wParam = 0;
lParam = 0;
Notifies a rendering driver to draw the frames that have been passed to it.
Use this message with hardware that performs its own asynchronous decompression, timing, and drawing.
This message is typically used to perform a seek operation when the driver must be specifically instructed to display each video frame passed to it rather than playing a sequence of video frames.
ICM_DRAW, ICM_DRAW_END, ICM_DRAW_START