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  <section id="pickle-buffer-objects">
<span id="index-0"></span><span id="picklebuffer-objects"></span><h1>Pickle buffer objects<a class="headerlink" href="#pickle-buffer-objects" title="Link to this heading">¶</a></h1>
<div class="versionadded">
<p><span class="versionmodified added">Added in version 3.8.</span></p>
</div>
<p>A <a class="reference internal" href="../library/pickle.html#pickle.PickleBuffer" title="pickle.PickleBuffer"><code class="xref py py-class docutils literal notranslate"><span class="pre">pickle.PickleBuffer</span></code></a> object wraps a <a class="reference internal" href="buffer.html#bufferobjects"><span class="std std-ref">buffer-providing object</span></a> for out-of-band data transfer with the <a class="reference internal" href="../library/pickle.html#module-pickle" title="pickle: Convert Python objects to streams of bytes and back."><code class="xref py py-mod docutils literal notranslate"><span class="pre">pickle</span></code></a> module.</p>
<dl class="c var">
<dt class="sig sig-object c" id="c.PyPickleBuffer_Type">
<a class="reference internal" href="type.html#c.PyTypeObject" title="PyTypeObject"><span class="n"><span class="pre">PyTypeObject</span></span></a><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyPickleBuffer_Type</span></span></span><a class="headerlink" href="#c.PyPickleBuffer_Type" title="Link to this definition">¶</a><br /></dt>
<dd><p>This instance of <a class="reference internal" href="type.html#c.PyTypeObject" title="PyTypeObject"><code class="xref c c-type docutils literal notranslate"><span class="pre">PyTypeObject</span></code></a> represents the Python pickle buffer type.
This is the same object as <a class="reference internal" href="../library/pickle.html#pickle.PickleBuffer" title="pickle.PickleBuffer"><code class="xref py py-class docutils literal notranslate"><span class="pre">pickle.PickleBuffer</span></code></a> in the Python layer.</p>
</dd></dl>

<dl class="c function">
<dt class="sig sig-object c" id="c.PyPickleBuffer_Check">
<span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyPickleBuffer_Check</span></span></span><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">op</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyPickleBuffer_Check" title="Link to this definition">¶</a><br /></dt>
<dd><p>Return true if <em>op</em> is a pickle buffer instance.
This function always succeeds.</p>
</dd></dl>

<dl class="c function">
<dt class="sig sig-object c" id="c.PyPickleBuffer_FromObject">
<a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="sig-name descname"><span class="n"><span class="pre">PyPickleBuffer_FromObject</span></span></span><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">obj</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyPickleBuffer_FromObject" title="Link to this definition">¶</a><br /></dt>
<dd><p>Create a pickle buffer from the object <em>obj</em>.</p>
<p>This function will fail if <em>obj</em> doesn’t support the <a class="reference internal" href="buffer.html#bufferobjects"><span class="std std-ref">buffer protocol</span></a>.</p>
<p>On success, return a new pickle buffer instance.
On failure, set an exception and return <code class="docutils literal notranslate"><span class="pre">NULL</span></code>.</p>
<p>Analogous to calling <a class="reference internal" href="../library/pickle.html#pickle.PickleBuffer" title="pickle.PickleBuffer"><code class="xref py py-class docutils literal notranslate"><span class="pre">pickle.PickleBuffer</span></code></a> with <em>obj</em> in Python.</p>
</dd></dl>

<dl class="c function">
<dt class="sig sig-object c" id="c.PyPickleBuffer_GetBuffer">
<span class="k"><span class="pre">const</span></span><span class="w"> </span><a class="reference internal" href="buffer.html#c.Py_buffer" title="Py_buffer"><span class="n"><span class="pre">Py_buffer</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="sig-name descname"><span class="n"><span class="pre">PyPickleBuffer_GetBuffer</span></span></span><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">picklebuf</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyPickleBuffer_GetBuffer" title="Link to this definition">¶</a><br /></dt>
<dd><p>Get a pointer to the underlying <a class="reference internal" href="buffer.html#c.Py_buffer" title="Py_buffer"><code class="xref c c-type docutils literal notranslate"><span class="pre">Py_buffer</span></code></a> that the pickle buffer wraps.</p>
<p>The returned pointer is valid as long as <em>picklebuf</em> is alive and has not been
released. The caller must not modify or free the returned <a class="reference internal" href="buffer.html#c.Py_buffer" title="Py_buffer"><code class="xref c c-type docutils literal notranslate"><span class="pre">Py_buffer</span></code></a>.
If the pickle buffer has been released, raise <a class="reference internal" href="../library/exceptions.html#ValueError" title="ValueError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">ValueError</span></code></a>.</p>
<p>On success, return a pointer to the buffer view.
On failure, set an exception and return <code class="docutils literal notranslate"><span class="pre">NULL</span></code>.</p>
</dd></dl>

<dl class="c function">
<dt class="sig sig-object c" id="c.PyPickleBuffer_Release">
<span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyPickleBuffer_Release</span></span></span><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject"><span class="n"><span class="pre">PyObject</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">picklebuf</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyPickleBuffer_Release" title="Link to this definition">¶</a><br /></dt>
<dd><p>Release the underlying buffer held by the pickle buffer.</p>
<p>Return <code class="docutils literal notranslate"><span class="pre">0</span></code> on success. On failure, set an exception and return <code class="docutils literal notranslate"><span class="pre">-1</span></code>.</p>
<p>Analogous to calling <a class="reference internal" href="../library/pickle.html#pickle.PickleBuffer.release" title="pickle.PickleBuffer.release"><code class="xref py py-meth docutils literal notranslate"><span class="pre">pickle.PickleBuffer.release()</span></code></a> in Python.</p>
</dd></dl>

</section>


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