Re: problems marshaling arbitrary sized arrays of structs

"Igor Tandetnik" <>
Wed, 3 Jan 2007 09:09:58 -0500
"kombat" <> wrote in message

The interface is a dual interface

That's what I thought. Your method is not automation compatible, you
can't put it into a dual interface. I bet MIDL compiler told you as
much - look at warnings carefully when you compile your IDL.

Break this method out into a separate custom interface (one derived from
IUnknown), implement this interface alongside your dual interface. Make
sure to define this custom interface outside the library block. Make
sure to build and register proxy/stub DLL (the wizard makes it a
separate project within a solution - make sure to actually build it).

If you want to remain automation compatible, define the method to return
a safearray of structures instead (and change length field to be long
rather than DWORD - many automation clients have difficulty with
unsigned integer types). See

With best wishes,
    Igor Tandetnik

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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
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