There are some tools that can recover typelib data from binaries such as unmidle (http://www.immunitysec.com/downloads/unmidl_1_2.tgz) or muddle (don't have a link handy).
mike -----Original Message----- From: Jason R. Coombs [mailto:jar...@jaraco.com] Sent: Wednesday, May 27, 2009 4:12 AM To: comtypes-users@lists.sourceforge.net Subject: Re: [comtypes-users] How to generate Interface when no typelib or idl? Thanks very much. I struggled with this for a long time, but my lack of experience with COM left me searching for the wrong things. For the sake of completeness, I went ahead and tried compiling the .idl you supplied. Sure enough, just compiling it with midl produced a .tlb that I could then call with comtypes GetModule... though I'll be using the first approach and using the typelib already generated by another. Thanks for the thorough answer, and for ctypes. Jason > -----Original Message----- > From: Thomas Heller [mailto:thel...@ctypes.org] > Sent: Wednesday, 27 May, 2009 04:00 > To: comtypes-users@lists.sourceforge.net > Subject: Re: [comtypes-users] How to generate Interface when no typelib > or idl? > > Jason R. Coombs schrieb: > > 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? > > Often, this has already been done. A little googling found this page > which has a DirectShow.tlb type library: > > http://www.kohsuke.org/dotnet/directshowTypelib/ > > And it seems to work: > > Python 2.5.4 (r254:67916, Dec 23 2008, 15:10:54) [MSC v.1310 32 bit > (Intel)] on win32 > Type "help", "copyright", "credits" or "license" for more information. > >>> from comtypes.client import GetModule > >>> GetModule("DirectShow.tlb") > # Generating comtypes.gen._24BC6711_3881_420F_8299_34DA1026D31E_0_1_0 > # Generating comtypes.gen._00020430_0000_0000_C000_000000000046_0_2_0 > # Generating comtypes.gen.stdole > # Generating comtypes.gen.DirectShowLib > <module 'comtypes.gen.DirectShowLib' from > 'comtypes\gen\_24BC6711_3881_420F_8299_34DA1026D31E_0_1_0.py'> > >>> from comtypes.client import CreateObject > >>> from comtypes.gen import DirectShowLib > >>> builder = CreateObject(DirectShowLib.CaptureGraphBuilder2) > >>> print builder > <POINTER(ICaptureGraphBuilder2) ptr=0x927294 at a939e0> > >>> builder.SetFilterGraph > <bound method POINTER(ICaptureGraphBuilder2).SetFiltergraph of > <POINTER(ICaptureGraphBuilder2) ptr=0x927294 at a939e0>> > >>> help(builder.SetFilterGraph) > Help on method SetFiltergraph in module ctypes: > > SetFiltergraph(...) method of comtypes.POINTER(ICaptureGraphBuilder2) > instance > > >>> > > > If you really want to compile your own type library, here's a simple > idl file > that should get you started. I constructed this by little > experimentation: > > """ > import "oaidl.idl"; > import "ocidl.idl"; > > import "axcore.idl"; > interface ICreateDevEnum; > import "axextend.idl"; > > [ > // TODO: Use a real clsid and helpstring > uuid(00000000-0000-0000-0000-000000000000), > version(1.0), > helpstring("Type Library") > ] > library MyTypeLib > { > interface ICaptureGraphBuilder2; > // TODO: Add more interfaces from axextend.idl that we need > } > """ > > Thomas > > > ----------------------------------------------------------------------- > ------- > Register Now for Creativity and Technology (CaT), June 3rd, NYC. CaT > is a gathering of tech-side developers & brand creativity > professionals. Meet > the minds behind Google Creative Lab, Visual Complexity, Processing, & > iPhoneDevCamp as they present alongside digital heavyweights like > Barbarian > Group, R/GA, & Big Spaceship. http://p.sf.net/sfu/creativitycat-com > _______________________________________________ > comtypes-users mailing list > comtypes-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/comtypes-users ---------------------------------------------------------------------------- -- Register Now for Creativity and Technology (CaT), June 3rd, NYC. CaT is a gathering of tech-side developers & brand creativity professionals. Meet the minds behind Google Creative Lab, Visual Complexity, Processing, & iPhoneDevCamp as they present alongside digital heavyweights like Barbarian Group, R/GA, & Big Spaceship. http://p.sf.net/sfu/creativitycat-com _______________________________________________ comtypes-users mailing list comtypes-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/comtypes-users
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