The MCIWNDM_NOTIFYMODE message notifies the parent window of an application that the operating mode of the MCI device has changed.
MCIWNDM_NOTIFYMODE
wParam = (WPARAM) (HWND) hwnd;
lParam = (LPARAM) (LONG) mode;
You can enable notification of mode changes of an MCI device by specifying the MCIWNDF_NOTIFYMODE window style.
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