1 *-------------------------------------
2 BEEPER1.C -- Timer Demo Program No.1
3 (c) Charles Petzold, 1998
4 -------------------------------------*/
5
6 #include <Windows.h>
7
8 #define ID_TIMER 1
9
10 LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
11
12 int WINAPI WinMain( __in HINSTANCE hInstance
13 , __in_opt HINSTANCE hPrevInstance
14 , __in LPSTR lpCmdLine
15 , __in int nShowCmd )
16 {
17 static TCHAR szAppName[] = TEXT("Bepper1");
18 HWND hwnd;
19 MSG msg;
20 WNDCLASS wndclass;
21
22 wndclass.style = CS_HREDRAW | CS_VREDRAW;
23 wndclass.lpfnWndProc = WndProc;
24 wndclass.cbClsExtra = 0;
25 wndclass.cbWndExtra = 0;
26 wndclass.hInstance = hInstance;
27 wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
28 wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);
29 wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
30 wndclass.lpszMenuName = NULL;
31 wndclass.lpszClassName = szAppName;
32
33 if (!RegisterClass(&wndclass))
34 {
35 MessageBox(NULL, TEXT("Program requires Windows NT!")
36 , szAppName, MB_ICONERROR);
37 return 0;
38 }
39
40 hwnd = CreateWindow(szAppName, TEXT("Beeper1 Timer Demo")
41 , WS_OVERLAPPEDWINDOW
42 , CW_USEDEFAULT, CW_USEDEFAULT
43 , CW_USEDEFAULT, CW_USEDEFAULT
44 , NULL, NULL, hInstance, NULL);
45
46 ShowWindow(hwnd, nShowCmd);
47 UpdateWindow(hwnd);
48
49 while (GetMessage(&msg, NULL, 0, 0))
50 {
51 TranslateMessage(&msg);
52 DispatchMessage(&msg);
53 }
54
55 return msg.wParam;
56 }
57
58 LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
59 {
60 static BOOL fFlipFlop = FALSE;
61 HBRUSH hBrush;
62 HDC hdc;
63 PAINTSTRUCT ps;
64 RECT rc;
65
66 switch (message)
67 {
68 case WM_CREATE:
69 SetTimer(hwnd, ID_TIMER, 1000, NULL);
70 return 0;
71
72 case WM_TIMER:
73 MessageBeep(-1);
74 fFlipFlop = !fFlipFlop;
75 InvalidateRect(hwnd, NULL, FALSE);
76 return 0;
77
78 case WM_PAINT:
79 hdc = BeginPaint(hwnd, &ps);
80
81 GetClientRect(hwnd, &rc);
82 hBrush = CreateSolidBrush(fFlipFlop ? RGB(255, 0, 0) : RGB(0, 0, 255));
83 FillRect(hdc, &rc, hBrush);
84
85 EndPaint(hwnd, &ps);
86 DeleteObject(hBrush);
87 return 0;
88
89 case WM_DESTROY:
90 KillTimer(hwnd, ID_TIMER);
91 PostQuitMessage(0);
92 return 0;
93 }
94
95 return DefWindowProc(hwnd, message, wParam, lParam);
96 }
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