream.html" title="GOutputStream"><span class="returnvalue">GOutputStream</span></a> *     <a class="link" href="GMemoryOutputStream.html#g-memory-output-stream-new" title="g_memory_output_stream_new ()">g_memory_output_stream_new</a>          (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> data</code></em>,
                                                          <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gsize"><span class="type">gsize</span></a> size</code></em>,
                                                          <em class="parameter"><code><a class="link" href="GMemoryOutputStream.html#GReallocFunc" title="GReallocFunc ()"><span class="type">GReallocFunc</span></a> realloc_function</code></em>,
                                                          <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Datasets.html#GDestroyNotify"><span class="type">GDestroyNotify</span></a> destroy_function</code></em>);
 <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="returnvalue">gpointer</span></a>            <a class="link" href="GMemoryOutputStream.html#g-memory-output-stream-get-data" title="g_memory_output_stream_get_data ()">g_memory_output_stream_get_data</a>     (<em class="parameter"><code><a class="link" href="GMemoryOutputStream.html" title="GMemoryOutputStream"><span class="type">GMemoryOutputStream</span></a> *ostream</code></em>);
 <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gsize"><span class="returnvalue">gsize</span></a>               <a class="link" href="GMemoryOutputStream.html#g-memory-output-stream-get-size" title="g_memory_output_stream_get_size ()">g_memory_output_stream_get_size</a>     (<em class="parameter"><code><a class="link" href="GMemoryOutputStream.html" title="GMemoryOutputStream"><span class="type">GMemoryOutputStream</span></a> *ostream</code></em>);
 <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gsize"><span class="returnvalue">gsize</span></a>               <a class="link" href="GMemoryOutputStream.html#g-memory-output-stream-get-data-size" title="g_memory_output_stream_get_data_size ()">g_memory_output_stream_get_data_size</a>
                                                         (<em class="parameter"><code><a class="link" href="GMemoryOutputStream.html" title="GMemoryOutputStream"><span class="type">GMemoryOutputStream</span></a> *ostream</code></em>);
 </pre>
 </div>
 <div class="refsect1" title="Object Hierarchy">
 <a name="GMemoryOutputStream.object-hierarchy"></a><h2>Object Hierarchy</h2>
 <pre class="synopsis">
   <a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject">GObject</a>
    +----<a class="link" href="GOutputStream.html" title="GOutputStream">GOutputStream</a>
          +----GMemoryOutputStream
 </pre>
 </div>
 <div class="refsect1" title="Implemented Interfaces">
 <a name="GMemoryOutputStream.implemented-interfaces"></a><h2>Implemented Interfaces</h2>
 <p>
 GMemoryOutputStream implements
  <a class="link" href="GSeekable.html" title="GSeekable">GSeekable</a>.</p>
 </div>
 <div class="refsect1" title="Properties">
 <a name="GMemoryOutputStream.properties"></a><h2>Properties</h2>
 <pre class="synopsis">
   "<a class="link" href="GMemoryOutputStream.html#GMemoryOutputStream--data" title='The "data" property'>data</a>"                     <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a>              : Read / Write / Construct Only
   "<a class="link" href="GMemoryOutputStream.html#GMemoryOutputStream--data-size" title='The "data-size" property'>data-size</a>"                <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gulong"><span class="type">gulong</span></a>                : Read
   "<a class="link" href="GMemoryOutputStream.html#GMemoryOutputStream--destroy-function" title='The "destroy-function" property'>destroy-function</a>"         <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a>              : Read / Write / Construct Only
   "<a class="link" href="GMemoryOutputStream.html#GMemoryOutputStream--realloc-function" title='The "realloc-function" property'>realloc-function</a>"         <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a>              : Read / Write / Construct Only
   "<a class="link" href="GMemoryOutputStream.html#GMemoryOutputStream--size" title='The "size" property'>size</a>"                     <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gulong"><span class="type">gulong</span></a>                : Read / Write / Construct Only
 </pre>
 </div>
 <div class="refsect1" title="Description">
 <a name="GMemoryOutputStream.description"></a><h2>Description</h2>
 <p>
 <a class="link" href="GMemoryOutputStream.html" title="GMemoryOutputStream"><span class="type">GMemoryOutputStream</span></a> is a class for using arbitrary
 memory chunks as output for GIO streaming output operations.
