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capControlCallback
The capControlCallback function is the callback function used for precision control to begin and end
streaming capture. The capControlCallback callback function is a placeholder for the application-supplied function name.
LRESULT CALLBACK capControlCallback(
Parameters
hWnd
Handle of the capture window associated with the callback function.
nState
Current state of the capture operation. The CONTROLCALLBACK_PREROLL value is
sent initially to enable prerolling of the video sources and to return control
to the capture application at the exact moment recording is to begin. The
CONTROLCALLBACK_CAPTURING value is sent once per captured frame to indicate that
streaming capture is in progress and to enable the application to end capture.
Return Values
When nState is set to CONTROLCALLBACK_PREROLL, this callback function must return TRUE to
start capture or FALSE to abort it. When nState is set to CONTROLCALLBACK_CAPTURING, this callback function must return TRUE
to continue capture or FALSE to end it.
Remarks
The first message sent to the callback procedure sets the nState parameter to CONTROLCALLBACK_PREROLL after allocating all buffers and all
other capture preparations are complete.
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