Rewritten, clarified, corrected and cleaned up by Michael J. Barber.
This commit is contained in:
Jack Jansen
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<HTML><HEAD><TITLE>Using Open Scripting Extension from Python</TITLE></HEAD>
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<BODY>
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<H1>Using Open Scripting Extension from Python</H1>
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<HR>
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<!doctype HTML PUBLIC "-//W3C//DTD HTML 4.01//EN">
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<html><head><title>Using the Open Scripting Architecture from Python</title></head>
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<body>
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<h1>Using the Open Scripting Architecture from Python</h1>
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<hr>
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OSA support in Python is still not 100% complete, but
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<p>OSA support in Python is still not 100% complete, but
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there is already enough in place to allow you to do some nifty things
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to other programs from your python program. <P>
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with other programs from your python program. </p>
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<CITE>
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Actually, when we say "AppleScript" in this document we actually mean
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"the Open Scripting Architecture", there is nothing
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AppleScript-specific in the Python implementation. <p>
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</CITE>
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<p>
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In this example, we will look at a scriptable application, extract its
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"AppleScript Dictionary" and generate a Python interface module from
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that and use that module to control the application. Because we want
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to concentrate on the OSA details we don't bother with a real
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user-interface for our application. <p>
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“AppleScript Dictionary,” generate a Python interface package from
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the dictionary, and use that package to control the application.
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The application we are going to script is Disk Copy, Apple's standard
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utility for making copies of floppies, creating files that are mountable
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as disk images, etc. <p>
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as disk images, etc.
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Because we want
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to concentrate on the OSA details, we won’t bother with a real
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user-interface for our application. </p>
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<H2>Python OSA architecture</H2>
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Open Scripting suites and inheritance can be modelled rather nicely with
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with Python packages, so for each application we want to script we generate
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a package. Each suite defined in the application becomes a module in the
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<p>
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<em>When we say “AppleScript” in this document we actually mean
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“the Open Scripting Architecture.” There is nothing
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AppleScript-specific in the Python implementation. Most of this document
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focuses on the classic Mac OS; <a href="#osx">Mac OS X</a> users have some
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additional tools.</em>
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</p>
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<h2>Python OSA architecture</h2>
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<p>Open Scripting suites and inheritance can be modelled rather nicely
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with Python packages, so we generate
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a package for each application we want to script. Each suite defined in
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the application becomes a module in the
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package, and the package main module imports everything from all the
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submodules and glues all the classes (Python terminology, OSA terminology is
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events, AppleScript terminology is verbs) together. <p>
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submodules and glues together all the classes (in Python terminology—
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events in OSA terminology or verbs in AppleScript terminology). </p>
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<p>
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A suite in an OSA application can extend the functionality of a standard
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suite, and this is implemented in Python by importing everything from the
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module that implements the standard suite and overriding anything that has
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been extended. The standard suites live in the StdSuite package. <p>
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suite. This is implemented in Python by importing everything from the
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module that implements the standard suites and overriding anything that has
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been extended. The standard suites live in the StdSuite package. </p>
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This all sounds complicated, and you can do strange and wondrous things
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with it once you fully understand it, but the good news is that simple
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scripting is actually pretty simple. <p>
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<p>
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This all sounds complicated, but the good news is that basic
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scripting is actually pretty simple. You can do strange and wondrous things
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with OSA scripting once you fully understand it. </p>
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<H2>Creating the Python interface module</H2>
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<h2>Creating the Python interface package</h2>
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There is a tool in the standard distribution that looks through a file
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for an 'AETE' or 'AEUT' resource, the internal representation of the
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AppleScript dictionary. This tool is called
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<CODE>gensuitemodule.py</CODE>, and lives in <CODE>Mac:scripts</CODE>.
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When we start it, it asks us for an input file and we point it to the
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Disk Copy executable. <p>
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Next it wants a folder where it will store the package it is going to generate.
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<p>There is a tool in the standard distribution that can automatically
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generate the interface packages. This tool is called
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<code>gensuitemodule.py</code>, and lives in <code>Mac:scripts</code>.
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It looks through a file
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for an ‘AETE’ or ‘AEUT’ resource,
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the internal representation of the
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AppleScript dictionary, and parses the resource to generate the suite
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modules.
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When we start <code>gensuitemodule</code>, it asks us for an input file;
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for our example,
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we point it to the Disk Copy executable. </p>
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<p>
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Next, <code>gensuitemodule</code> wants a folder where it will store the
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package it is going to generate.