 </p>
 </div>
 <div class="refsect1" title="Details">
 <a name="GMemoryOutputStream.details"></a><h2>Details</h2>
 <div class="refsect2" title="GReallocFunc ()">
 <a name="GReallocFunc"></a><h3>GReallocFunc ()</h3>
 <pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="returnvalue">gpointer</span></a>            (*GReallocFunc)                     (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> data</code></em>,
                                                          <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gsize"><span class="type">gsize</span></a> size</code></em>);</pre>
 <p>
 Changes the size of the memory block pointed to by <em class="parameter"><code>data</code></em> to
 <em class="parameter"><code>size</code></em> bytes.
 </p>
 <p>
 The function should have the same semantics as <code class="function">realloc()</code>.
 </p>
 <div class="variablelist"><table border="0">
 <col align="left" valign="top">
 <tbody>
 <tr>
 <td><p><span class="term"><em class="parameter"><code>data</code></em> :</span></p></td>
 <td>memory block to reallocate
 </td>
 </tr>
 <tr>
 <td><p><span class="term"><em class="parameter"><code>size</code></em> :</span></p></td>
 <td>size to reallocate <em class="parameter"><code>data</code></em> to
 </td>
 </tr>
 <tr>
 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 <td> a pointer to the reallocated memory
 </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <hr>
 <div class="refsect2" title="GMemoryOutputStream">
 <a name="GMemoryOutputStream-struct"></a><h3>GMemoryOutputStream</h3>
 <pre class="programlisting">typedef struct _GMemoryOutputStream GMemoryOutputStream;</pre>
 <p>
 Implements <a class="link" href="GOutputStream.html" title="GOutputStream"><span class="type">GOutputStream</span></a> for arbitrary memory chunks.
 </p>
 </div>
 <hr>
 <div class="refsect2" title="g_memory_output_stream_new ()">
 <a name="g-memory-output-stream-new"></a><h3>g_memory_output_stream_new ()</h3>
 <pre class="programlisting"><a class="link" href="GOutputStream.html" title="GOutputStream"><span class="returnvalue">GOutputStream</span></a> *     g_memory_output_stream_new          (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> data</code></em>,
                                                          <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gsize"><span class="type">gsize</span></a> size</code></em>,
                                                          <em class="parameter"><code><a class="link" href="GMemoryOutputStream.html#GReallocFunc" title="GReallocFunc ()"><span class="type">GReallocFunc</span></a> realloc_function</code></em>,
                                                          <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Datasets.html#GDestroyNotify"><span class="type">GDestroyNotify</span></a> destroy_function</code></em>);</pre>
 <p>
 Creates a new <a class="link" href="GMemoryOutputStream.html" title="GMemoryOutputStream"><span class="type">GMemoryOutputStream</span></a>.
 </p>
 <p>
 If <em class="parameter"><code>data</code></em> is non-<a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>, the stream  will use that for its internal storage.
 If <em class="parameter"><code>realloc_fn</code></em> is non-<a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>, it will be used for resizing the internal
 storage when necessary. To construct a fixed-size output stream,
 pass <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> as <em class="parameter"><code>realloc_fn</code></em>.
 </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
 2
 3
 4
 5
 6
 7
 8
 9</pre></td>
         <td class="listing_code"><pre class="programlisting"><span class="comment">/* a stream that can grow */</span>
 <span class="normal">stream </span><span class="symbol">=</span><span class="normal"> </span><span class="function"><a href="GMemoryOutputStream.html#g-memory-output-stream-new">g_memory_output_stream_new</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal"><a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS">NULL</a></span><span class="symbol">,</span><span class="normal"> </span><span class="number">0</span><span class="symbol">,</span><span class="normal"> realloc</span><span class="symbol">,</span><span class="normal"> free</span><span class="symbol">);</span>

 <span class="comment">/* another stream that can grow */</span>
 <span class="normal">stream2 </span><span class="symbol">=</span><span class="normal"> </span><span class="function"><a href="GMemoryOutputStream.html#g-memory-output-stream-new">g_memory_output_stream_new</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal"><a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS">NULL</a></span><span class="symbol">,</span><span class="normal"> </span><span class="number">0</span><span class="symbol">,</span><span class="normal"> <a href="/usr/share/gtk-doc/html/glib/glib-Memory-Allocation.html#g-realloc">g_realloc</a></span><span class="symbol">,</span><span class="normal"> <a href="/usr/share/gtk-doc/html/glib/glib-Memory-Allocation.html#g-free">g_free</a></span><span class="symbol">);</span>

