BRUSH) GetStockObject (WHITE_BRUSH) ; wndclass.lpszMenuName = NULL ; wndclass.lpszClassName = szAppName ; if (!RegisterClass (&wndclass)) { MessageBox ( NULL, TEXT ("Program requires Windows NT!"), szAppName, MB_ICONERROR) ; return 0 ; } hwnd = CreateWindow ( szAppName, TEXT ("Beeper1 Timer Demo"), WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, NULL, NULL, hInstance, NULL) ; ShowWindow (hwnd, iCmdShow) ; UpdateWindow (hwnd) ;
while (GetMessage (&msg, NULL, 0, 0)) { TranslateMessage (&msg) ; DispatchMessage (&msg) ; } return msg.wParam ; }
LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam,LPARAM lParam) { static BOOL fFlipFlop = FALSE ; HBRUSH hBrush ; HDC hdc ; PAINTSTRUCT ps ; RECT rc ; switch (message) { case WM_CREATE: SetTimer (hwnd, ID_TIMER, 1000, NULL) ; return 0 ;
case WM_TIMER : MessageBeep (-1) ; fFlipFlop = !fFlipFlop ; InvalidateRect (hwnd, NULL, FALSE) ; return 0 ; case WM_PAINT : hdc = BeginPaint (hwnd, &ps) ; GetClientRect (hwnd, &rc) ; hBrush = CreateSolidBrush (fFli |