<!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>Old Buffer Protocol — Python 2.7.5 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: '2.7.5',
COLLAPSE_INDEX: false,
FILE_SUFFIX: '.html',
HAS_SOURCE: true
};
</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 2.7.5 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 2.7.5 documentation" href="../index.html" />
<link rel="up" title="Abstract Objects Layer" href="abstract.html" />
<link rel="next" title="Concrete Objects Layer" href="concrete.html" />
<link rel="prev" title="Iterator Protocol" href="iter.html" />
<link rel="shortcut icon" type="image/png" href="../_static/py.png" />
<script type="text/javascript" src="../_static/copybutton.js"></script>
</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="../py-modindex.html" title="Python Module Index"
>modules</a> |</li>
<li class="right" >
<a href="concrete.html" title="Concrete Objects Layer"
accesskey="N">next</a> |</li>
<li class="right" >
<a href="iter.html" title="Iterator Protocol"
accesskey="P">previous</a> |</li>
<li><img src="../_static/py.png" alt=""
style="vertical-align: middle; margin-top: -1px"/></li>
<li><a href="http://www.python.org/">Python</a> »</li>
<li>
<a href="../index.html">Python 2.7.5 documentation</a> »
</li>
<li><a href="index.html" >Python/C API Reference Manual</a> »</li>
<li><a href="abstract.html" accesskey="U">Abstract Objects Layer</a> »</li>
</ul>
</div>
<div class="document">
<div class="documentwrapper">
<div class="bodywrapper">
<div class="body">
<div class="section" id="old-buffer-protocol">
<span id="abstract-buffer"></span><h1>Old Buffer Protocol<a class="headerlink" href="#old-buffer-protocol" title="Permalink to this headline">¶</a></h1>
<p>This section describes the legacy buffer protocol, which has been introduced
in Python 1.6. It is still supported but deprecated in the Python 2.x series.
Python 3 introduces a new buffer protocol which fixes weaknesses and
shortcomings of the protocol, and has been backported to Python 2.6. See
<a class="reference internal" href="buffer.html#bufferobjects"><em>Buffers and Memoryview Objects</em></a> for more information.</p>
<dl class="function">
<dt id="PyObject_AsCharBuffer">
int <tt class="descname">PyObject_AsCharBuffer</tt><big>(</big><a class="reference internal" href="structures.html#PyObject" title="PyObject">PyObject</a><em> *obj</em>, const char<em> **buffer</em>, Py_ssize_t<em> *buffer_len</em><big>)</big><a class="headerlink" href="#PyObject_AsCharBuffer" title="Permalink to this definition">¶</a></dt>
<dd><p>Returns a pointer to a read-only memory location usable as character-based
input. The <em>obj</em> argument must support the single-segment character buffer
interface. On success, returns <tt class="docutils literal"><span class="pre">0</span></tt>, sets <em>buffer</em> to the memory location
and <em>buffer_len</em> to the buffer length. Returns <tt class="docutils literal"><span class="pre">-1</span></tt> and sets a
<a class="reference internal" href="../library/exceptions.html#exceptions.TypeError" title="exceptions.TypeError"><tt class="xref py py-exc docutils literal"><span class="pre">TypeError</span></tt></a> on error.</p>
<p class="versionadded">
<span class="versionmodified">New in version 1.6.</span></p>
<p class="versionchanged">
<span class="versionmodified">Changed in version 2.5: </span>This function used an <tt class="xref c c-type docutils literal"><span class="pre">int</span> <span class="pre">*</span></tt> type for <em>buffer_len</em>. This might
require changes in your code for properly supporting 64-bit systems.</p>
</dd></dl>
<dl class="function">
<dt id="PyObject_AsReadBuffer">
int <tt class="descname">PyObject_AsReadBuffer</tt><big>(</big><a class="reference internal" href="structures.html#PyObject" title="PyObject">PyObject</a><em> *obj</em>, const void<em> **buffer</em>, Py_ssize_t<em> *buffer_len</em><big>)</big><a class="headerlink" href="#PyObject_AsReadBuffer" title="Permalink to this definition">¶</a></dt>
<dd><p>Returns a pointer to a read-only memory location containing arbitrary data.
