CAPVIDEOCALLBACK callback function (vfw.h)
The capVideoStreamCallback function is the callback function used with streaming capture to optionally process a frame of captured video. The name capVideoStreamCallback is a placeholder for the application-supplied function name.
To set this callback for streaming capture, send the WM_CAP_SET_CALLBACK_VIDEOSTREAM message to the capture window or call the capSetCallbackOnVideoStream macro.
To set this callback for preview frame capture, send the WM_CAP_SET_CALLBACK_FRAME message to the capture window or call the capSetCallbackOnFrame macro.
Syntax
CAPVIDEOCALLBACK Capvideocallback;
LRESULT Capvideocallback(
HWND hWnd,
LPVIDEOHDR lpVHdr
)
{...}
Parameters
hWnd
Handle to the capture window associated with the callback function.
lpVHdr
Pointer to a VIDEOHDR structure containing information about the captured frame.
Return value
None
Remarks
The capture window calls a video stream callback function when a video buffer is marked done by the capture driver. When capturing to disk, this will precede the disk write operation.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows 2000 Professional [desktop apps only] |
| Minimum supported server | Windows 2000 Server [desktop apps only] |
| Target Platform | Windows |
| Header | vfw.h |