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:mod:`aepack` --- Conversion between Python variables and AppleEvent data containers
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====================================================================================
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.. module:: aepack
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:platform: Mac
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:synopsis: Conversion between Python variables and AppleEvent data containers.
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.. sectionauthor:: Vincent Marchetti <vincem@en.com>
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.. moduleauthor:: Jack Jansen
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The :mod:`aepack` module defines functions for converting (packing) Python
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variables to AppleEvent descriptors and back (unpacking). Within Python the
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AppleEvent descriptor is handled by Python objects of built-in type
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:class:`AEDesc`, defined in module :mod:`Carbon.AE`.
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The :mod:`aepack` module defines the following functions:
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.. function:: pack(x[, forcetype])
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Returns an :class:`AEDesc` object containing a conversion of Python value x. If
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*forcetype* is provided it specifies the descriptor type of the result.
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Otherwise, a default mapping of Python types to Apple Event descriptor types is
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used, as follows:
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+-----------------+-----------------------------------+
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| Python type | descriptor type |
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+=================+===================================+
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| :class:`FSSpec` | typeFSS |
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+-----------------+-----------------------------------+
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| :class:`FSRef` | typeFSRef |
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+-----------------+-----------------------------------+
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| :class:`Alias` | typeAlias |
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+-----------------+-----------------------------------+
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| integer | typeLong (32 bit integer) |
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+-----------------+-----------------------------------+
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| float | typeFloat (64 bit floating point) |
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+-----------------+-----------------------------------+
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| string | typeText |
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+-----------------+-----------------------------------+
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| unicode | typeUnicodeText |
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+-----------------+-----------------------------------+
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| list | typeAEList |
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+-----------------+-----------------------------------+
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| dictionary | typeAERecord |
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+-----------------+-----------------------------------+
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| instance | *see below* |
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+-----------------+-----------------------------------+
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If *x* is a Python instance then this function attempts to call an
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:meth:`__aepack__` method. This method should return an :class:`AEDesc` object.
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If the conversion *x* is not defined above, this function returns the Python
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string representation of a value (the repr() function) encoded as a text
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descriptor.
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.. function:: unpack(x[, formodulename])
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*x* must be an object of type :class:`AEDesc`. This function returns a Python
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object representation of the data in the Apple Event descriptor *x*. Simple
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AppleEvent data types (integer, text, float) are returned as their obvious
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Python counterparts. Apple Event lists are returned as Python lists, and the
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list elements are recursively unpacked. Object references (ex. ``line 3 of
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document 1``) are returned as instances of :class:`aetypes.ObjectSpecifier`,
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unless ``formodulename`` is specified. AppleEvent descriptors with descriptor
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type typeFSS are returned as :class:`FSSpec` objects. AppleEvent record
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descriptors are returned as Python dictionaries, with 4-character string keys
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and elements recursively unpacked.
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The optional ``formodulename`` argument is used by the stub packages generated
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by :mod:`gensuitemodule`, and ensures that the OSA classes for object specifiers
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are looked up in the correct module. This ensures that if, say, the Finder
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returns an object specifier for a window you get an instance of
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``Finder.Window`` and not a generic ``aetypes.Window``. The former knows about
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all the properties and elements a window has in the Finder, while the latter
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knows no such things.
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.. seealso::
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Module :mod:`Carbon.AE`
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Built-in access to Apple Event Manager routines.
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Module :mod:`aetypes`
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Python definitions of codes for Apple Event descriptor types.
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`Inside Macintosh: Interapplication Communication <http://developer.apple.com/techpubs/mac/IAC/IAC-2.html>`_
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Information about inter-process communications on the Macintosh.
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