CheckConnect method determines whether a pin connection is suitable.
virtual HRESULT CheckConnect( PIN_DIRECTION dir, IPin *pPin );
Member of the PIN_DIRECTION enumerated type, specifying which pin on the filter is making the connection.
Pointer to the IPin interface of the other pin in this connection attempt.
The CTransformInputPin::CheckConnect and CTransformOutputPin::CheckConnect methods call this method during the pin connection process. This method does nothing in the base class. The derived class can override it. For example, the derived class might query the other pin for a particular interface.