[python-win32] Dispatches With Events on COM Object

[Neil Benn]

Hello,

          I am trying to use PythonCOM to interact with a provided 
proprietary COM object.  The Object consists of three dispatch interfaces:

IApplication
IApplicationEvents
IDocumentEvents

    This can be accessed using the CoBaseClass by ProgID 
'OpalControl.Applcation' - so far so good.  The first thing I do is to 
run the following code:

import win32com.client
import time

objCybio = win32com.client.Dispatch('OpalControl.Application', CybioEvents)
objCybio.ConfigFile = r"C:\CyBio Software\Config\opalctrl.ini"
objCybio.Config = "CyBi-Well"
objCybio.visible = True
objCybio.OpenDocument(r'C:\testscript.igl', True)
time.sleep(2)
objCybio.CloseDocument(r'C:\testscript.igl', True)
objCybio = None

    This works fine and it does what I expect, so the next thing to do 
is to try and write something to get the events:

import win32com.client
import time
import win32com.client.gencache

class CybioEvents(object):   
    def __init__(self):
        super(CybioEvents, self).__init__()

    def onCommand(pstrTitle, pstrParam):
        print 'OnCommand\n', pstrTitle,'\n', pstrParam

objCybio = win32com.client.DispatchWithEvents('OpalControl.Application', 
CybioEvents)
objCybio.ConfigFile = r"C:\CyBio Software\Config\opalctrl.ini"
objCybio.Config = "CyBi-Well"
objCybio.visible = True
objCybio.OpenDocument(r'C:\testscript.igl', True)
time.sleep(2)
objCybio.CloseDocument(r'C:\testscript.igl', True)
objCybio = None

  When I run this, I get the following error:

Traceback (most recent call last):
  File "C:\Program 
Files\Python24\Lib\site-packages\pythonwin\pywin\framework\scriptutils.py", 
line 310, in RunScript
    exec codeObject in __main__.__dict__
  File "C:\Documents and Settings\benn\Desktop\cybio test.py", line 9, in ?
    objCybio = 
win32com.client.DispatchWithEvents("OpalControl.Application", CybioEvents)
  File "C:\Program 
Files\Python24\Lib\site-packages\win32com\client\__init__.py", line 254, 
in DispatchWithEvents
    raise TypeError, "This COM object can not automate the makepy 
process - please run makepy manually for this object"
TypeError: This COM object can not automate the makepy process - please 
run makepy manually for this object

    So no probs, using the makepy utility in PythonWin (I'll automate 
this later ;-) )  I generate the required stubs and a file does appear 
which seems to be OK (contains the correct GUIDs and interfaces and so 
on).    Running this again, I get :

Traceback (most recent call last):
  File "C:\Program 
Files\Python24\Lib\site-packages\pythonwin\pywin\framework\scriptutils.py", 
line 310, in RunScript
    exec codeObject in __main__.__dict__
  File "C:\Documents and Settings\benn\Desktop\cybio test.py", line 9, in ?
    objCybio = 
win32com.client.DispatchWithEvents("OpalControl.Application", CybioEvents)
  File "C:\Program 
Files\Python24\Lib\site-packages\win32com\client\__init__.py", line 254, 
in DispatchWithEvents
    raise TypeError, "This COM object can not automate the makepy 
process - please run makepy manually for this object"
TypeError: This COM object can not automate the makepy process - please 
run makepy manually for this object

    Basically the same as above, I've checked this COM object out with 
VB and it works fine - no probs.  In addition looking at the stub file 
in the cache in gen_py, the class has not been compiled to a pyc file 
(I'm assuming that it should be here) so it seems like it is not even 
finding this - although that is a guess.

  I've also tried using the GUID to get hold of the CoBaseClass using 
the GUID but I get the same error, unfortunately I cannot give you the 
COM object as it is dongle protected and therefore will not run.  I can 
attach the generated file from makepy but I won't do that as yet because 
it is relatively big.

  Can anyone shed any light as to how I can track down this problem?

  Thanks in advance for your help.

Cheers,

Neil

-- 
Neil Benn MSc
Head of Automation
Cenix BioScience GmbH
Tatzberg 47
01307 Dresden
Germany

http://wwww.cenix-bioscience.com