This method frees resources associated with the parameters of an event.

HRESULT FreeEventParams(
  long lEventCode,
  long lParam1,
  long lParam2


  • lEventCode
    [in] Next event notification.
  • lParam1
    [in] First parameter of the event.
  • lParam2
    [in] Second parameter of the event.

Return Values

Returns an HRESULT value.


Event parameters can be of type LONG or BSTR. If a BSTR is passed as an event, it will have been allocated by the task allocator and should be freed using this method. No reference-counted interfaces are passed to an application using IMediaEvent::GetEvent because these cannot be overridden by IMediaEvent::CancelDefaultHandling. Therefore, this method is not used to release interfaces.


DirectShow applications and DirectShow filters have different include file and link library requirements. See Setting Up the Build Environment for more information.

OS Versions: Windows CE 2.12 and later. Version 2.12 requires DXPAK 1.0 or later.

See Also

IMediaEvent Interface

Last updated on Wednesday, April 13, 2005

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