 <span class="comment">/* a fixed-size stream */</span>
 <span class="normal">data </span><span class="symbol">=</span><span class="normal"> </span><span class="function">malloc</span><span class="normal"> </span><span class="symbol">(</span><span class="number">200</span><span class="symbol">);</span>
 <span class="normal">stream3 </span><span class="symbol">=</span><span class="normal"> </span><span class="function"><a href="GMemoryOutputStream.html#g-memory-output-stream-new">g_memory_output_stream_new</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">data</span><span class="symbol">,</span><span class="normal"> </span><span class="number">200</span><span class="symbol">,</span><span class="normal"> <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS">NULL</a></span><span class="symbol">,</span><span class="normal"> free</span><span class="symbol">);</span></pre></td>
       </tr>
     </tbody>
   </table>
 </div>

 <p>
 </p>
 <div class="variablelist"><table border="0">
 <col align="left" valign="top">
 <tbody>
 <tr>
 <td><p><span class="term"><em class="parameter"><code>data</code></em> :</span></p></td>
 <td>pointer to a chunk of memory to use, or <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>
 </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>realloc_function</code></em> :</span></p></td>
 <td>a function with <code class="function">realloc()</code> semantics (like <a href="/usr/share/gtk-doc/html/glib/glib-Memory-Allocation.html#g-realloc"><code class="function">g_realloc()</code></a>)
     to be called when <em class="parameter"><code>data</code></em> needs to be grown, or <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>
 </td>
 </tr>
 <tr>
 <td><p><span class="term"><em class="parameter"><code>destroy_function</code></em> :</span></p></td>
 <td>a function to be called on <em class="parameter"><code>data</code></em> when the stream is
     finalized, or <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><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 newly created <a class="link" href="GMemoryOutputStream.html" title="GMemoryOutputStream"><span class="type">GMemoryOutputStream</span></a> object.
 </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <hr>
 <div class="refsect2" title="g_memory_output_stream_get_data ()">
 <a name="g-memory-output-stream-get-data"></a><h3>g_memory_output_stream_get_data ()</h3>
 <pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="returnvalue">gpointer</span></a>            g_memory_output_stream_get_data     (<em class="parameter"><code><a class="link" href="GMemoryOutputStream.html" title="GMemoryOutputStream"><span class="type">GMemoryOutputStream</span></a> *ostream</code></em>);</pre>
 <p>
 Gets any loaded data from the <em class="parameter"><code>ostream</code></em>.
 </p>
 <p>
 Note that the returned pointer may become invalid on the next
 write or truncate operation on the stream.
 </p>
 <div class="variablelist"><table border="0">
 <col align="left" valign="top">
 <tbody>
 <tr>
 <td><p><span class="term"><em class="parameter"><code>ostream</code></em> :</span></p></td>
 <td>a <a class="link" href="GMemoryOutputStream.html" title="GMemoryOutputStream"><span class="type">GMemoryOutputStream</span></a>
 </td>
 </tr>
 <tr>
 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 <td> pointer to the stream's data
 </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <hr>
 <div class="refsect2" title="g_memory_output_stream_get_size ()">
 <a name="g-memory-output-stream-get-size"></a><h3>g_memory_output_stream_get_size ()</h3>
 <pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gsize"><span class="returnvalue">gsize</span></a>               g_memory_output_stream_get_size     (<em class="parameter"><code><a class="link" href="GMemoryOutputStream.html" title="GMemoryOutputStream"><span class="type">GMemoryOutputStream</span></a> *ostream</code></em>);</pre>
 <p>
 Gets the size of the currently allocated data area (availible from
 <a class="link" href="GMemoryOutputStream.html#g-memory-output-stream-get-data" title="g_memory_output_stream_get_data ()"><code class="function">g_memory_output_stream_get_data()</code></a>). If the stream isn't
 growable (no realloc was passed to <a class="link" href="GMemoryOutputStream.html#g-memory-output-stream-new" title="g_memory_output_stream_new ()"><code class="function">g_memory_output_stream_new()</code></a>) then
 this is the maximum size of the stream and further writes
 will return <a class="link" href="gio-GIOError.html#G-IO-ERROR-NO-SPACE:CAPS"><code class="literal">G_IO_ERROR_NO_SPACE</code></a>.
 </p>
 <p>
 Note that for growable streams the returned size may become invalid on
 the next write or truncate operation on the stream.
