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<H2><A NAME="SECTION0021610000000000000000"></A>
<BR>
16.1 AEServer Objects 
</H2>

<P>
<dl><dt><b><a name="l2h-264"><tt class=method>installaehandler</tt></a></b> (<var>classe, type, callback</var>)
<dd>
Installs an AppleEvent handler. <var>classe</var> and <var>type</var> are the
four-character OSA Class and Type designators, <tt>'****'</tt> wildcards
are allowed. When a matching AppleEvent is received the parameters are
decoded and your callback is invoked.
</dl>

<P>
<dl><dt><b><a name="l2h-265"><tt class=method>callback</tt></a></b> (<var>_object, **kwargs</var>)
<dd>
Your callback is called with the OSA Direct Object as first positional
parameter. The other parameters are passed as keyword arguments, with
the 4-character designator as name. Three extra keyword parameters are
passed: <tt>_class</tt> and <tt>_type</tt> are the Class and Type
designators and <tt>_attributes</tt> is a dictionary with the AppleEvent
attributes.

<P>
The return value of your method is packed with
<tt class=function>aetools.packevent()</tt> and sent as reply.
</dl>

<P>
Note that there are some serious problems with the current
design. AppleEvents which have non-identifier 4-character designators
for arguments are not implementable, and it is not possible to return
an error to the originator. This will be addressed in a future
release.

<P>
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