The <em>obj</em> argument must support the single-segment readable buffer
interface. On success, returns <tt class="docutils literal"><span class="pre">0</span></tt>, sets <em>buffer</em> to the memory location
and <em>buffer_len</em> to the buffer length. Returns <tt class="docutils literal"><span class="pre">-1</span></tt> and sets a
<a class="reference internal" href="../library/exceptions.html#exceptions.TypeError" title="exceptions.TypeError"><tt class="xref py py-exc docutils literal"><span class="pre">TypeError</span></tt></a> on error.</p>
<p class="versionadded">
<span class="versionmodified">New in version 1.6.</span></p>
<p class="versionchanged">
<span class="versionmodified">Changed in version 2.5: </span>This function used an <tt class="xref c c-type docutils literal"><span class="pre">int</span> <span class="pre">*</span></tt> type for <em>buffer_len</em>. This might
require changes in your code for properly supporting 64-bit systems.</p>
</dd></dl>
<dl class="function">
<dt id="PyObject_CheckReadBuffer">
int <tt class="descname">PyObject_CheckReadBuffer</tt><big>(</big><a class="reference internal" href="structures.html#PyObject" title="PyObject">PyObject</a><em> *o</em><big>)</big><a class="headerlink" href="#PyObject_CheckReadBuffer" title="Permalink to this definition">¶</a></dt>
<dd><p>Returns <tt class="docutils literal"><span class="pre">1</span></tt> if <em>o</em> supports the single-segment readable buffer interface.
Otherwise returns <tt class="docutils literal"><span class="pre">0</span></tt>.</p>
<p class="versionadded">
<span class="versionmodified">New in version 2.2.</span></p>
</dd></dl>
<dl class="function">
<dt id="PyObject_AsWriteBuffer">
int <tt class="descname">PyObject_AsWriteBuffer</tt><big>(</big><a class="reference internal" href="structures.html#PyObject" title="PyObject">PyObject</a><em> *obj</em>, void<em> **buffer</em>, Py_ssize_t<em> *buffer_len</em><big>)</big><a class="headerlink" href="#PyObject_AsWriteBuffer" title="Permalink to this definition">¶</a></dt>
<dd><p>Returns a pointer to a writeable memory location. The <em>obj</em> argument must
support the single-segment, character buffer interface. On success,
returns <tt class="docutils literal"><span class="pre">0</span></tt>, sets <em>buffer</em> to the memory location and <em>buffer_len</em> to the
buffer length. Returns <tt class="docutils literal"><span class="pre">-1</span></tt> and sets a <a class="reference internal" href="../library/exceptions.html#exceptions.TypeError" title="exceptions.TypeError"><tt class="xref py py-exc docutils literal"><span class="pre">TypeError</span></tt></a> on error.</p>
<p class="versionadded">
<span class="versionmodified">New in version 1.6.</span></p>
<p class="versionchanged">
<span class="versionmodified">Changed in version 2.5: </span>This function used an <tt class="xref c c-type docutils literal"><span class="pre">int</span> <span class="pre">*</span></tt> type for <em>buffer_len</em>. This might
require changes in your code for properly supporting 64-bit systems.</p>
</dd></dl>
</div>
</div>
</div>
</div>
<div class="sphinxsidebar">
<div class="sphinxsidebarwrapper">
<h4>Previous topic</h4>
<p class="topless"><a href="iter.html"
title="previous chapter">Iterator Protocol</a></p>
<h4>Next topic</h4>
<p class="topless"><a href="concrete.html"
title="next chapter">Concrete Objects Layer</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/objbuffer.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" />
<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="../py-modindex.html" title="Python Module Index"
>modules</a> |</li>
<li class="right" >
<a href="concrete.html" title="Concrete Objects Layer"
>next</a> |</li>
<li class="right" >
<a href="iter.html" title="Iterator Protocol"
>previous</a> |</li>
<li><img src="../_static/py.png" alt=""
style="vertical-align: middle; margin-top: -1px"/></li>
<li><a href="http://www.python.org/">Python</a> »</li>
<li>
<a href="../index.html">Python 2.7.5 documentation</a> »
</li>
<li><a href="index.html" >Python/C API Reference Manual</a> »</li>
<li><a href="abstract.html" >Abstract 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="http://www.python.org/psf/donations/">Please donate.</a>
<br />
Last updated on Jul 03, 2019.
