Re: Using same interfaces for in-proc vs. out-proc

"Igor Tandetnik" <>
Thu, 12 Nov 2009 21:57:34 -0500
Drew wrote:

OK. I've included the header generated from the cut down IDL and =


and am able to compile/link. Now I'm trying to test a simple COM =


using VB6 and it appears that -all- coclasses must be included in the =


down version of the IDL because VB does not see any interface other =

than my

Application interface and the Document interface that is exposed =

through the

Application interface. So is my observation correct that all coclasses =


be included in the cut down IDL and that their GUIDs must be unique =


EXE and DLL projects?

This is a bit surprising. I expected VB to follow the link and read =
shared.tlb. It looks like it does, but only extracts the types that are =
referenced by those mentioned in the "main" TLB (likely recursively).

You seem to have interfaces that are not reachable from the root =
application object. I'm curious - how are those supposed to be used from =
VB? Anyway, you can make them visible by forward-declaring them in =
"main" TLB:

library MyLibrary {

  interface IMyOtherInterface;

  coclass MyServer {
    [default] interface IMyApplicationInterface;

This should make IMyOtherInterface, and everything that it references, =
visible in VB.
With best wishes,
    Igor Tandetnik

With sufficient thrust, pigs fly just fine. However, this is not =
necessarily a good idea. It is hard to be sure where they are going to =
land, and it could be dangerous sitting under them as they fly overhead. =
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