Re: Interface inheritance between different COM modules?

"Igor Tandetnik" <>
Fri, 22 Jun 2007 07:49:23 -0400
"Axel Bock" <> wrote in message

I have a - hopefully - simple problem. I need to write an Interface
INT_B in a COM component COM_B, which actually inherits from an
interface INT_A from COM component COM_A.

I try to do this by importlib'ing the COM_A.dll file in the COM_B.idl,
and write the following line:

interface IINT_B : IINT_A { };

Where IINT_A is defined in the COM_A.dll file. Alas I get a MIDL
compiler error: COM_B.idl(31) : warning MIDL2271 : [object] interfaces
must derive from another [object] interface such as IUnknown :
[ Interface 'IINT_A' (IINT_A' ) ].

You need to both import A.idl outside the library block, and importlib
A.tlb (or A.dll) inside the library block.
With best wishes,
    Igor Tandetnik

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