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Note that this is the package folder, not the parent folder, so we
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navigate to <code>Python:Mac:Demo:applescript</code>, create a folder
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<code>Disk_Copy</code> and select that. <p>
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<code>Disk_Copy</code>, and select that. </p>
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Next it wants the folder from which it should import the standard suites. Here
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you always select <code>Python:Mac:Lib:lib-scriptpackages</code>. (There is
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<p>
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We next specify the folder from which <code>gensuitemodule</code>
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should import the standard suites. Here,
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we always select <code>Python:Mac:Lib:lib-scriptpackages:StdSuites</code>. (There is
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one exception to this rule: when you are generating <code>StdSuites</code> itself
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you select <code>cancel</code>, for obvious reasons). <p>
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<!-- you select <code>cancel</code>.) -->
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you select <code>_builtinSuites</code>.)
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</p>
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<p>
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It starts parsing the AETE resource, and for
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each AppleEvent suite it finds it prompts us for the filename of the
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each AppleEvent suite it finds, <code>gensuitemodule.py</code>
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prompts us for the filename of the
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resulting python module. Remember to change folders for the first
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module, you don't want to clutter up the Eudora folder with your python
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interfaces. If you want to skip a suite you press cancel and the process
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continues with the next suite. <p>
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module—you don't want to clutter up, say, the
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Eudora folder
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<!--Why Eudora folder? Was there an earlier example featuring Eudora?
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Added "say" to make it seem less specific.-->
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with your python
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interfaces. If you want to skip a suite, press <code>cancel</code> and the process
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continues with the next suite. </p>
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Gensuitemodule may ask you questions like "Where is enum 'xyz ' declared?".
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This is either due to a misunderstanding on my part or (rather too common)
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<h3>Summary</h3>
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<ol>
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<li>Run <code>gensuitemodule</code>.</li>
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<li>Select the application (or OSAX) for which you would like a Python interface.</li>
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<li>Select the package folder where the interface modules should be
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stored.</li>
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<li>Specify the folder <code>Python:Mac:Lib:lib-scriptpackages:StdSuites</code>
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<!-- to import the standard suites (or <code>cancel</code> if you are -->
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to import the standard suites (or <code>_builtinSuites</code> if you are
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generating <code>StdSuites</code> itself). </li>
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<li>Save the generated suites (use <code>cancel</code> to skip a suite).</li>
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</ol>
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<h3>Notes</h3>
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<ul>
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<li>The interface package may need some editing by hand. For example,
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<code>gensuitemodule</code> does not handle all Python reserved words, so
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if
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one of the AppleScript verbs is a Python reserved word, a <code>SyntaxError</code>
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may be raised when the package is imported.
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Simply rename the class into something acceptable, if this happens;
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take a look at how the
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<code>print</code> verb is handled (automatically by <code>gensuitemodule</code>)
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in the standard suites. </li>
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<li>If you want to re-create the StdSuite modules,
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you should look in one of two places. With versions of AppleScript older than 1.4.0
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(which first shipped with OS 9.0), you will find the
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AEUT resources in <code>System Folder:Extensions:Scripting
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Additions:Dialects:English Dialect</code>. For newer versions, you will
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find them in <code>System Folder:Extensions:Applescript</code>.
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</li>
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<li>Since MacPython 2.0, this new structure, with packages
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per application and submodules per suite, is used. Older MacPythons had a
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single level of modules, with uncertain semantics. With the new structure,
|
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it is possible for programs to override standard suites, as programs often do.
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It is a good idea to convert your own old programs to the new scheme.
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<!-- , but if you -->
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<!-- really want them, the old standard suites are still available in -->
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<!-- <code>:Mac:Lib:lib-scripting</code>. -->
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<!-- Seems to be gone in MacPython 2.2 -->
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</li>
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<li><code>Gensuitemodule.py</code> may ask you questions
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like “Where is enum 'xyz ' declared?”.
