|Microsoft DirectX 9.0|
The get_MessageDrain method retrieves the window that receives mouse and keyboard messages from the video window, if any.
HRESULT get_MessageDrain( OAHWND *Drain );
[in] Pointer to a variable that receives a handle to the window, as an OAHWND type. If no message drain was set, this parameter receives the value NULL.
Possible return values include the following:
|VFW_E_NOT_CONNECTED||The video renderer filter is not connected.|