Home > DeveloperSection > Interviews > Can you explain IUnknown interface used in COM ?

Posted on    March-28-2011 8:57 AM

 Visual C++ Visual C++ 
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Amit Singh

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Posted on    March-28-2011 12:00 AM

COM is an acronym for Component Object Model. COM is a way of building objects that is independent of any programming language. 
Every COM object implements an interface named IUnknown. It contains three methods:
-         QueryInterface: Returns a pointer to another interface
-         AddRef:  Increments the objects reference count
-         Release: Decrements the objects reference count.

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