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- /*----------------------------------------
- BEEPER2.C -- Timer Demo Program No. 2
- (c) Charles Petzold, 1996
- ----------------------------------------*/
-
- #include <windows.h>
-
- #define ID_TIMER 1
-
- LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;
- VOID CALLBACK TimerProc (HWND, UINT, UINT, DWORD ) ;
-
- int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
- PSTR szCmdLine, int iCmdShow)
- {
- static char szAppName[] = "Beeper2" ;
- HWND hwnd ;
- MSG msg ;
- WNDCLASSEX wndclass ;
-
- wndclass.cbSize = sizeof (wndclass) ;
- wndclass.style = CS_HREDRAW | CS_VREDRAW ;
- wndclass.lpfnWndProc = WndProc ;
- wndclass.cbClsExtra = 0 ;
- wndclass.cbWndExtra = 0 ;
- wndclass.hInstance = hInstance ;
- wndclass.hIcon = LoadIcon (NULL, IDI_APPLICATION) ;
- wndclass.hCursor = LoadCursor (NULL, IDC_ARROW) ;
- wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ;
- wndclass.lpszMenuName = NULL ;
- wndclass.lpszClassName = szAppName ;
- wndclass.hIconSm = LoadIcon (NULL, IDI_APPLICATION) ;
-
- RegisterClassEx (&wndclass) ;
-
- hwnd = CreateWindow (szAppName, "Beeper2 Timer Demo",
- WS_OVERLAPPEDWINDOW,
- CW_USEDEFAULT, CW_USEDEFAULT,
- CW_USEDEFAULT, CW_USEDEFAULT,
- NULL, NULL, hInstance, NULL) ;
-
- while (!SetTimer (hwnd, ID_TIMER, 1000, (TIMERPROC) TimerProc))
- if (IDCANCEL == MessageBox (hwnd,
- "Too many clocks or timers!", szAppName,
- MB_ICONEXCLAMATION | MB_RETRYCANCEL))
- return FALSE ;
-
- ShowWindow (hwnd, iCmdShow) ;
- UpdateWindow (hwnd) ;
-
- while (GetMessage (&msg, NULL, 0, 0))
- {
- TranslateMessage (&msg) ;
- DispatchMessage (&msg) ;
- }
- return msg.wParam ;
- }
-
- LRESULT CALLBACK WndProc (HWND hwnd, UINT iMsg, WPARAM wParam, LPARAM lParam)
- {
- switch (iMsg)
- {
- case WM_DESTROY :
- KillTimer (hwnd, ID_TIMER) ;
- PostQuitMessage (0) ;
- return 0 ;
- }
- return DefWindowProc (hwnd, iMsg, wParam, lParam) ;
- }
-
- VOID CALLBACK TimerProc (HWND hwnd, UINT iMsg, UINT iTimerID, DWORD dwTime)
- {
- static BOOL fFlipFlop = FALSE ;
- HBRUSH hBrush ;
- HDC hdc ;
- RECT rc ;
-
- MessageBeep (0) ;
- fFlipFlop = !fFlipFlop ;
-
- GetClientRect (hwnd, &rc) ;
-
- hdc = GetDC (hwnd) ;
- hBrush = CreateSolidBrush (fFlipFlop ? RGB(255,0,0) : RGB(0,0,255)) ;
-
- FillRect (hdc, &rc, hBrush) ;
- ReleaseDC (hwnd, hdc) ;
- DeleteObject (hBrush) ;
- }
-