The MCIWNDM_RETURNSTRING message retrieves the reply to the most recent MCI string command sent to an MCI device. Information in the reply is supplied as a null-terminated string. You can send this message explicitly or by using the MCIWndReturnString macro.
MCIWNDM_RETURNSTRING
wParam = (WPARAM) (UINT) len;
lParam = (LPARAM) (LPVOID) lp;
Returns an integer corresponding to the MCI string.
If the null-terminated string is longer than the buffer, the string is truncated.
Windows NT: Requires version 3.1 or later.
Windows: Requires Windows 95 or later.
Windows CE: Unsupported.
Header: Declared in vfw.h.
Unicode: Defined as Unicode and ANSI messages.
MCIWnd Window Class Overview, MCIWnd Messages, MCIWndReturnString