interview

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

Ask Question
Amit Singh

Amit Singh

Follow

Can you answer this question?

Answer

1 Answers

Amit Singh

Amit Singh

28-Mar-2011
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.

Liked By