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What is the difference between Hub and Switch?
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Answer Posted / sheikh sikkandar,singapore
In programming, the IUnknown interface is the fundamental
interface in the Component Object Model (COM). The
published COM specification mandates that COM objects must
minimally implement this interface. Furthermore, every
other COM interface must be derived from IUnknown.
The IUnknown interface exposes three methods (sometimes
called functions): QueryInterface, AddRef, and Release:[1]
QueryInterface is used to obtain a pointer to another
interface, given a GUID that uniquely identifies that
interface (commonly known as an interface ID, or IID). If
the COM object does not implement that interface, an
E_NOINTERFACE error is returned instead.
AddRef is used by clients to indicate that a COM object is
being referenced. This is necessary to ensure that a COM
object is not disposed prematurely.
Release is used by clients to indicate that they have
finished using the COM object. An unreferenced COM object
may be safely disposed.
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