Hi List,
Hopefully I have my terminology right, I'm pretty new to COM and C++.
My problem is that I have a COM DLL written in C++, that I would like
to call from Python. This DLL implements 3 important interfaces, each
of which is also an IDispatch implementation, like the following:
IDispatchImpl<Interface_1, &__uuidof(Interface_1), &LIBID_Interface_1, 1, 0>
IDispatchImpl<Interface_2, &__uuidof(Interface_2), &LIBID_Interface_2, 1, 0>
IDispatchImpl<Interface_3, &__uuidof(Interface_3), &LIBID_Interface_3 1, 0>
However, when I do:
>>> obj = win32com.client.Dispatch("a.b.c")
>>> obj
<COMObject a.b.c>
The object I get only has methods available for the first of the
interfaces. From my reading, this is simply the functionality of
IDispatch, and if I wanted to get those additional methods through
IDispatch, I would have to update the DLL, and restructure my
interfaces. I'm not confident enough in my C++ to do this, or at least
it's not my first choice.
>From what I've read, there are two ways that seem to be possibilities
for being able to call the methods from the other interfaces.
The simplest one I found was the suggestion to use MakePy on the type
library containing Interface_2 and Interface_3. I did this, and copied
the generated file to my working directory, then did:
>>> from interfaces import Interface_2
>>> obj_i2 = Interface_2(obj)
>>> obj_i2
<win32com.gen_py.typelibname 1.0 Type Library.Interface_2 instance at
0x17459602>
Unfortunately when I try:
>>> obj_i2.secondaryMethod()
Traceback (most recent call last):
...
File "C:\Python25\lib\site-packages\win32com\client\__init__.py",
line 449, in _ApplyTypes_
dispid, 0, wFlags, retType, argTypes, *args),
com_error: (-2147319779, 'Library not registered.', None, None)
The other suggestion I came across was to use QueryInterface. I wasn't
sure what argument to pass to QueryInterface, so I tried using the
CLSID of the interface I wanted.
>>> obj._oleobj_.QueryInterface(Interface_2.CLSID)
Traceback (most recent call last):
File "<interactive input>", line 1, in <module>
TypeError: There is no interface object registered that supports this IID
>From these error messages, it seems like perhaps there's a problem
with the registration of the type library that contains the
interfaces. I'm not really sure how to fix that, or if that is even
the problem.
Any ideas?
Thanks,
Alec Munro
_______________________________________________
python-win32 mailing list
python-win32@python.org
http://mail.python.org/mailman/listinfo/python-win32
