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IUnknown Interface

QueryInterface

AddRef

Release

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HRESULT QueryInterface(REFIID iid, void ** ppvObject )

Parameters

iid- [in] Interface id.

ppvObject - [out] returned pointer to the interface. 

Return Values

S_OK in case of success

E_NOINTERFACE - The interface is not implemented by the object.

Remarks

 

The QueryInterface method gives the caller access to other interfaces on an object. See samples and your development system documentation for more details.

 

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ULONG AddRef()

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 may be unstable.

 

Remarks

Increments reference counter for the object. See samples and your development system documentation for more details.

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 ULONG Release()

Returns

Resulting reference count.

Remarks

 Call to decrement reference count for the object. See samples and your development system documentation for more details.