Edit File: cobject.html
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>CObjects — Python v2.6.6 documentation</title> <link rel="stylesheet" href="../_static/default.css" type="text/css" /> <link rel="stylesheet" href="../_static/pygments.css" type="text/css" /> <script type="text/javascript"> var DOCUMENTATION_OPTIONS = { URL_ROOT: '../', VERSION: '2.6.6', COLLAPSE_MODINDEX: false, FILE_SUFFIX: '.html', HAS_SOURCE: true }; </script> <script type="text/javascript" src="../_static/jquery.js"></script> <script type="text/javascript" src="../_static/doctools.js"></script> <link rel="search" type="application/opensearchdescription+xml" title="Search within Python v2.6.6 documentation" href="../_static/opensearch.xml"/> <link rel="author" title="About these documents" href="../about.html" /> <link rel="copyright" title="Copyright" href="../copyright.html" /> <link rel="top" title="Python v2.6.6 documentation" href="../index.html" /> <link rel="up" title="Concrete Objects Layer" href="concrete.html" /> <link rel="next" title="Cell Objects" href="cell.html" /> <link rel="prev" title="Weak Reference Objects" href="weakref.html" /> <link rel="shortcut icon" type="image/png" href="../_static/py.png" /> </head> <body> <div class="related"> <h3>Navigation</h3> <ul> <li class="right" style="margin-right: 10px"> <a href="../genindex.html" title="General Index" accesskey="I">index</a></li> <li class="right" > <a href="../modindex.html" title="Global Module Index" accesskey="M">modules</a> |</li> <li class="right" > <a href="cell.html" title="Cell Objects" accesskey="N">next</a> |</li> <li class="right" > <a href="weakref.html" title="Weak Reference Objects" accesskey="P">previous</a> |</li> <li><img src="../_static/py.png" alt="" style="vertical-align: middle; margin-top: -1px"/></li> <li><a href="../index.html">Python v2.6.6 documentation</a> »</li> <li><a href="index.html" >Python/C API Reference Manual</a> »</li> <li><a href="concrete.html" accesskey="U">Concrete Objects Layer</a> »</li> </ul> </div> <div class="document"> <div class="documentwrapper"> <div class="bodywrapper"> <div class="body"> <div class="section" id="cobjects"> <span id="id1"></span><h1>CObjects<a class="headerlink" href="#cobjects" title="Permalink to this headline">¶</a></h1> <p id="index-7">Refer to <a class="reference external" href="../extending/extending.html#using-cobjects"><em>Providing a C API for an Extension Module</em></a> for more information on using these objects.</p> <dl class="ctype"> <dt id="PyCObject"> <tt class="descname">PyCObject</tt><a class="headerlink" href="#PyCObject" title="Permalink to this definition">¶</a></dt> <dd>This subtype of <a title="PyObject" class="reference external" href="structures.html#PyObject"><tt class="xref docutils literal"><span class="pre">PyObject</span></tt></a> represents an opaque value, useful for C extension modules who need to pass an opaque value (as a <tt class="xref docutils literal"><span class="pre">void*</span></tt> pointer) through Python code to other C code. It is often used to make a C function pointer defined in one module available to other modules, so the regular import mechanism can be used to access C APIs defined in dynamically loaded modules.</dd></dl> <dl class="cfunction"> <dt id="PyCObject_Check"> int <tt class="descname">PyCObject_Check</tt><big>(</big><a title="PyObject" class="reference external" href="structures.html#PyObject">PyObject</a><em> *p</em><big>)</big><a class="headerlink" href="#PyCObject_Check" title="Permalink to this definition">¶</a></dt> <dd>Return true if its argument is a <a title="PyCObject" class="reference internal" href="#PyCObject"><tt class="xref docutils literal"><span class="pre">PyCObject</span></tt></a>.</dd></dl> <dl class="cfunction"> <dt id="PyCObject_FromVoidPtr"> <a title="PyObject" class="reference external" href="structures.html#PyObject">PyObject</a>* <tt class="descname">PyCObject_FromVoidPtr</tt><big>(</big>void*<em> cobj</em>, void (*destr)(void<em> *)</em><big>)</big><a class="headerlink" href="#PyCObject_FromVoidPtr" title="Permalink to this definition">¶</a></dt> <dd><em class="refcount">Return value: New reference.</em><p>Create a <a title="PyCObject" class="reference internal" href="#PyCObject"><tt class="xref docutils literal"><span class="pre">PyCObject</span></tt></a> from the <tt class="docutils literal"><span class="pre">void</span> <span class="pre">*</span></tt> <em>cobj</em>. The <em>destr</em> function will be called when the object is reclaimed, unless it is <em>NULL</em>.</p> </dd></dl> <dl class="cfunction"> <dt id="PyCObject_FromVoidPtrAndDesc"> <a title="PyObject" class="reference external" href="structures.html#PyObject">PyObject</a>* <tt class="descname">PyCObject_FromVoidPtrAndDesc</tt><big>(</big>void*<em> cobj</em>, void*<em> desc</em>, void (*destr)(void<em> *</em>, void<em> *)</em><big>)</big><a class="headerlink" href="#PyCObject_FromVoidPtrAndDesc" title="Permalink to this definition">¶</a></dt> <dd><em class="refcount">Return value: New reference.