[python-win32] Casting to interface from different typelib?

[Ben Gordon]

Mark,

MH> pB = mod.InterfaceB(pA.QueryInterface(IID_B, pythoncom.IID_IDispatch))

Thanks so much for the suggestion.  I tried it, but it appears that pA 
does not provide a QueryInterface method.

     <output>
     File "c:\Python25\lib\site-packages\win32com\client\__init__.py", 
line 454, in __getattr__
        raise AttributeError, "'%s' object has no attribute '%s'" % 
(repr(self), attr)
     AttributeError: '<win32com.gen_py.TypelibA.InterfaceA instance at 
0x13106712>' object has no attribute 'QueryInterface'
     </output>

Does this mean I'm out of luck?

MH> It might also be worth seeing if we can fix that somehow - eg, maybe 
an optional param allowing the interface and the object itself to be in 
those different typelibs.

I'm not sure what magic is involved behind the scenes, but this type of 
cast seems to be comparatively convenient and nearly transparent in 
VBA/VB (VB requires an explicit CType call), without the need to lookup 
CLSIDs/IIDs. 

Thanks again,

    -Ben