C++ COM ActiveX Interview Question:

What is IUnknown interface?

Submitted by: Administrator

The IUnknown interface lets clients get pointers to other interfaces on a given object through the QueryInterface method, and manage the existence of the object through the IUnknown::AddRef and IUnknown::Release methods.

IUnknown methods can be used to switch between interfaces on an object, add references, and release objects.
You must implement IUnknown as part of every interface.
Submitted by: Administrator