 </p>
 <p>
 If you want the number of bytes currently written to the stream, use
 <a class="link" href="GMemoryOutputStream.html#g-memory-output-stream-get-data-size" title="g_memory_output_stream_get_data_size ()"><code class="function">g_memory_output_stream_get_data_size()</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>ostream</code></em> :</span></p></td>
 <td>a <a class="link" href="GMemoryOutputStream.html" title="GMemoryOutputStream"><span class="type">GMemoryOutputStream</span></a>
 </td>
 </tr>
 <tr>
 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 <td> the number of bytes allocated for the data buffer
 </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <hr>
 <div class="refsect2" title="g_memory_output_stream_get_data_size ()">
 <a name="g-memory-output-stream-get-data-size"></a><h3>g_memory_output_stream_get_data_size ()</h3>
 <pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gsize"><span class="returnvalue">gsize</span></a>               g_memory_output_stream_get_data_size
                                                         (<em class="parameter"><code><a class="link" href="GMemoryOutputStream.html" title="GMemoryOutputStream"><span class="type">GMemoryOutputStream</span></a> *ostream</code></em>);</pre>
 <p>
 Returns the number of bytes from the start up
 to including the last byte written in the stream
 that has not been truncated away.
 </p>
 <div class="variablelist"><table border="0">
 <col align="left" valign="top">
 <tbody>
 <tr>
 <td><p><span class="term"><em class="parameter"><code>ostream</code></em> :</span></p></td>
 <td>a <a class="link" href="GMemoryOutputStream.html" title="GMemoryOutputStream"><span class="type">GMemoryOutputStream</span></a>
 </td>
 </tr>
 <tr>
 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 <td> the number of bytes written to the stream

 </td>
 </tr>
 </tbody>
 </table></div>
 <p class="since">Since 2.18</p>
 </div>
 </div>
 <div class="refsect1" title="Property Details">
 <a name="GMemoryOutputStream.property-details"></a><h2>Property Details</h2>
 <div class="refsect2" title='The "data" property'>
 <a name="GMemoryOutputStream--data"></a><h3>The <code class="literal">"data"</code> property</h3>
 <pre class="programlisting">  "data"                     <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a>              : Read / Write / Construct Only</pre>
 <p>
 Pointer to buffer where data will be written.
 </p>
 <p class="since">Since 2.24</p>
 </div>
 <hr>
 <div class="refsect2" title='The "data-size" property'>
 <a name="GMemoryOutputStream--data-size"></a><h3>The <code class="literal">"data-size"</code> property</h3>
 <pre class="programlisting">  "data-size"                <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gulong"><span class="type">gulong</span></a>                : Read</pre>
 <p>
 Size of data written to the buffer.
 </p>
 <p class="since">Since 2.24</p>
 </div>
 <hr>
 <div class="refsect2" title='The "destroy-function" property'>
 <a name="GMemoryOutputStream--destroy-function"></a><h3>The <code class="literal">"destroy-function"</code> property</h3>
 <pre class="programlisting">  "destroy-function"         <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a>              : Read / Write / Construct Only</pre>
 <p>
 Function called with the buffer as argument when the stream is destroyed.
 </p>
 <p class="since">Since 2.24</p>
 </div>
 <hr>
 <div class="refsect2" title='The "realloc-function" property'>
 <a name="GMemoryOutputStream--realloc-function"></a><h3>The <code class="literal">"realloc-function"</code> property</h3>
 <pre class="programlisting">  "realloc-function"         <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a>              : Read / Write / Construct Only</pre>
 <p>
 Function with realloc semantics called to enlarge the buffer.
 </p>
 <p class="since">Since 2.24</p>
 </div>
 <hr>
 <div class="refsect2" title='The "size" property'>
 <a name="GMemoryOutputStream--size"></a><h3>The <code class="literal">"size"</code> property</h3>
 <pre class="programlisting">  "size"                     <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gulong"><span class="type">gulong</span></a>                : Read / Write / Construct Only</pre>
 <p>
 Current size of the data buffer.
 </p>
 <p class="since">Since 2.24</p>
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 <div class="refsect1" title="See Also">
 <a name="GMemoryOutputStream.see-also"></a><h2>See Also</h2>
 <a class="link" href="GMemoryInputStream.html" title="GMemoryInputStream"><span class="type">GMemoryInputStream</span></a>
 </div>
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