/
usr
/
share
/
doc
/
python2-docs
/
html
/
c-api
/
/usr/share/doc/python2-docs/html/c-api
mkdir
upload
Name
Size
Mode
Actions
abstract.html
7475
0644
edit
dl
rm
allocation.html
18783
0644
edit
dl
rm
arg.html
61746
0644
edit
dl
rm
bool.html
10025
0644
edit
dl
rm
buffer.html
48743
0644
edit
dl
rm
bytearray.html
14205
0644
edit
dl
rm
capsule.html
20971
0644
edit
dl
rm
cell.html
11194
0644
edit
dl
rm
class.html
11417
0644
edit
dl
rm
cobject.html
12082
0644
edit
dl
rm
code.html
11664
0644
edit
dl
rm
codec.html
21321
0644
edit
dl
rm
complex.html
20897
0644
edit
dl
rm
concrete.html
15868
0644
edit
dl
rm
conversion.html
23406
0644
edit
dl
rm
datetime.html
26469
0644
edit
dl
rm
descriptor.html
12035
0644
edit
dl
rm
dict.html
33222
0644
edit
dl
rm
exceptions.html
92999
0644
edit
dl
rm
file.html
24313
0644
edit
dl
rm
float.html
17526
0644
edit
dl
rm
function.html
14312
0644
edit
dl
rm
gcsupport.html
23878
0644
edit
dl
rm
gen.html
8524
0644
edit
dl
rm
import.html
35730
0644
edit
dl
rm
index.html
13463
0644
edit
dl
rm
init.html
107309
0644
edit
dl
rm
int.html
20528
0644
edit
dl
rm
intro.html
66178
0644
edit
dl
rm
iter.html
10162
0644
edit
dl
rm
iterator.html
11830
0644
edit
dl
rm
list.html
24670
0644
edit
dl
rm
long.html
33667
0644
edit
dl
rm
mapping.html
16026
0644
edit
dl
rm
marshal.html
16257
0644
edit
dl
rm
memory.html
32963
0644
edit
dl
rm
method.html
13606
0644
edit
dl
rm
module.html
17150
0644
edit
dl
rm
none.html
8027
0644
edit
dl
rm
number.html
48578
0644
edit
dl
rm
objbuffer.html
12307
0644
edit
dl
rm
object.html
59828
0644
edit
dl
rm
objimpl.html
7249
0644
edit
dl
rm
refcounting.html
12844
0644
edit
dl
rm
reflection.html
10691
0644
edit
dl
rm
sequence.html
32324
0644
edit
dl
rm
set.html
31735
0644
edit
dl
rm
slice.html
13587
0644
edit
dl
rm
string.html
36740
0644
edit
dl
rm
structures.html
39419
0644
edit
dl
rm
sys.html
21239
0644
edit
dl
rm
tuple.html
21489
0644
edit
dl
rm
type.html
14996
0644
edit
dl
rm
typeobj.html
181174
0644
edit
dl
rm
unicode.html
118633
0644
edit
dl
rm
utilities.html
7588
0644
edit
dl
rm
veryhigh.html
44510
0644
edit
dl
rm
weakref.html
13603
0644
edit
dl
rm
Edit:
/usr/share/doc/python2-docs/html/c-api/capsule.html
(20971B)
<!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="X-UA-Compatible" content="IE=Edge" /> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>Capsules — Python 2.7.16 documentation</title> <link rel="stylesheet" href="../_static/classic.css" type="text/css" /> <link rel="stylesheet" href="../_static/pygments.css" type="text/css" /> <script type="text/javascript" id="documentation_options" data-url_root="../" src="../_static/documentation_options.js"></script> <script type="text/javascript" src="../_static/jquery.js"></script> <script type="text/javascript" src="../_static/underscore.js"></script> <script type="text/javascript" src="../_static/doctools.js"></script> <script type="text/javascript" src="../_static/sidebar.js"></script> <link rel="search" type="application/opensearchdescription+xml" title="Search within Python 2.7.16 documentation" href="../_static/opensearch.xml"/> <link rel="author" title="About these documents" href="../about.html" /> <link rel="index" title="Index" href="../genindex.html" /> <link rel="search" title="Search" href="../search.html" /> <link rel="copyright" title="Copyright" href="../copyright.html" /> <link rel="next" title="CObjects" href="cobject.html" /> <link rel="prev" title="Weak Reference Objects" href="weakref.html" /> <link rel="shortcut icon" type="image/png" href="../_static/py.png" /> <link rel="canonical" href="https://docs.python.org/2/c-api/capsule.html" /> <script type="text/javascript" src="../_static/copybutton.js"></script> </head><body> <div class="related" role="navigation" aria-label="related navigation"> <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="../py-modindex.html" title="Python Module Index" >modules</a> |</li> <li class="right" > <a href="cobject.html" title="CObjects" 