The MCIWNDM_GETSTART message retrieves the location of the beginning of the content of an MCI device or file. You can send this message explicitly or by using the MCIWndGetStart macro.
MCIWNDM_GETSTART
wParam = 0;
lParam = 0;
Typically, the return value is zero; but some devices use a nonzero starting location. Seeking to this location sets the device to the start of the media.
Returns the location in the current time format.
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, MCIWndGetStart