How to add morethan one interface for a COM object

Ganesamoorthy.S asked:

Hi,

I have created a COM DLL Server Project and accessed it by creating a clinet having CoCreateInstance().

Then i have modified the COM server project by adding one more interface.

In order to obtain the object for the second interface, i have called the QueryInterface function.

But QueryInterface always returns "E_NOINTERFACE".

What is the mistake i am making, please clarify.

What are the points we need to keep in mind while creating the second interface?

Kindly Advise.

Thanks,
Ganesamoorthy

Tags: ATL, COM, COM+

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