The capCaptureSingleFrameOpen macro opens the capture file for single-frame capturing. Any previous information in the capture file is overwritten. You can use this macro or explicitly send the WM_CAP_SINGLE_FRAME_OPEN message.
BOOL capCaptureSingleFrameOpen(
  hwnd  
);
 Returns TRUE if successful or FALSE otherwise.
For information about installing callback functions, see the capSetCallbackOnError and capSetCallbackOnFrame macros.
  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 Macros, capSetCallbackOnError, capSetCallbackOnFrame, WM_CAP_SINGLE_FRAME_OPEN