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Creating a Frame Callback Function

The following example is a simple frame callback function. Register this callback by using the capSetCallbackOnFrame macro.

TCHAR gachBuffer[100];  // Global buffer.
DWORD gdwFrameNum = 0;

// FrameCallbackProc: frame callback function. 
// hWnd:              capture window handle. 
// lpVHdr:            pointer to structure containing captured 
//                        frame information. 
// 
LRESULT PASCAL FrameCallbackProc(HWND hWnd, LPVIDEOHDR lpVHdr) 
{ 
    if (!hWnd) 
        return FALSE; 
 
    _stprintf_s(gachBuffer, TEXT("Preview frame# %ld "), gdwFrameNum++); 
    SetWindowText(hWnd, gachBuffer); 
    return (LRESULT) TRUE ; 
}

Using Video Capture

 

 

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