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="https://www.python.org/">Python</a> »</li> <li> <a href="../index.html">Python 2.7.16 documentation</a> » </li> <li class="nav-item nav-item-1"><a href="index.html" >Python/C API Reference Manual</a> »</li> <li class="nav-item nav-item-2"><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" role="main"> <div class="section" id="capsules"> <span id="id1"></span><h1>Capsules<a class="headerlink" href="#capsules" title="Permalink to this headline">¶</a></h1> <p id="index-0">Refer to <a class="reference internal" href="../extending/extending.html#using-capsules"><span class="std std-ref">Providing a C API for an Extension Module</span></a> for more information on using these objects.</p> <div class="versionadded"> <p><span class="versionmodified">New in version 2.7.</span></p> </div> <dl class="type"> <dt id="c.PyCapsule"> <code class="descname">PyCapsule</code><a class="headerlink" href="#c.PyCapsule" title="Permalink to this definition">¶</a></dt> <dd><p>This subtype of <a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><code class="xref c c-type docutils literal notranslate"><span class="pre">PyObject</span></code></a> represents an opaque value, useful for C extension modules who need to pass an opaque value (as a <code class="xref c c-type docutils literal notranslate"><span class="pre">void*</span></code> 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.</p> </dd></dl> <dl class="type"> <dt id="c.PyCapsule_Destructor"> <code class="descname">PyCapsule_Destructor</code><a class="headerlink" href="#c.PyCapsule_Destructor" title="Permalink to this definition">¶</a></dt> <dd><p>The type of a destructor callback for a capsule. Defined as:</p> <div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="k">typedef</span> <span class="nf">void</span> <span class="p">(</span><span class="o">*</span><span class="n">PyCapsule_Destructor</span><span class="p">)(</span><span class="n">PyObject</span> <span class="o">*</span><span class="p">);</span> </pre></div> </div> <p>See <a class="reference internal" href="#c.PyCapsule_New" title="PyCapsule_New"><code class="xref c c-func docutils literal notranslate"><span class="pre">PyCapsule_New()</span></code></a> for the semantics of PyCapsule_Destructor callbacks.</p> </dd></dl> <dl class="function"> <dt id="c.PyCapsule_CheckExact"> int <code class="descname">PyCapsule_CheckExact</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *p</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyCapsule_CheckExact" title="Permalink to this definition">¶</a></dt> <dd><p>Return true if its argument is a <a class="reference internal" href="#c.PyCapsule" title="PyCapsule"><code class="xref c c-type docutils literal notranslate"><span class="pre">PyCapsule</span></code></a>.</p> </dd></dl> <dl class="function"> <dt id="c.PyCapsule_New"> <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a>* <code class="descname">PyCapsule_New</code><span class="sig-paren">(</span>void<em> *pointer</em>, const char<em> *name</em>, <a class="reference internal" href="#c.PyCapsule_Destructor" title="PyCapsule_Destructor">PyCapsule_Destructor</a><em> destructor</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyCapsule_New" title="Permalink to this definition">¶</a></dt> <dd><em class="refcount">Return value: New reference.</em><p>Create a <a class="reference internal" href="#c.PyCapsule" title="PyCapsule"><code class="xref c c-type docutils literal notranslate"><span class="pre">PyCapsule</span></code></a> encapsulating the <em>pointer</em>. The <em>pointer</em> argument may not be <em>NULL</em>.</p> <p>On failure, set an exception and return <em>NULL</em>.</p> <p>The <em>name</em> string may either be <em>NULL</em> or a pointer to a valid C string. If non-<em>NULL</em>, this string must outlive the capsule. (Though it is permitted to free it inside the <em>destructor</em>.)