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Creating an Error Callback Function

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The following example is a simple error callback function. Register this callback by using the capSetCallbackOnError macro.

TCHAR gachBuffer[100]; // Global buffer.

// ErrorCallbackProc: error callback function.

// hWnd:              capture window handle.

// nErrID:            error code for the encountered error.

// lpErrorText:       error text string for the encountered error.

//

LRESULT PASCAL ErrorCallbackProc(HWND hWnd, int nErrID,

    LPTSTR lpErrorText)

{

 

    if (!hWnd)

        return FALSE;

 

    if (nErrID == 0)            // Starting a new major function.

        return TRUE;            // Clear out old errors.

 

    // Show the error identifier and text.

    _stprintf_s(gachBuffer, TEXT("Error# %d"), nErrID);

 

    MessageBox(hWnd, lpErrorText, gachBuffer,

        MB_OK | MB_ICONEXCLAMATION);

 

    return (LRESULT) TRUE;

}