Where can I find appropriate documentation on the subset of IDL (Interface Definition Language) functionality I can use when writing COM objects I want to be callable from Visual Basic.
I'm writing a few C++ utility functions in COM objects to be used by Visual Basic. I'm sure there must be some documentation on what's valid and what's not, but I'm having a hard time finding it! ;->
Typical error --
"Function or interface marked as restricted, or the function uses an Automation type not supported in Visual Basic"