The MCIWNDM_SETINACTIVETIMER message sets the update period used by MCIWnd to update the trackbar in the MCIWnd window, update position information displayed in the window title bar, and send notification messages to the parent window when the MCIWnd window is inactive. You can send this message explicitly or by using the MCIWndSetInactiveTimer macro.
MCIWNDM_SETINACTIVETIMER
wParam = (WPARAM) (UINT) inactive;
lParam = 0;
This message does not return a value.
Windows NT: Requires version 3.1 or later.
Windows: Requires Windows 95 or later.
Windows CE: Unsupported.
Header: Declared in vfw.h.
MCIWnd Window Class Overview, MCIWnd Messages, MCIWndSetInactiveTimer