</p> <p>If the <em>destructor</em> argument is not <em>NULL</em>, it will be called with the capsule as its argument when it is destroyed.</p> <p>If this capsule will be stored as an attribute of a module, the <em>name</em> should be specified as <code class="docutils literal notranslate"><span class="pre">modulename.attributename</span></code>. This will enable other modules to import the capsule using <a class="reference internal" href="#c.PyCapsule_Import" title="PyCapsule_Import"><code class="xref c c-func docutils literal notranslate"><span class="pre">PyCapsule_Import()</span></code></a>.</p> </dd></dl> <dl class="function"> <dt id="c.PyCapsule_GetPointer"> void* <code class="descname">PyCapsule_GetPointer</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *capsule</em>, const char<em> *name</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyCapsule_GetPointer" title="Permalink to this definition">¶</a></dt> <dd><p>Retrieve the <em>pointer</em> stored in the capsule. On failure, set an exception and return <em>NULL</em>.</p> <p>The <em>name</em> parameter must compare exactly to the name stored in the capsule. If the name stored in the capsule is <em>NULL</em>, the <em>name</em> passed in must also be <em>NULL</em>. Python uses the C function <code class="xref c c-func docutils literal notranslate"><span class="pre">strcmp()</span></code> to compare capsule names.</p> </dd></dl> <dl class="function"> <dt id="c.PyCapsule_GetDestructor"> <a class="reference internal" href="#c.PyCapsule_Destructor" title="PyCapsule_Destructor">PyCapsule_Destructor</a> <code class="descname">PyCapsule_GetDestructor</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *capsule</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyCapsule_GetDestructor" title="Permalink to this definition">¶</a></dt> <dd><p>Return the current destructor stored in the capsule. On failure, set an exception and return <em>NULL</em>.</p> <p>It is legal for a capsule to have a <em>NULL</em> destructor. This makes a <em>NULL</em> return code somewhat ambiguous; use <a class="reference internal" href="#c.PyCapsule_IsValid" title="PyCapsule_IsValid"><code class="xref c c-func docutils literal notranslate"><span class="pre">PyCapsule_IsValid()</span></code></a> or <a class="reference internal" href="exceptions.html#c.PyErr_Occurred" title="PyErr_Occurred"><code class="xref c c-func docutils literal notranslate"><span class="pre">PyErr_Occurred()</span></code></a> to disambiguate.</p> </dd></dl> <dl class="function"> <dt id="c.PyCapsule_GetContext"> void* <code class="descname">PyCapsule_GetContext</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *capsule</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyCapsule_GetContext" title="Permalink to this definition">¶</a></dt> <dd><p>Return the current context stored in the capsule. On failure, set an exception and return <em>NULL</em>.</p> <p>It is legal for a capsule to have a <em>NULL</em> context. This makes a <em>NULL</em> return code somewhat ambiguous; use <a class="reference internal" href="#c.PyCapsule_IsValid" title="PyCapsule_IsValid"><code class="xref c c-func docutils literal notranslate"><span class="pre">PyCapsule_IsValid()</span></code></a> or <a class="reference internal" href="exceptions.html#c.PyErr_Occurred" title="PyErr_Occurred"><code class="xref c c-func docutils literal notranslate"><span class="pre">PyErr_Occurred()</span></code></a> to disambiguate.</p> </dd></dl> <dl class="function"> <dt id="c.PyCapsule_GetName"> const char* <code class="descname">PyCapsule_GetName</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *capsule</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyCapsule_GetName" title="Permalink to this definition">¶</a></dt> <dd><p>Return the current name stored in the capsule. On failure, set an exception and return <em>NULL</em>.