</em><p>Create a <a title="PyCObject" class="reference internal" href="#PyCObject"><tt class="xref docutils literal"><span class="pre">PyCObject</span></tt></a> from the <tt class="xref docutils literal"><span class="pre">void</span> <span class="pre">*</span></tt> <em>cobj</em>. The <em>destr</em> function will be called when the object is reclaimed. The <em>desc</em> argument can be used to pass extra callback data for the destructor function.</p> </dd></dl> <dl class="cfunction"> <dt id="PyCObject_AsVoidPtr"> void* <tt class="descname">PyCObject_AsVoidPtr</tt><big>(</big><a title="PyObject" class="reference external" href="structures.html#PyObject">PyObject</a>*<em> self</em><big>)</big><a class="headerlink" href="#PyCObject_AsVoidPtr" title="Permalink to this definition">¶</a></dt> <dd>Return the object <tt class="xref docutils literal"><span class="pre">void</span> <span class="pre">*</span></tt> that the <a title="PyCObject" class="reference internal" href="#PyCObject"><tt class="xref docutils literal"><span class="pre">PyCObject</span></tt></a> <em>self</em> was created with.</dd></dl> <dl class="cfunction"> <dt id="PyCObject_GetDesc"> void* <tt class="descname">PyCObject_GetDesc</tt><big>(</big><a title="PyObject" class="reference external" href="structures.html#PyObject">PyObject</a>*<em> self</em><big>)</big><a class="headerlink" href="#PyCObject_GetDesc" title="Permalink to this definition">¶</a></dt> <dd>Return the description <tt class="xref docutils literal"><span class="pre">void</span> <span class="pre">*</span></tt> that the <a title="PyCObject" class="reference internal" href="#PyCObject"><tt class="xref docutils literal"><span class="pre">PyCObject</span></tt></a> <em>self</em> was created with.</dd></dl> <dl class="cfunction"> <dt id="PyCObject_SetVoidPtr"> int <tt class="descname">PyCObject_SetVoidPtr</tt><big>(</big><a title="PyObject" class="reference external" href="structures.html#PyObject">PyObject</a>*<em> self</em>, void*<em> cobj</em><big>)</big><a class="headerlink" href="#PyCObject_SetVoidPtr" title="Permalink to this definition">¶</a></dt> <dd>Set the void pointer inside <em>self</em> to <em>cobj</em>. The <a title="PyCObject" class="reference internal" href="#PyCObject"><tt class="xref docutils literal"><span class="pre">PyCObject</span></tt></a> must not have an associated destructor. Return true on success, false on failure.</dd></dl> </div> </div> </div> </div> <div class="sphinxsidebar"> <div class="sphinxsidebarwrapper"> <h4>Previous topic</h4> <p class="topless"><a href="weakref.html" title="previous chapter">Weak Reference Objects</a></p> <h4>Next topic</h4> <p class="topless"><a href="cell.html" title="next chapter">Cell Objects</a></p> <h3>This Page</h3> <ul class="this-page-menu"> <li><a href="../bugs.html">Report a Bug</a></li> <li><a href="../_sources/c-api/cobject.txt" rel="nofollow">Show Source</a></li> </ul> <div id="searchbox" style="display: none"> <h3>Quick search</h3> <form class="search" action="../search.html" method="get"> <input type="text" name="q" size="18" /> <input type="submit" value="Go" /> <input type="hidden" name="check_keywords" value="yes" /> <input type="hidden" name="area" value="default" /> </form> <p class="searchtip" style="font-size: 90%"> Enter search terms or a module, class or function name. </p> </div> <script type="text/javascript">$('#searchbox').show(0);</script> </div> </div> <div class="clearer"></div> </div> <div class="related"> <h3>Navigation</h3> <ul> <li class="right" style="margin-right: 10px"> <a href="../genindex.html" title="General Index" >index</a></li> <li class="right" > <a href="../modindex.html" title="Global Module Index" >modules</a> |</li> <li class="right" > <a href="cell.html" title="Cell Objects" >next</a> |</li> <li class="right" > <a href="weakref.html" title="Weak Reference Objects" >previous</a> |</li> <li><img src="../_static/py.png" alt="" style="vertical-align: middle; margin-top: -1px"/></li> <li><a href="../index.html">Python v2.6.6 documentation</a> »</li> <li><a href="index.html" >Python/C API Reference Manual</a> »</li> <li><a href="concrete.html" >Concrete Objects Layer</a> »</li> </ul> </div> <div class="footer"> © <a href="../copyright.html">Copyright</a> 1990-2011, Python Software Foundation. <br /> The Python Software Foundation is a non-profit corporation. <a href="http://www.python.org/psf/donations/">Please donate.</a> <br /> Last updated on Jul 20, 2011. <a href="../bugs.html">Found a bug</a>? <br /> Created using <a href="http://sphinx.pocoo.org/">Sphinx</a> 0.6.6. </div> </body> </html>
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