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Retrieves the pin with the specified identifier.
HRESULT FindPin( LPCWSTR Id , IPin ** ppPin );
Parameters
- Id
- Identifier of the pin.
- ppPin
- Pointer to the
IPininterface for this pin
after the filter has been restored.
Return Values
The default implementation by this member function returns S_OK if the pin name was found or VFW_E_NOT_FOUNDotherwise.
Remarks
This member function provides a base class definition of the IBaseFilter::FindPinmethod that, along with the IPin::QueryIdmethod, is used to implement persistent filter graphs. A filter must be able to translate the IPininterface pointers to its pins into identifiers that can be saved along with the configuration of the filter graph. It does this by using the IPin::QueryIdmethod. It must then be able to convert those identifiers back into IPininterface pointers when the filter and its connections are restored as part of a persistent filter graph. This is accomplished using the IBaseFilter::FindPinmethod.
By default, the base classes use the pin name in the m_pNamedata member, so implementing this member function in your derived filter class is not normally required.
The ppPinparameter is set to NULL if the identifier cannot be matched.