</p> <p>It is legal for a capsule to have a <em>NULL</em> name. This makes a <em>NULL</em> return code somewhat ambiguous; use <a class="reference internal" href="#c.PyCapsule_IsValid" title="PyCapsule_IsValid"><code class="xref c c-func docutils literal notranslate"><span class="pre">PyCapsule_IsValid()</span></code></a> or <a class="reference internal" href="exceptions.html#c.PyErr_Occurred" title="PyErr_Occurred"><code class="xref c c-func docutils literal notranslate"><span class="pre">PyErr_Occurred()</span></code></a> to disambiguate.</p> </dd></dl> <dl class="function"> <dt id="c.PyCapsule_Import"> void* <code class="descname">PyCapsule_Import</code><span class="sig-paren">(</span>const char<em> *name</em>, int<em> no_block</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyCapsule_Import" title="Permalink to this definition">¶</a></dt> <dd><p>Import a pointer to a C object from a capsule attribute in a module. The <em>name</em> parameter should specify the full name to the attribute, as in <code class="docutils literal notranslate"><span class="pre">module.attribute</span></code>. The <em>name</em> stored in the capsule must match this string exactly. If <em>no_block</em> is true, import the module without blocking (using <a class="reference internal" href="import.html#c.PyImport_ImportModuleNoBlock" title="PyImport_ImportModuleNoBlock"><code class="xref c c-func docutils literal notranslate"><span class="pre">PyImport_ImportModuleNoBlock()</span></code></a>). If <em>no_block</em> is false, import the module conventionally (using <a class="reference internal" href="import.html#c.PyImport_ImportModule" title="PyImport_ImportModule"><code class="xref c c-func docutils literal notranslate"><span class="pre">PyImport_ImportModule()</span></code></a>).</p> <p>Return the capsule’s internal <em>pointer</em> on success. On failure, set an exception and return <em>NULL</em>.</p> </dd></dl> <dl class="function"> <dt id="c.PyCapsule_IsValid"> int <code class="descname">PyCapsule_IsValid</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *capsule</em>, const char<em> *name</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyCapsule_IsValid" title="Permalink to this definition">¶</a></dt> <dd><p>Determines whether or not <em>capsule</em> is a valid capsule. A valid capsule is non-<em>NULL</em>, passes <a class="reference internal" href="#c.PyCapsule_CheckExact" title="PyCapsule_CheckExact"><code class="xref c c-func docutils literal notranslate"><span class="pre">PyCapsule_CheckExact()</span></code></a>, has a non-<em>NULL</em> pointer stored in it, and its internal name matches the <em>name</em> parameter. (See <a class="reference internal" href="#c.PyCapsule_GetPointer" title="PyCapsule_GetPointer"><code class="xref c c-func docutils literal notranslate"><span class="pre">PyCapsule_GetPointer()</span></code></a> for information on how capsule names are compared.)</p> <p>In other words, if <a class="reference internal" href="#c.PyCapsule_IsValid" title="PyCapsule_IsValid"><code class="xref c c-func docutils literal notranslate"><span class="pre">PyCapsule_IsValid()</span></code></a> returns a true value, calls to any of the accessors (any function starting with <code class="xref c c-func docutils literal notranslate"><span class="pre">PyCapsule_Get()</span></code>) are guaranteed to succeed.</p> <p>Return a nonzero value if the object is valid and matches the name passed in. Return <code class="docutils literal notranslate"><span class="pre">0</span></code> otherwise. This function will not fail.</p> </dd></dl> <dl class="function"> <dt id="c.PyCapsule_SetContext"> int <code class="descname">PyCapsule_SetContext</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *capsule</em>, void<em> *context</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyCapsule_SetContext" title="Permalink to this definition">¶</a></dt> <dd><p>Set the context pointer inside <em>capsule</em> to <em>context</em>.</p> <p>Return <code class="docutils literal notranslate"><span class="pre">0</span></code> on success. Return nonzero and set an exception on failure.