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This is either due to a misunderstanding on my part or (rather too commonly)
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bugs in the AETE resources. Pressing <code>cancel</code> is usually the
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right option, it will cause the specific enum not to be treated as an enum
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but as a "normal" type. As things like fsspecs and TEXT strings clearly are
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not enumerators this is correct. If someone understands what is really going on
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here please let me know. <p>
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right choice: it will cause the specific enum not to be treated as an enum
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but as a “normal” type. As things like fsspecs and TEXT strings clearly are
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not enumerators, this is correct. If someone understands what is really going on
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here, please let me know.</li>
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<BLOCKQUOTE>
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Time for a sidebar. If you want to re-create the StdSuite modules
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you should look in one of two places. On older systems you will find the
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AEUT resources in <CODE>System Folder:Extensions:Scripting
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Additions:Dialects:English Dialect</CODE>. On newer systems you will
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find them in <code>System Folder:Extensions:Applescript</code>. <p>
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</BLOCKQUOTE>
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</ul>
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Let's glance at the <A
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HREF="applescript/Disk_Copy">Disk_Copy</A> package just created. You
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may want to open Script Editor alongside, and have a look at how it
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interprets the dictionary. The main package module is in <code>__init__.py</code>
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and the only interesting bit is the <code>Disk_Copy</code> class, which
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<h2>The Python interface package contents</h2>
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<p>
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Let’s glance at the
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<a href="applescript/Disk_Copy">Disk_Copy</a> package just created. You
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may want to open Script Editor alongside to see how it
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interprets the dictionary.
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</p>
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<p>
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The main package module is in <code>__init__.py</code>.
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The only interesting bit is the <code>Disk_Copy</code> class, which
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includes the event handling classes from the individual suites. It also
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inherits <code>aetools.TalkTo</code>, which is a base class that handles all
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details on how to start the program and talk to it, and a class variable
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<code>_signature</code> which is the default application this class will talk
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to (you can override this in various when you instantiate your class, see
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to (you can override this in various ways when you instantiate your class, see
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<code>aetools.py</code> for details).
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<p>
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<blockquote>
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Let us do another sidebar. Since MacPython 2.0 this new structure, with packages
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per application and submodules per suite, is used. Older MacPythons had a
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single level of modules, with uncertain semantics. With the new structure
|
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it is possible for programs to override standard suites, as programs often do.
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It is a good idea to convert your own old programs to the new scheme, but if you
|
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really want the old standard suites are still available in
|
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<code>:Mac:Lib:lib-scripting</code>.
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</blockquote>
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</p>
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<p>
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The <a href="applescript/Disk_Copy/Special_Events.py">Special_Events</a>
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module is a nice example of a suite module.
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The <CODE>Special_Events_Events</CODE> class is the bulk of the code
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generated. For each verb it contains a method. Each method knows what
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arguments the verb expects, and it makes handy use of keyword
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The <code>Special_Events_Events</code> class is the bulk of the code
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generated. For each verb, it contains a method. Each method knows what
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arguments the verb expects, and it makes use of keyword
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arguments to present a palatable
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interface to the python programmer. You will see that each method
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calls some routines from <CODE>aetools</CODE>, an auxiliary module
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living in <CODE>Lib:toolbox</CODE> which contains some other nifty
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AppleEvent tools as well. Have a look at it sometime, there is (of
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course) no documentation yet. <p>
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interface to the python programmer.
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The other thing you notice is that each method calls
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<CODE>self.send</CODE>, this comes from the <code>aetools.TalkTo</code> baseclass. <p>
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Notice that each method
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calls some routines from <code>aetools</code>, an auxiliary module
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living in <code>Mac:Lib</code>.
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The other thing to notice is that each method calls
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<code>self.send</code>. This comes from the <code>aetools.TalkTo</code>
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baseclass. </p>
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After the big class we get a number of little class declarations. These
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declarations are for the (appleevent) classes and properties in the suite.
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<p>
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After the big class, there are a number of little class declarations. These
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declarations are for the (AppleEvent) classes and properties in the suite.
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They allow you to create object IDs, which can then be passed to the verbs.
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For instance, to get the name of the sender of the first message in mailbox
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inbox you would use <code>mailbox("inbox").message(1).sender</code>. It is
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For instance,
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<!--Is this for Eudora again? I'll assume so...-->
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when scripting the popular email program Eudora,
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you would use <code>mailbox("inbox").message(1).sender</code>
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to get the name of the sender of the first message in mailbox
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inbox. It is
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also possible to specify this as <code>sender(message(1, mailbox("inbox")))</code>,
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which is sometimes needed because these classes don't always inherit correctly
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from baseclasses, so you may have to use a class or property from another suite. <p>
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|
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<blockquote>
|
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There are also some older object specifiers for standard objects in aetools.
|
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You use these in the form <CODE>aetools.Word(10,
|
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aetools.Document(1))</CODE> where the corresponding AppleScript
|
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terminology would be <CODE>word 10 of the first
|
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document</CODE>. Examine the two modules mentioned above along with
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the comments at the end of your suite module if you need to create
|
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more than the standard object specifiers.
