|Microsoft DirectX 9.0|
The SetMessageDrain method specifies a window to receive mouse and keyboard messages from the video window.
HRESULT SetMessageDrain( HWND hwnd );
[in] Specifies a handle to the message-drain window.
Returns an HRESULT value.
This method is equivalent to the IVideoWindow::put_MessageDrain method.
The Full Screen video renderer posts all mouse and keyboard messages to the window designated as a message drain. The exact list of messages that are posted is the same as the list given in put_MessageDrain.
Applications do not need to use this method. Instead, call the Filter Graph Manager's put_MessageDrain method before switching to full-screen mode. The Filter Graph Manager automatically sets the same message drain on the renderer that it selects for full-screen mode.