WM_CAP_SET_CALLBACK_FRAME
The
WM_CAP_SET_CALLBACK_FRAME message sets a preview callback function in the
application. AVICap calls this procedure when the capture window captures
preview frames. You can send this message explicitly or by using the capSetCallbackOnFrame macro.
WM_CAP_SET_CALLBACK_FRAME
wParam = (WPARAM) 0;
lParam = (LPARAM) (LPVOID) (fpProc);
Parameters
fpProc
Address of
the preview callback function. Specify NULL for this parameter to disable a previously
installed callback function.
Return Values
Returns TRUE
if successful or FALSE if streaming capture or a single-frame capture session
is in progress.
Remarks
The capture
window calls the callback function before displaying preview frames. This
allows an application to modify the frame if desired. This callback function is
not used during streaming video capture.
See Also