Re: CoCreateInstance inside a COM dll?

"Igor Tandetnik" <>
Fri, 24 Aug 2007 15:51:52 -0400
Donos <> wrote:

I changed the COM code like this,

STDMETHOD GetMyInterface(IMyInterface** pMyInterface, VARIANT_BOOL*
HRESULT hr = QueryInterface(__uuidof(IMyInterface));

Aren't you the least bit put off by the fact that you never use
pMyInterface parameter (nor, in fact, pResult parameter)? How is the
result of QueryInterface call supposed to get to the caller? Where is
the result of QueryInterface call stored in the first place?

I strongly recommend you get a COM textbook, read it, and come back here
if you still have questions. What you are currently engaged in is called
shotgun debugging:

You just make code changes at random in hopes of accidentally stumbling
upon the right combination. Besides, you don't seem to actually read, or
at least promptly ignore once read, any answers to your questions. With
all due respect, you are wasting both your time and the time of this
group's participants.

And also the Client code like this,

IMyInterface** pInterface;
HRESULT hr = m_pFirstInterface->GetMyInterface(&pInterface);

I've already told you this is incorrect.
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. -- RFC 1925

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