Any help here would be appreciated. But I hope I don't kill my odds by
having redacting the names of all the (proprietary) libraries involved.
(Or by the fact that I'm new to COM.)
Anyhow, as part of a collaboration, I'm building a win32 application
that uses COM to interact with several proprietary libs, and I do not
have access to the sources. I have VBA code (that works) that I am
trying to port to python.
VBA:
------------------------
Dim pA as TypelibA.InterfaceA
Dim pB as TypelibB.InterfaceB
Dim othermodule as OtherModule
'After this line, pA points to a new "thingA"
Set othermodule as New OtherModule
othermodule.generator "thingA", pA
'Cast
Set pB = pA
msgbox pB.Count()
------------------------
The above code works just fine. The cast ("Set pB = pA") is what seems
to be giving me problems when converting to Python:
Python:
------------------------
pA = othermodule.generator("thingA")
print pA
#output: <win32com.gen_py.TypelibA.InterfaceA instance at 0x13123176>
#Now, the "cast"
mod = gencache.GetModuleForTypelib(typelibB_CLSID,0x0,1,0)
pB = mod.InterfaceB(pA)
#Check cast
print pB
#output: <win32com.gen_py.TypelibeB.InterfaceB instance at
0x13161656> #Looks good?
#Test
print pB.Count()
#Output: pywintypes.com_error: (-2147319765, 'Element not found.',
None, None)
I have also tried different methods for casting. Most of the others
(say, by using the IID directly) give me __repr__'s with nonsensical
mixtures, such as "TypelibA.interfaceB", even though interfaceB is only
defined in TypelibB. "CastTo" fails because "The interface does not
appear in the same library as the object."
All casting approaches result in the same "Element not found" error.
All I know about InterfaceB is that it is probably a Collection or
derived from a Collection. I've read somewhere about issues with
"dependent typelibs." Is this what I'm coming up against? Any ideas?
Many thanks,
-Ben
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