The MCIWndSetVolume macro sets the volume level of an MCI device. You can use this macro or explicitly send the MCIWNDM_SETVOLUME message.
LONG MCIWndSetVolume(
hwnd,
iVol
);
Returns zero if successful or an error otherwise.
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 Macros, MCIWNDM_SETVOLUME