capSetCallbackOnYield
The
capSetCallbackOnYield macro sets a callback function in the application. AVICap calls this
procedure when the capture window yields during streaming capture. You can use this
macro or explicitly call the
WM_CAP_SET_CALLBACK_YIELD message.
BOOL capSetCallbackOnYield(
Parameters
hwnd
Handle of a capture window.
fpProc
Address of the yield callback function. Specify NULL for this parameter to
disable a previously installed yield callback function.
Return Values
Returns TRUE if successful or FALSE if streaming capture or a single-frame
capture session is in progress.
Remarks
Applications can optionally set a yield callback function. The yield callback
function is called at least once for each video frame captured during streaming
capture. If a yield callback function is installed, it will be called
regardless of the state of the
fYield member of the
CAPTUREPARMS structure.
If the yield callback function is used, it must be installed before starting
the capture session and it must remain enabled for the duration of the session.
It can be disabled after streaming capture ends.
Applications typically perform some type of message processing in the callback
function consisting of a
PeekMessage,
TranslateMessage,
DispatchMessage loop, as in the message loop of a
WinMain function. The yield callback function must also filter and remove messages
that can cause reentrancy problems.
An application typically returns TRUE in the yield procedure to continue
streaming capture. If a yield callback function returns FALSE, the capture window
stops the capture process.
See Also
CAPTUREPARMS,
DispatchMessage,
PeekMessage,
TranslateMessage,
WM_CAP_SET_CALLBACK_YIELD,
WinMain
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