Using preprocessor directives in an IDL file

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From: joarvat (joarvat_at_discussions.microsoft.com)
Date: 08/20/04 

Date: Fri, 20 Aug 2004 02:11:02 -0700

Hi, I wanted to use preprocessor directives of the form

#ifdef _SOMETHING
        uuid(9980BD04-FDEB-4C53-BF57-E54087048DF0),
        version(3.5),
        helpstring("MS FAST CSDefault 3.5 Type Library")
#else
        uuid(0aa674ef-9ac5-4d69-9ca6-69a666681aac),
        version(1.1),
        helpstring("MS CombiMat CSDefault 1.1 Type Library")
#endif

in the .idl file of a project. According to documentation, you should be
able to define a preprocessor macro for the MIDL preprocessor in the project
settings MIDL tab (preprocessor definitions edit box). However, I can't see
any evidence that this is working. If I define my symbol, it is not
recognized by the preprocessor.

I'm using Visual Studio C++ 6.

Does anyone have a clue to how this should work?

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