1 {{+bindTo:partials.standard_nacl_api}} 2 <h1>pp_array_output.h File Reference</h1> 3 <div id="doxygen-ref"> 4 {{- dummy div to appease doxygen -}} 5 <div> 6 <!-- Generated by Doxygen 1.7.6.1 --> 7 8 9 </div> 10 <!--header--> 11 <div class="contents"> 12 <div class="textblock"><div class="dynheader"> 13 Include dependency graph for pp_array_output.h:</div> 14 <div class="dyncontent"> 15 <div class="center"><img src="pp__array__output_8h__incl.png" border="0" usemap="#pp__array__output_8h" alt="" /></div> 16 <map name="pp__array__output_8h" id="pp__array__output_8h"> 17 </map> 18 </div> 19 </div><h2> 20 Data Structures</h2><table class="memberdecls"> 21 22 <tr><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="struct_p_p___array_output.html">PP_ArrayOutput</a></td></tr> 23 <tr><td class="mdescLeft"> </td><td class="mdescRight">A structure that defines a way for the browser to return arrays of data to the plugin. <a href="struct_p_p___array_output.html#details">More...</a><br /></td></tr> 24 </table><h2> 25 Typedefs</h2><table class="memberdecls"> 26 <tr><td class="memItemLeft" align="right" valign="top">typedef void *(* </td><td class="memItemRight" valign="bottom"><a class="el" href="group___typedefs.html#gaa363de651fad7342a37ec58375276af7">PP_ArrayOutput_GetDataBuffer</a> )(void *user_data, uint32_t element_count, uint32_t element_size)</td></tr> 27 </table> 28 <hr /><a name="details" id="details"></a><h2>Detailed Description</h2> 29 <div class="textblock"><p>PP_ArrayOutput_GetDataBuffer is a callback function to allocate plugin memory for an array. </p> 30 <p>It returns the allocated memory or null on failure.</p> 31 <p>This function will be called reentrantly. This means that if you call a function PPB_Foo.GetData(&array_output), GetData will call your GetDataBuffer function before it returns.</p> 32 <p>This function will be called even when returning 0-length arrays, so be sure your implementation can support that. You can return NULL for 0 length arrays and it will not be treated as a failure.</p> 33 <p>You should not perform any processing in this callback, including calling other PPAPI functions, outside of allocating memory. You should not throw any exceptions. In C++, this means using "new (nothrow)" or being sure to catch any exceptions before returning.</p> 34 <p>The C++ wrapper provides a convenient templatized implementation around std::vector which you should generally use instead of coding this specifically.</p> 35 <dl class="params"><dt><b>Parameters:</b></dt><dd> 36 <table class="params"> 37 <tr><td class="paramname">user_data</td><td>The pointer provided in the <a class="el" 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> structure. This has no meaning to the browser, it is intended to be used by the implementation to figure out where to put the data.</td></tr> 38 <tr><td class="paramname">element_count</td><td>The number of elements in the array. This will be 0 if there is no data to return.</td></tr> 39 <tr><td class="paramname">element_size</td><td>The size of each element in bytes.</td></tr> 40 </table> 41 </dd> 42 </dl> 43 <dl class="return"><dt><b>Returns:</b></dt><dd>Returns a pointer to the allocated memory. On failure, returns null. You can also return null if the element_count is 0. When a non-null value is returned, the buffer must remain valid until after the callback runs. If used with a blocking callback, the buffer must remain valid until after the function returns. The plugin can then free any memory that it allocated. </dd></dl> 44 </div></div><!-- contents --> 45 </div> 46 {{/partials.standard_nacl_api}} 47