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<div class="section" id="module-aepack">
<h1>37.3. <tt class="xref docutils literal"><span class="pre">aepack</span></tt> — Conversion between Python variables and AppleEvent data containers<a class="headerlink" href="#module-aepack" title="Permalink to this headline">¶</a></h1>
<p><em>Platforms: </em>Mac</p>
<p>The <tt class="xref docutils literal"><span class="pre">aepack</span></tt> module defines functions for converting (packing) Python
variables to AppleEvent descriptors and back (unpacking). Within Python the
AppleEvent descriptor is handled by Python objects of built-in type
<tt class="xref docutils literal"><span class="pre">AEDesc</span></tt>, defined in module <a title="(Mac) Interface to the Apple Events toolbox. (deprecated)" class="reference external" href="carbon.html#module-Carbon.AE"><tt class="xref docutils literal"><span class="pre">Carbon.AE</span></tt></a>.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">This module has been removed in Python 3.x.</p>
</div>
<p>The <tt class="xref docutils literal"><span class="pre">aepack</span></tt> module defines the following functions:</p>
<dl class="function">
<dt id="aepack.pack">
<tt class="descclassname">aepack.</tt><tt class="descname">pack</tt><big>(</big><em>x</em><span class="optional">[</span>, <em>forcetype</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#aepack.pack" title="Permalink to this definition">¶</a></dt>
<dd><p>Returns an <tt class="xref docutils literal"><span class="pre">AEDesc</span></tt> object containing a conversion of Python value x. If
<em>forcetype</em> is provided it specifies the descriptor type of the result.
Otherwise, a default mapping of Python types to Apple Event descriptor types is
used, as follows:</p>
<table border="1" class="docutils">
<colgroup>
<col width="33%" />
<col width="67%" />
</colgroup>
<thead valign="bottom">
<tr><th class="head">Python type</th>
<th class="head">descriptor type</th>
</tr>
</thead>
<tbody valign="top">
<tr><td><tt class="xref docutils literal"><span class="pre">FSSpec</span></tt></td>
<td>typeFSS</td>
</tr>
<tr><td><tt class="xref docutils literal"><span class="pre">FSRef</span></tt></td>
<td>typeFSRef</td>
</tr>
<tr><td><tt class="xref docutils literal"><span class="pre">Alias</span></tt></td>
<td>typeAlias</td>
</tr>
<tr><td>integer</td>
<td>typeLong (32 bit integer)</td>
</tr>
<tr><td>float</td>
<td>typeFloat (64 bit floating point)</td>
</tr>
<tr><td>string</td>
<td>typeText</td>
</tr>
<tr><td>unicode</td>
<td>typeUnicodeText</td>
</tr>
<tr><td>list</td>
<td>typeAEList</td>
</tr>
<tr><td>dictionary</td>
<td>typeAERecord</td>
</tr>
<tr><td>instance</td>
<td><em>see below</em></td>
</tr>
</tbody>
</table>
<p>If <em>x</em> is a Python instance then this function attempts to call an
<tt class="xref docutils literal"><span class="pre">__aepack__()</span></tt> method. This method should return an <tt class="xref docutils literal"><span class="pre">AEDesc</span></tt> object.</p>
<p>If the conversion <em>x</em> is not defined above, this function returns the Python
string representation of a value (the repr() function) encoded as a text
descriptor.</p>
</dd></dl>
<dl class="function">
<dt id="aepack.unpack">
<tt class="descclassname">aepack.</tt><tt class="descname">unpack</tt><big>(</big><em>x</em><span class="optional">[</span>, <em>formodulename</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#aepack.unpack" title="Permalink to this definition">¶</a></dt>
<dd><p><em>x</em> must be an object of type <tt class="xref docutils literal"><span class="pre">AEDesc</span></tt>. This function returns a Python
object representation of the data in the Apple Event descriptor <em>x</em>. Simple
AppleEvent data types (integer, text, float) are returned as their obvious
Python counterparts. Apple Event lists are returned as Python lists, and the
list elements are recursively unpacked. Object references (ex. <tt class="docutils literal"><span class="pre">line</span> <span class="pre">3</span> <span class="pre">of</span>
<span class="pre">document</span> <span class="pre">1</span></tt>) are returned as instances of <a title="aetypes.ObjectSpecifier" class="reference external" href="aetypes.html#aetypes.ObjectSpecifier"><tt class="xref docutils literal"><span class="pre">aetypes.ObjectSpecifier</span></tt></a>,
unless <tt class="docutils literal"><span class="pre">formodulename</span></tt> is specified. AppleEvent descriptors with descriptor
type typeFSS are returned as <tt class="xref docutils literal"><span class="pre">FSSpec</span></tt> objects. AppleEvent record
descriptors are returned as Python dictionaries, with 4-character string keys
and elements recursively unpacked.</p>
<p>The optional <tt class="docutils literal"><span class="pre">formodulename</span></tt> argument is used by the stub packages generated
by <a title="(Mac) Create a stub package from an OSA dictionary" class="reference external" href="gensuitemodule.html#module-gensuitemodule"><tt class="xref docutils literal"><span class="pre">gensuitemodule</span></tt></a>, and ensures that the OSA classes for object specifiers
are looked up in the correct module. This ensures that if, say, the Finder
returns an object specifier for a window you get an instance of
<tt class="docutils literal"><span class="pre">Finder.Window</span></tt> and not a generic <tt class="docutils literal"><span class="pre">aetypes.Window</span></tt>. The former knows about
all the properties and elements a window has in the Finder, while the latter
knows no such things.</p>
</dd></dl>
<div class="admonition-see-also admonition seealso">
<p class="first admonition-title">See also</p>
<dl class="last docutils">
<dt>Module <a title="(Mac) Interface to the Apple Events toolbox. (deprecated)" class="reference external" href="carbon.html#module-Carbon.AE"><tt class="xref docutils literal"><span class="pre">Carbon.AE</span></tt></a></dt>
<dd>Built-in access to Apple Event Manager routines.</dd>
<dt>Module <a title="(Mac) Python representation of the Apple Event Object Model. (deprecated)" class="reference external" href="aetypes.html#module-aetypes"><tt class="xref docutils literal"><span class="pre">aetypes</span></tt></a></dt>
<dd>Python definitions of codes for Apple Event descriptor types.</dd>
</dl>
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