Removes one or more required category identifiers from a class.
HRESULT UnRegisterClassReqCategories(
REFCLSID rclsid, //Class ID of the relevent class
ULONG cCategories, //Number of category CATIDs
CATID* rgcatid* //Array of cCategories CATID
);
In case of an error, this function does not ensure that the Registry is restored to the state prior to the call. The call will be successful even if one or more of the category IDs specified are not registered for the class.
Windows NT: Use version 5.0 or later.
Windows: Unsupported.
Windows CE: Unsupported.
Header: Declared in comcat.h.
ICatRegister::RegisterCategories, ICatRegister::RegisterClassImplCategories, ICatRegister::UnRegisterCategories, ICatRegister::UnRegisterClassImplCategories, ICatRegister::RegisterClassReqCategories