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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
capSetCallbackOnFrame
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