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Called by the CBaseFilterimplementation when the state changes from stopped to paused or running.


virtual HRESULT Active(void);



Return Value

Returns an HRESULTvalue.

The default implementation returns NOERROR.


Any class that requires notification of a change of state should override this member function. This is called when the filter owning the pin exits the State_Stopped state.

The filter graph manager's internal state variable is not updated until after this member function returns, so avoid testing the filter graph manager's state (directly or indirectly) from within this member function.


Windows Embedded CE Windows CE 2.12 and later
Windows Mobile Windows Mobile Version 5.0 and later
Note Microsoft DirectShow applications and DirectShow filters have different include file and Library requirements
For more information, see Setting Up the Build Environment,
Version 2.12 requires DXPAK 1.0 or later