Microsoft Visual C++/VC++, Calling COM DLL from .c files

Calling COM DLL from .c files

Author	Message
avd.. #1 / 4	Calling COM DLL from .c files I have a third party COM DLL written in VB (just application extension). I need to call it from C program (done in VC++ environment). I tried doing this with the common # import, as follows: #import "E:\Program Files\SampleCOM.dll" no_namespace However, this does not work, I get the following error: error C2773: #import only available in C++ compiler (which is logical). However, I have no idea how to call this from C?! I have been searching the MSDN etc. but for the life of me could not find SIMPLE, and straightforward explanation. I would REALLY appreciate any help. Thanks a lot. Sent via Deja.com http://www.--*.com/ Before you buy.
Sun, 16 Mar 2003 03:00:00 GMT

Guillaume Landr #2 / 4	Calling COM DLL from .c files Do you know that you can mix C and CPP files in a project? If you really want to use C, have a look at: CoInitialize(Ex) CoCreateInstance(Ex) GetIDsOfNames (if you don't have any include file) Invoke and you have to call some of them like: pDispatch->lpVtbl->Invoke(...) where pDispatch is a pointer to your object. Cheers, Guillaume. Quote: > I have a third party COM DLL written in VB (just application extension). > I need to call it from C program (done in VC++ environment). I tried > doing this with the common "# import", as follows: > #import "E:\Program Files\SampleCOM.dll" no_namespace > However, this does not work, I get the following error: > error C2773: #import only available in C++ compiler > (which is logical). > However, I have no idea how to call this from C?! > I have been searching the MSDN etc. but for the life of me could not > find SIMPLE, and straightforward explanation. > I would REALLY appreciate any help. > Thanks a lot. > Sent via Deja.com http://www.deja.com/ > Before you buy.
Sun, 16 Mar 2003 03:00:00 GMT

Andy Walldorf #3 / 4	Calling COM DLL from .c files You may also want to build a dummy COM object and take a look at the C helper macros generated by MIDL. Look for COBJMACROS in the generated .h. Quote: > Do you know that you can mix C and CPP files in a project? > If you really want to use C, have a look at: > CoInitialize(Ex) > CoCreateInstance(Ex) > GetIDsOfNames (if you don't have any include file) > Invoke > and you have to call some of them like: pDispatch->lpVtbl->Invoke(...) where > pDispatch is a pointer to your object. > Cheers, > Guillaume. Quote: > > I have a third party COM DLL written in VB (just application extension). > > I need to call it from C program (done in VC++ environment). I tried > > doing this with the common "# import", as follows: > > #import "E:\Program Files\SampleCOM.dll" no_namespace > > However, this does not work, I get the following error: > > error C2773: #import only available in C++ compiler > > (which is logical). > > However, I have no idea how to call this from C?! > > I have been searching the MSDN etc. but for the life of me could not > > find SIMPLE, and straightforward explanation. > > I would REALLY appreciate any help. > > Thanks a lot. > > Sent via Deja.com http://www.deja.com/ > > Before you buy.
Sun, 16 Mar 2003 03:00:00 GMT

Mark Kruege #4 / 4	Calling COM DLL from .c files We're mixing C and CPP files to call some VB COM DLLs from an old C application. So far works great. We put the #import in an HPP file and write routines in a CPP file to access the COM object. The CPP routines are defined as extern "C" so the routine names aren't mangled so the C routines can refer to 'em. The tradeoff is we have to write one of these CPP "wrapper" routines for each access to the COM that the C routines need to make. - Mark Quote: > Do you know that you can mix C and CPP files in a project? > If you really want to use C, have a look at: > CoInitialize(Ex) > CoCreateInstance(Ex) > GetIDsOfNames (if you don't have any include file) > Invoke > and you have to call some of them like: pDispatch->lpVtbl->Invoke(...) where > pDispatch is a pointer to your object. > Cheers, > Guillaume. Quote: > > I have a third party COM DLL written in VB (just application extension). > > I need to call it from C program (done in VC++ environment). I tried > > doing this with the common "# import", as follows: > > #import "E:\Program Files\SampleCOM.dll" no_namespace > > However, this does not work, I get the following error: > > error C2773: #import only available in C++ compiler > > (which is logical). > > However, I have no idea how to call this from C?! > > I have been searching the MSDN etc. but for the life of me could not > > find SIMPLE, and straightforward explanation. > > I would REALLY appreciate any help. > > Thanks a lot. > > Sent via Deja.com http://www.deja.com/ > > Before you buy.
Fri, 11 Apr 2003 03:00:00 GMT

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