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(
|
hwnd, |
|
|
fpProc |
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|
); |
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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