Re: CComVariant

"Igor Tandetnik" <>
Mon, 7 Apr 2008 00:09:24 -0400
"George" <> wrote in message

What should IC's vtable look like, in your opinion? List all methods
in the order they should appear. Note that the following should work:

In MSVC, IC has "two" vtables. They are,

vtable1 for IA

QueryInterface (from IA::IUnknown)
AddRef (from IA::IUnknown)
Release (from IA::IUnknown)

I don't understand. Where's MethodA

vtable 2 for IB

QueryInterface (from IB::IUnknown)
AddRef (from IB::IUnknown)
Release (from IB::IUnknown)

Where's MethodB?

And finally, where does MethodC go?

when we convert IC instance to IA, vtable 1 will be used, and when we
convert IC instance to IB, vtable2 will be used.

And if I don't convert, but use pC directly? What does it point to? I
should have access to 6 methods from it (QueryInterface, AddRef,
Release, MethodA, MethodB and MethodC).
With best wishes,
    Igor Tandetnik

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