[Pythonmac-SIG] How do I send appleevents to an external program

[Joachim Mårtensson]

Hello everyone.
I am trying to figure out how to send appleevents to an external 
program. What I want to accomplish is to open a text document in a 
editor that supports the external editor protocol as described here 
http://www.codingmonkeys.de/techpubs/externaleditor/pbxexternaleditor.html.
Here is my code so far, What am I doing wrong? _filePath is the path to 
the file and _lnnum is the line number where I want to place the caret. 
I am using PyObjc but no api in cocoa seems to exist so I use various 
other modules.

def openInExternalEditor(self, _filePath, _lnnum):
    import aetools, struct
       
    editor = aetools.TalkTo('TxMt', 0) # TxMt = textmate a texteditor
    keyDirectObject = '----'
    keyAEPosition = 'sopk'
    _code = 'aeve'                # kCoreEventClass
    _subcode = 'odoc'          # kAEOpenDocuments
    SelectionRange=struct.pack('hhllll', 0, int(_lnnum), 0,0,0,0)
    _arguments = {}
    _arguments[keyDirectObject] = _filePath
    _arguments[keyAEPosition] = SelectionRange
        
    _attributes = {}
    editor.send(_code, _subcode, _arguments, _attributes)

Thanks in advance
Joachim Mårtensson