The WM_CAP_SINGLE_FRAME message appends a single frame to a capture file that was opened using the WM_CAP_SINGLE_FRAME_OPEN message. You can send this message explicitly or by using the capCaptureSingleFrame macro.
WM_CAP_SINGLE_FRAME
wParam = (WPARAM) 0;
lParam = 0L;
Returns TRUE if successful or FALSE otherwise.
Windows NT: Requires version 3.1 or later.
Windows: Requires Windows 95 or later.
Windows CE: Unsupported.
Header: Declared in vfw.h.
Video Capture Overview, Video Capture Messages, capCaptureSingleFrame, WM_CAP_SINGLE_FRAME_OPEN