<a href="../bugs.html">Found a bug</a>?
<br />
Created using <a href="http://sphinx.pocoo.org/">Sphinx</a> 1.1.3.
</div>
</body>
</html>| Name | Type | Size | Permission | Actions |
|---|---|---|---|---|
| abstract.html | File | 7.09 KB | 0644 |
|
| allocation.html | File | 16.94 KB | 0644 |
|
| arg.html | File | 55.63 KB | 0644 |
|
| bool.html | File | 9.24 KB | 0644 |
|
| buffer.html | File | 43.94 KB | 0644 |
|
| bytearray.html | File | 13.03 KB | 0644 |
|
| capsule.html | File | 19.04 KB | 0644 |
|
| cell.html | File | 10.36 KB | 0644 |
|
| class.html | File | 10.48 KB | 0644 |
|
| cobject.html | File | 11.06 KB | 0644 |
|
| code.html | File | 10.79 KB | 0644 |
|
| codec.html | File | 18.94 KB | 0644 |
|
| complex.html | File | 19.01 KB | 0644 |
|
| concrete.html | File | 15.16 KB | 0644 |
|
| conversion.html | File | 20.98 KB | 0644 |
|
| datetime.html | File | 23.48 KB | 0644 |
|
| descriptor.html | File | 10.97 KB | 0644 |
|
| dict.html | File | 29.9 KB | 0644 |
|
| exceptions.html | File | 75.95 KB | 0644 |
|
| file.html | File | 21.85 KB | 0644 |
|
| float.html | File | 15.85 KB | 0644 |
|
| function.html | File | 13.16 KB | 0644 |
|
| gcsupport.html | File | 20.25 KB | 0644 |
|
| gen.html | File | 7.92 KB | 0644 |
|
| import.html | File | 32.45 KB | 0644 |
|
| index.html | File | 12.55 KB | 0644 |
|
| init.html | File | 96.34 KB | 0644 |
|
| int.html | File | 18.31 KB | 0644 |
|
| intro.html | File | 62.21 KB | 0644 |
|
| iter.html | File | 9.16 KB | 0644 |
|
| iterator.html | File | 10.9 KB | 0644 |
|
| list.html | File | 22.27 KB | 0644 |
|
| long.html | File | 31.93 KB | 0644 |
|
| mapping.html | File | 14.41 KB | 0644 |
|
| marshal.html | File | 14.77 KB | 0644 |
|
| memory.html | File | 23.17 KB | 0644 |
|
| method.html | File | 12.47 KB | 0644 |
|
| module.html | File | 15.33 KB | 0644 |
|
| none.html | File | 7.39 KB | 0644 |
|
| number.html | File | 43.95 KB | 0644 |
|
| objbuffer.html | File | 11.26 KB | 0644 |
|
| object.html | File | 51.97 KB | 0644 |
|
| objimpl.html | File | 6.9 KB | 0644 |
|
| refcounting.html | File | 11.86 KB | 0644 |
|
| reflection.html | File | 9.82 KB | 0644 |
|
| sequence.html | File | 28.3 KB | 0644 |
|
| set.html | File | 28.22 KB | 0644 |
|
| slice.html | File | 11.19 KB | 0644 |
|
| string.html | File | 33.52 KB | 0644 |
|
| structures.html | File | 30.79 KB | 0644 |
|
| sys.html | File | 19.18 KB | 0644 |
|
| tuple.html | File | 19.49 KB | 0644 |
|
| type.html | File | 12.86 KB | 0644 |
|
| typeobj.html | File | 150.06 KB | 0644 |
|
| unicode.html | File | 105.59 KB | 0644 |
|
| utilities.html | File | 7.23 KB | 0644 |
|
| veryhigh.html | File | 40.2 KB | 0644 |
|
| weakref.html | File | 12.48 KB | 0644 |
|