|
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</blockquote>
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which is sometimes needed because these classes don’t always inherit correctly
|
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from baseclasses, so you may have to use a class or property from another
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suite. </p>
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|
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<p>
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Next we get the enumeration dictionaries, which allow you to pass
|
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english names as arguments to verbs, so you don't have to bother with the 4-letter
|
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type code. So, you can say
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<CODE><PRE>
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<code>
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diskcopy.create(..., filesystem="Mac OS Standard")
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</PRE></CODE>
|
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as it is called in Script Editor, in stead of the cryptic lowlevel
|
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<CODE><PRE>
|
||||
</code>
|
||||
as it is called in Script Editor, instead of the cryptic lowlevel
|
||||
<code>
|
||||
diskcopy.create(..., filesystem="Fhfs")
|
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</PRE></CODE><p>
|
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</code></p>
|
||||
|
||||
Finally, we get the "table of contents" of the module, listing all classes and such
|
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by code, which is used by gensuitemodule. <p>
|
||||
<p>
|
||||
Finally, we get the “table of contents” of the module, listing all
|
||||
classes and such
|
||||
by code, which is used by <code>gensuitemodule</code>.
|
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<!--
|
||||
| Not sure I understand. Is the code used by gensuitemodule, or is the TOC
|
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| module used by gensuitemodule?
|
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-->
|
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</p>
|
||||
|
||||
<H2>Using a Python suite module</H2>
|
||||
<h3>Notes</h3>
|
||||
|
||||
Now that we have created the suite module we can use it in a Python script.
|
||||
<ul>
|
||||
|
||||
<li>The <code>aetools</code> module contains some other nifty
|
||||
AppleEvent tools as well. Have a look at it sometime, there is (of
|
||||
course) no documentation yet.
|
||||
</li>
|
||||
|
||||
<li>There are also some older object specifiers for standard objects in aetools.
|
||||
You use these in the form <code>aetools.Word(10,
|
||||
aetools.Document(1))</code>, where the corresponding AppleScript
|
||||
terminology would be <code>word 10 of the first
|
||||
document</code>. Examine
|
||||
<code>aetools</code> and <code>aetools.TalkTo</code>
|
||||
along with
|
||||
the comments at the end of your suite module if you need to create
|
||||
more than the standard object specifiers.
|
||||
</li>
|
||||
|
||||
</ul>
|
||||
|
||||
|
||||
|
||||
|
||||
<h2>Using a Python suite module</h2>
|
||||
|
||||
<p>
|
||||
Now that we have created the suite module, we can use it in a Python script.
|
||||
In older MacPython distributions this used to be a rather
|
||||
complicated affair, but with the package scheme and with the application signature
|
||||
known by the package it is very simple: you import the package and instantiate
|
||||
the class, as
|
||||
<CODE><PRE>
|
||||
the class, e.g.
|
||||
<code>
|
||||
talker = Disk_Copy.Disk_Copy(start=1)
|
||||
</PRE></CODE>
|
||||
You will usually specify the start=1: it will run the application if it is
|
||||
not already running. You may want to omit it if you want to talk to the application
|
||||
only if it is already running, or if the application is something like the Finder. <p>
|
||||
</code>
|
||||
You will usually specify the <code>start=1</code>: it will run the application if it is
|
||||
not already running.
|
||||
You may want to omit it if you want to talk to the application
|
||||
only if it is already running, or if the application is something like the Finder.
|
||||
Another way to ensure that the application is running is to call <code>talker.start()</code>.
|
||||
</p>
|
||||
|
||||
Looking at the sourcefile <A
|
||||
HREF="applescript/makedisk.py">makedisk.py</A> we see that it starts
|
||||
with some imports.
