chromium/native_client_sdk/doc_generated/pepper_beta/c/struct_p_p___array_output.html

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<h1>PP_ArrayOutput Struct Reference</h1>
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Data Fields</h2><table class="memberdecls">

<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="group___typedefs.html#gaa363de651fad7342a37ec58375276af7">PP_ArrayOutput_GetDataBuffer</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="struct_p_p___array_output.html#acfd88c0475e6518cc9ed058c85744c58">GetDataBuffer</a></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void *&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="struct_p_p___array_output.html#a6323083ee2b06f902c9c334c6b10a6d0">user_data</a></td></tr>
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<hr /><a name="details" id="details"></a><h2>Detailed Description</h2>
<div class="textblock"><p>A structure that defines a way for the browser to return arrays of data to the plugin. </p>
<p>The browser can not allocate memory on behalf of the plugin because the plugin and browser may have different allocators.</p>
<p>Array output works by having the browser call to the plugin to allocate a buffer, and then the browser will copy the contents of the array into that buffer.</p>
<p>In C, you would typically implement this as follows:</p>
<div class="fragment"><pre class="fragment"> <span class="keyword">struct </span>MyArrayOutput {
   <span class="keywordtype">void</span>* data;
   <span class="keywordtype">int</span> element_count;
 };
 <span class="keywordtype">void</span>* MyGetDataBuffer(<span class="keywordtype">void</span>* <a class="code" href="struct_p_p___array_output.html#a6323083ee2b06f902c9c334c6b10a6d0" title="Data that is passed to the allocation function.">user_data</a>, uint32_t count, uint32_t size) {
   MyArrayOutput* output = (MyArrayOutput*)user_data;
   output-&gt;element_count = count;
   <span class="keywordflow">if</span> (size) {
     output-&gt;data = malloc(count * size);
     <span class="keywordflow">if</span> (!output-&gt;data)  <span class="comment">// Be careful to set size properly on malloc failure.</span>
       output-&gt;element_count = 0;
   } <span class="keywordflow">else</span> {
     output-&gt;data = NULL;
   }
   <span class="keywordflow">return</span> output-&gt;data;
 }
 <span class="keywordtype">void</span> MyFunction() {
   MyArrayOutput array = { NULL, 0 };
   <a class="code" href="struct_p_p___array_output.html" title="A structure that defines a way for the browser to return arrays of data to the plugin.">PP_ArrayOutput</a> output = { &amp;MyGetDataBuffer, &amp;array };
   ppb_foo-&gt;GetData(&amp;output);
 }
</pre></div> </div><hr /><h2>Field Documentation</h2>
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<td class="memname"><a class="el" href="group___typedefs.html#gaa363de651fad7342a37ec58375276af7">PP_ArrayOutput_GetDataBuffer</a> <a class="el" href="struct_p_p___array_output.html#acfd88c0475e6518cc9ed058c85744c58">PP_ArrayOutput::GetDataBuffer</a></td>
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<p>A pointer to the allocation function that the browser will call. </p>
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<a class="anchor" id="a6323083ee2b06f902c9c334c6b10a6d0"></a><!-- doxytag: member="PP_ArrayOutput::user_data" ref="a6323083ee2b06f902c9c334c6b10a6d0" args="" -->
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<td class="memname">void* <a class="el" href="struct_p_p___array_output.html#a6323083ee2b06f902c9c334c6b10a6d0">PP_ArrayOutput::user_data</a></td>
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<p>Data that is passed to the allocation function. </p>
<p>Typically, this is used to communicate how the data should be stored. </p>
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<hr />The documentation for this struct was generated from the following file:<ul>
<li><a class="el" href="pp__array__output_8h.html">pp_array_output.h</a></li>
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