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Increments the reference count for the calling interface on an object. It should be called for every new copy of a pointer to an interface on a given object.
ULONG AddRef(void);
Return Values
Returns an integer from 1 to n, the value of the new reference count. This information is meant to be used for diagnostic/testing purposes only, because, in certain situations, the value might be unstable.
Remarks
This member function implements the IUnknown::AddRefmethod.