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capSetCallbackOnFrame
The capSetCallbackOnFrame macro sets a preview callback function in the application. AVICap calls this
procedure when the capture window captures preview frames. You can use this
macro or explicitly call the WM_CAP_SET_CALLBACK_FRAME message.
BOOL capSetCallbackOnFrame(
Parameters
hwnd
Handle of a capture window.
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
WM_CAP_SET_CALLBACK_FRAME
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