• 数字时钟


    /*-----------------------------------------
       DIGCLOCK.c -- Digital Clock
                     (c) Charles Petzold, 1998
      -----------------------------------------*/
     
    #include <windows.h>
    
    #define ID_TIMER    1
    
    LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;
    
    int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
                        PSTR szCmdLine, int iCmdShow)
    {
         static TCHAR szAppName[] = TEXT ("DigClock") ;
         HWND         hwnd ;
         MSG          msg ;
         WNDCLASS     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 ;
    
         if (!RegisterClass (&wndclass))
         {
              MessageBox (NULL, TEXT ("Program requires Windows NT!"), 
                          szAppName, MB_ICONERROR) ;
              return 0 ;
         }
    
         hwnd = CreateWindow (szAppName, TEXT ("Digital Clock"),
                              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 ;
         }
    
    void DisplayDigit (HDC hdc, int iNumber)
    {
         static BOOL  fSevenSegment [10][7] = {
                             1, 1, 1, 0, 1, 1, 1,     // 0
                             0, 0, 1, 0, 0, 1, 0,     // 1
                             1, 0, 1, 1, 1, 0, 1,     // 2
                             1, 0, 1, 1, 0, 1, 1,     // 3
                             0, 1, 1, 1, 0, 1, 0,     // 4
                             1, 1, 0, 1, 0, 1, 1,     // 5
                             1, 1, 0, 1, 1, 1, 1,     // 6
                             1, 0, 1, 0, 0, 1, 0,     // 7
                             1, 1, 1, 1, 1, 1, 1,     // 8
                             1, 1, 1, 1, 0, 1, 1 } ;  // 9
         static POINT ptSegment [7][6] = {
                              7,  6,  11,  2,  31,  2,  35,  6,  31, 10,  11, 10,
                              6,  7,  10, 11,  10, 31,   6, 35,   2, 31,   2, 11,
                             36,  7,  40, 11,  40, 31,  36, 35,  32, 31,  32, 11,
                              7, 36,  11, 32,  31, 32,  35, 36,  31, 40,  11, 40,
                              6, 37,  10, 41,  10, 61,   6, 65,   2, 61,   2, 41,
                             36, 37,  40, 41,  40, 61,  36, 65,  32, 61,  32, 41,
                              7, 66,  11, 62,  31, 62,  35, 66,  31, 70,  11, 70 } ;
         int          iSeg ;
         
         for (iSeg = 0 ; iSeg < 7 ; iSeg++)
              if (fSevenSegment [iNumber][iSeg])
                   Polygon (hdc, ptSegment [iSeg], 6) ;
    }
    
    void DisplayTwoDigits (HDC hdc, int iNumber, BOOL fSuppress)
    {
         if (!fSuppress || (iNumber / 10 != 0))
              DisplayDigit (hdc, iNumber / 10) ;
    
         OffsetWindowOrgEx (hdc, -42, 0, NULL) ;
         DisplayDigit (hdc, iNumber % 10) ;
         OffsetWindowOrgEx (hdc, -42, 0, NULL) ;
    }
    
    void DisplayColon (HDC hdc)
    {
         POINT ptColon [2][4] = { 2,  21,  6,  17,  10, 21,  6, 25,
                                  2,  51,  6,  47,  10, 51,  6, 55 } ;
    
         Polygon (hdc, ptColon [0], 4) ;
         Polygon (hdc, ptColon [1], 4) ;
    
         OffsetWindowOrgEx (hdc, -12, 0, NULL) ;
    }
    
    void DisplayTime (HDC hdc, BOOL f24Hour, BOOL fSuppress)
    {
         SYSTEMTIME st ;
    
         GetLocalTime (&st) ;
    
         if (f24Hour)
              DisplayTwoDigits (hdc, st.wHour, fSuppress) ;
         else
              DisplayTwoDigits (hdc, (st.wHour %= 12) ? st.wHour : 12, fSuppress) ;
    
         DisplayColon (hdc) ;
         DisplayTwoDigits (hdc, st.wMinute, FALSE) ;
         DisplayColon (hdc) ;
         DisplayTwoDigits (hdc, st.wSecond, FALSE) ;
    }
    
    LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
    {
         static BOOL   f24Hour, fSuppress ;
         static HBRUSH hBrushRed ;
         static int    cxClient, cyClient ;
         HDC           hdc ;
         PAINTSTRUCT   ps ;
         TCHAR         szBuffer [2] ;
    
         switch (message)
         {
         case WM_CREATE:
              hBrushRed = CreateSolidBrush (RGB (255, 0, 0)) ;
              SetTimer (hwnd, ID_TIMER, 1000, NULL) ;
    
                                                      // fall through
    
         case WM_SETTINGCHANGE:
              GetLocaleInfo (LOCALE_USER_DEFAULT, LOCALE_ITIME, szBuffer, 2) ;
              f24Hour = (szBuffer[0] == '1') ;
    
              GetLocaleInfo (LOCALE_USER_DEFAULT, LOCALE_ITLZERO, szBuffer, 2) ;
              fSuppress = (szBuffer[0] == '0') ;
    
              InvalidateRect (hwnd, NULL, TRUE) ;
              return 0 ;
    
         case WM_SIZE:
              cxClient = LOWORD (lParam) ;
              cyClient = HIWORD (lParam) ;
              return 0 ;
    
         case WM_TIMER:
              InvalidateRect (hwnd, NULL, TRUE) ;
              return 0 ;
    
         case WM_PAINT:
              hdc = BeginPaint (hwnd, &ps) ;
    
              SetMapMode (hdc, MM_ISOTROPIC) ;
              SetWindowExtEx (hdc, 276, 72, NULL) ;
              SetViewportExtEx (hdc, cxClient, cyClient, NULL) ;
    
              SetWindowOrgEx (hdc, 138, 36, NULL) ;
              SetViewportOrgEx (hdc, cxClient / 2, cyClient / 2, NULL) ;
    
              SelectObject (hdc, GetStockObject (NULL_PEN)) ;
              SelectObject (hdc, hBrushRed) ;
    
              DisplayTime (hdc, f24Hour, fSuppress) ;
    
              EndPaint (hwnd, &ps) ;
              return 0 ;
    
         case WM_DESTROY:
              KillTimer (hwnd, ID_TIMER) ;
              DeleteObject (hBrushRed) ;
              PostQuitMessage (0) ;
              return 0 ;
         }
         return DefWindowProc (hwnd, message, wParam, lParam) ;
    }

    运行结果:

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  • 原文地址:https://www.cnblogs.com/xing901022/p/2751902.html
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