</p> </dd></dl> <dl class="function"> <dt id="c.PyCapsule_SetDestructor"> int <code class="descname">PyCapsule_SetDestructor</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *capsule</em>, <a class="reference internal" href="#c.PyCapsule_Destructor" title="PyCapsule_Destructor">PyCapsule_Destructor</a><em> destructor</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyCapsule_SetDestructor" title="Permalink to this definition">¶</a></dt> <dd><p>Set the destructor inside <em>capsule</em> to <em>destructor</em>.</p> <p>Return <code class="docutils literal notranslate"><span class="pre">0</span></code> on success. Return nonzero and set an exception on failure.</p> </dd></dl> <dl class="function"> <dt id="c.PyCapsule_SetName"> int <code class="descname">PyCapsule_SetName</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *capsule</em>, const char<em> *name</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyCapsule_SetName" title="Permalink to this definition">¶</a></dt> <dd><p>Set the name inside <em>capsule</em> to <em>name</em>. If non-<em>NULL</em>, the name must outlive the capsule. If the previous <em>name</em> stored in the capsule was not <em>NULL</em>, no attempt is made to free it.</p> <p>Return <code class="docutils literal notranslate"><span class="pre">0</span></code> on success. Return nonzero and set an exception on failure.</p> </dd></dl> <dl class="function"> <dt id="c.PyCapsule_SetPointer"> int <code class="descname">PyCapsule_SetPointer</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *capsule</em>, void<em> *pointer</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyCapsule_SetPointer" title="Permalink to this definition">¶</a></dt> <dd><p>Set the void pointer inside <em>capsule</em> to <em>pointer</em>. The pointer may not be <em>NULL</em>.</p> <p>Return <code class="docutils literal notranslate"><span class="pre">0</span></code> on success. Return nonzero and set an exception on failure.</p> </dd></dl> </div> </div> </div> </div> <div class="sphinxsidebar" role="navigation" aria-label="main navigation"> <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="cobject.html" title="next chapter">CObjects</a></p> <div role="note" aria-label="source link"> <h3>This Page</h3> <ul class="this-page-menu"> <li><a href="../_sources/c-api/capsule.rst.txt" rel="nofollow">Show Source</a></li> </ul> </div> <div id="searchbox" style="display: none" role="search"> <h3>Quick search</h3> <div class="searchformwrapper"> <form class="search" action="../search.html" method="get"> <input type="text" name="q" /> <input type="submit" value="Go" /> <input type="hidden" name="check_keywords" value="yes" /> <input type="hidden" name="area" value="default" /> </form> </div> </div> <script type="text/javascript">$('#searchbox').show(0);</script> </div> </div> <div class="clearer"></div> </div> <div class="related" role="navigation" aria-label="related navigation"> <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="../py-modindex.html" title="Python Module Index" >modules</a> |</li> <li class="right" > <a href="cobject.html" title="CObjects" >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="https://www.python.org/">Python</a> »</li> <li> <a href="../index.html">Python 2.7.16 documentation</a> » </li> <li class="nav-item nav-item-1"><a href="index.html" >Python/C API Reference Manual</a> »</li> <li class="nav-item nav-item-2"><a href="concrete.html" >Concrete Objects Layer</a> »</li> </ul> </div> <div class="footer"> © <a href="../copyright.html">Copyright</a> 1990-2019, Python Software Foundation. <br /> The Python Software Foundation is a non-profit corporation. <a href="https://www.python.org/psf/donations/">Please donate.</a> <br /> Last updated on Mar 27, 2019. <a href="../bugs.html">Found a bug</a>? <br /> Created using <a href="http://sphinx.pocoo.org/">Sphinx</a> 1.7.6. </div> </body> </html>
Save
cmd:
run