The WM_CAP_EDIT_COPY message copies the contents of the video frame buffer and associated palette to the clipboard. You can send this message explicitly or by using the capEditCopy macro.
WM_CAP_EDIT_COPY 
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, capEditCopy