|
||||
<p>
|
||||
Looking at the sourcefile <a
|
||||
href="applescript/makedisk.py">makedisk.py</a>, we see that it starts
|
||||
with some imports. Naturally, one of these is the Python interface to Disk
|
||||
Copy.</p>
|
||||
|
||||
The main program itself is a wonder of simplicity. We create the
|
||||
object that talks to Disk Copy, creates a disk and mounts it. <p>
|
||||
<p>
|
||||
The main program itself is a wonder of simplicity: we create the
|
||||
object (<code>talker</code>) that talks to Disk Copy,
|
||||
create a disk, and mount it. The bulk of
|
||||
the work is done by <code>talker</code> and the Python interface package we
|
||||
just created.</p>
|
||||
|
||||
The exception handling does need a few comments, though. Since
|
||||
AppleScript is basically a connectionless RPC protocol nothing happens
|
||||
when we create to talker object. Hence, if the destination application
|
||||
is not running we will not notice until we send our first
|
||||
command. There is another thing to note about errors returned by
|
||||
AppleScript calls: <CODE>MacOS.Error</CODE> is raised for
|
||||
all of the errors that are known to be <CODE>OSErr</CODE>-type errors,
|
||||
server generated errors raise <CODE>aetools.Error</CODE>. <p>
|
||||
<p>
|
||||
The exception handling does warrant a few comments, though. Since
|
||||
AppleScript is basically a connectionless RPC protocol,
|
||||
nothing happens
|
||||
when we create the <code>talker</code> object. Hence, if the destination application
|
||||
is not running, we will not notice until we send our first
|
||||
command (avoid this as described above). There is another thing to note about errors returned by
|
||||
AppleScript calls: <code>MacOS.Error</code> is raised for
|
||||
all of the errors that are known to be <code>OSErr</code>-type errors,
|
||||
while
|
||||
server generated errors raise <code>aetools.Error</code>. </p>
|
||||
|
||||
<H2>Scripting Additions</H2>
|
||||
<h2>Scripting Additions</h2>
|
||||
|
||||
<p>
|
||||
If you want to use any of the scripting additions (or OSAXen, in
|
||||
everyday speech) from a Python program you can use the same method
|
||||
as for applications, i.e. run <CODE>gensuitemodule</CODE> on the
|
||||
OSAX (commonly found in <CODE>System Folder:Extensions:Scripting Additions</CODE>
|
||||
everyday speech) from a Python program, you can use the same method
|
||||
as for applications, i.e. run <code>gensuitemodule</code> on the
|
||||
OSAX (commonly found in <code>System Folder:Scripting Additions</code>
|
||||
or something similar). There is one minor gotcha: the application
|
||||
signature to use is <CODE>'MACS'</CODE>. <P>
|
||||
signature to use is <code>MACS</code>. You will need to edit the main class
|
||||
in the <code>__init__.py</code> file of the created package and change the value
|
||||
of <code>_signature</code> to <code>MACS</code>.
|
||||
</p>
|
||||
|
||||
There are two minor points to watch out for when using gensuitemodule
|
||||
on OSAXen: they appear all to define the class <CODE>System_Object_Suite</CODE>,
|
||||
<p>
|
||||
There are two minor points to watch out for when using <code>gensuitemodule</code>
|
||||
on OSAXen: they appear all to define the class <code>System_Object_Suite</code>,
|
||||
and a lot of them have the command set in multiple dialects. You have to
|
||||
watch out for name conflicts, so, and make sure you select a reasonable dialect
|
||||
(some of the non-english dialects cause gensuitemodule to generate incorrect
|
||||
Python code). <P>
|
||||
watch out for name conflicts and make sure you select a reasonable dialect
|
||||
(some of the non-English dialects cause <code>gensuitemodule</code> to generate incorrect
|
||||
Python code). </p>
|
||||
|
||||
<H2>Further Reading</H2>
|
||||
Despite these difficulties, OSAXen offer a lot of possibilities. Take a
|
||||
look at some of the OSAXen in the Scripting Additions folder, or
|
||||
<A HREF="http://www.osaxen.com/index.php">download</A> some from the net.
|
||||
|
||||
If you want to look at more involved examples of applescripting look at the standard
|
||||
<h2>Further Reading</h2>
|
||||
|
||||
<p>
|
||||
If you want to look at more involved examples of applescripting, look at the standard
|
||||
modules <code>findertools</code> and <code>nsremote</code>, or (possibly better, as it
|
||||
is more involved) <code>fullbuild</code> from the Mac:scripts folder.
|
||||
is more involved) <code>fullbuild</code> from the <code>Mac:scripts</code> folder.
|
||||
</p>
|
||||
|
||||
<h2><a name="alternatives">Alternatives</a></h2>
|
||||
|
||||
<h3><a name="osx">Mac OS X</a></h3>
|
||||
|
||||
<p>
|
||||
Under Mac OS X, the above still works, but with some new difficulties.
|
||||
The application package structure can hide the ‘AETE’ or ‘AEUT’ resource
|
||||
from <code>gensuitemodule</code>, so that, for example, it cannot generate an OSA interface to
|
||||
iTunes.
|
||||
</p>
|
||||
|
||||
<p>
|
||||
One alternative is available through the Unix command line version of python.
|
||||
Apple has provided the <code>osacompile</code> and <code>osascript</code> tools,
|
||||
which can be used to compile and execute scripts written in OSA languages. See the
|
||||
man pages for more details.
|
||||
</p>
|
||||
|
||||
|
||||
</body>
|
||||
</html>
|
||||
Loading…
Reference in New Issue