PythonCOM - How to get (LPDISPATCH) of myself?

[Markus Wankus]

Getting clooooseeerr......

OK, apparently what I want is:

win32com.server.util.wrap(self)

This seems to work fine.  All I have left to do is to get my callbacks 
to work.  They are intermittent, but I think it is not Python's fault...

Markus.

Markus Wankus wrote:
> In the spirit of trial and error.. ;o) ..I tried the following to get a 
> Dispatch object to myself from within my Python COM server:
> 
> pythoncom.UnwrapObject(pythoncom.GetActiveObject(self._reg_progid_))
> 
> But got the following exception:
> 
> Traceback (most recent call last):
>   File "C:\PYTHON23\lib\site-packages\win32com\universal.py", line 173, 
> in dispatch
>     retVal = ob._InvokeEx_(meth.dispid, 0, meth.invkind, args, None, None)
>   File "C:\PYTHON23\lib\site-packages\win32com\server\policy.py", line 
> 322, in _InvokeEx_
>     return self._invokeex_(dispid, lcid, wFlags, args, kwargs, 
> serviceProvider)
>   File "C:\PYTHON23\lib\site-packages\win32com\server\policy.py", line 
> 541, in _invokeex_
>     return func(*args)
>   File "E:\_DEV\python\solidworks\PropertyPageUtils.py", line 53, in 
> ConnectToSW
>     obj = 
> pythoncom.UnwrapObject(pythoncom.GetActiveObject(self._reg_progid_))
> pywintypes.com_error: (-2147221021, 'Operation unavailable', None, None)
> 
> Can anyone tell me what 'Operation unavailable' might be hinting at?
> 
> Markus.
> 
> Markus Wankus wrote:
> 
>> I have a Python COM server which supports callbacks for a large CAD 
>> program.  It adds menu items and then listens to events - however, I 
>> have a problem (obviously)...  I'm a COM idiot - so please expect dumb 
>> questions.
>>
>> There are a bunch of functions that require a pointer to the event 
>> handler, or a pointer to my COM server.  Prolem is - it is looking for 
>> a pointer to a Dispatch object - but I have already been dispatched. 
>> Maybe an example will clear things up.  One of the functions is as 
>> follows:
>>
>> Status = SldWorks.SetAddinCallbackInfo ( ModuleHandle, AddinCallbacks, 
>> Cookie )
>>
>> Input:
>>  (long) ModuleHandle
>>  Instance handle of the add-in
>>
>> Input:
>>  (LPDISPATCH) AddinCallbacks
>>  Pointer to the object that includes the add-in callback methods
>>
>> Input:
>>  (long) Cookie
>>  Add-in ID; this is the same Cookie you specified in SwAddin::ConnectToSW
>>
>> Output:
>>  (VARIANT_BOOL) Status
>>  TRUE if successful, FALSE if unsuccessful
>>
>> What I *want* to do is essentially:
>>
>> SetAddinCallbackInfo(id(self), self, self.ICookie)
>>
>> ...however - this fails because "self" (my COM server) is not a 
>> Pointer to a Dispatch object.
>>
>> I can get it to work if I do the following:
>>
>> SetAddinCallbackInfo(id(self), Dispatch(self._reg_progid_), self.ICookie)
>>
>> ...however this dipatches a new instance of my COM server, losing any 
>> attributes that may have been set since instantiation - thus is useless.
>>
>> Is there a way to get a pointer to a Dispatch object of yourself?
>>
>> Thanks,
>> Mark.