I'm trying to port VideoCapture from an extension module to a pure-python module based on comtypes.
I've started by converting the following:
hr = CoCreateInstance(CLSID_CaptureGraphBuilder2, NULL, CLSCTX_INPROC,
IID_ICaptureGraphBuilder2, (void
**)&self->ob_pBuilder);
hr = self->ob_pBuilder->SetFiltergraph(self->ob_pGraph);
to the following using comtypes:
self.graph_builder =
CreateObject(CLSID_CaptureGraphBuilder2, CLSCTX_INPROC)
self.graph_builder.SetFiltergraph(self.filter_graph)
The problem I encounter is the creation of the graph_builder doesn't have
any type information, so SetFiltergraph fails. It has no interface, so gets
created as an IUnknown.
I can find in the SDK the .idl that contains the definition for
ICaptureGraphBuilder2 (axextend.idl) and other interfaces I'll need. The
docs indicate that the best way to generate the Interface classes is to
create a temporary type lib from the IDL. Can you describe or point me to a
description of how one would go about creating a temporary type lib? Is it
possible that there's already a type lib created for some other purpose
lying around, and if so, how would I locate it?
Thanks and regards,
Jason
smime.p7s
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