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I'm going to make simple program that dll importing/exporting

I have complete to compile the dll part and I gained a dll file and a lib file sucessfully.

but when I'm going to make the client...

Well, I missed it.
but,
I'm sorry that It is not my question point.

My Question is how any classes cast into specific interface class
in order to extending facilities to a class by...

I updated the thread I've posted.
please read again my posting where source and error message.

thanx for your attention.

I want to use a class composed of all pure virtual functions as like 'interface' in java. but instantiating a new derived class as interface class is not allowed.

like following code:

class...