第八章 8-2 数字时钟

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这里写图片描述
1，获取当前时间 GetLocalTime

SYSTEMTIME st;typedef struct _SYSTEMTIME {    WORD wYear;    WORD wMonth;    WORD wDayOfWeek;    WORD wDay;    WORD wHour;    WORD wMinute;    WORD wSecond;    WORD wMilliseconds;} SYSTEMTIME, *PSYSTEMTIME, *LPSYSTEMTIME;GetLocalTime(&st);

2,数字时钟实例

#define ID_TIMER 1//根据窗口坐标，整个数字应该是倒过来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        1,0,1,1,1,0,1,//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    };//规划每一个数字8    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);    }}//显示两个数字    void DisplayTwoDigits(HDC hdc, int iNumber)    {        DisplayDigit(hdc, iNumber / 10);        OffsetWindowOrgEx(hdc, -42, 0, NULL);        DisplayDigit(hdc, iNumber % 10);        OffsetWindowOrgEx(hdc, -42, 0, NULL);    }//显示数字中间的冒号    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[1], 4);        Polygon(hdc, ptColon[0], 4);        OffsetWindowOrgEx(hdc, -12, 0, NULL);    }//数字时钟显示当前的时间    void DisplayTime(HDC hdc)    {        SYSTEMTIME st;        GetLocalTime(&st);//获取当前系统的时间        DisplayTwoDigits(hdc, st.wHour);        DisplayColon(hdc);        DisplayTwoDigits(hdc, st.wMinute);        DisplayColon(hdc);        DisplayTwoDigits(hdc, st.wSecond);    }LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam){    static HBRUSH hBrushRed;    RECT rect;    static int cxClient, cyClient;    switch (message)    {    case WM_SIZE:        cxClient = LOWORD(lParam);        cyClient = HIWORD(lParam);        break;    case WM_CREATE:        hBrushRed = CreateSolidBrush(RGB(255, 0, 0));       SetTimer(hWnd, ID_TIMER, 1000, NULL);        break;    case WM_TIMER:        InvalidateRect(hWnd, NULL,TRUE);        break;    case WM_PAINT:        {            PAINTSTRUCT ps;            HDC hdc = BeginPaint(hWnd, &ps);            // TODO: 在此处添加使用 hdc 的任何绘图代码...         /* DisplayTwoDigits(hdc, 17);          DisplayColon(hdc);          DisplayTwoDigits(hdc, 40);*/            //使用映射模式映射到整个窗口          SetMapMode(hdc, MM_ISOTROPIC);          SetWindowExtEx(hdc, 276, 72, NULL);          SetViewportExtEx(hdc, cxClient, cyClient, NULL);        //改变视口和窗口的坐标原点          SetViewportOrgEx(hdc, cxClient/2, cyClient/2, NULL);        SetWindowOrgEx(hdc, 138, 36, NULL);        //选择画笔和话刷          SelectObject(hdc, GetStockObject(NULL_PEN));          SelectObject(hdc, hBrushRed);          DisplayTime(hdc);            EndPaint(hWnd, &ps);        }        break;    case WM_DESTROY:        DeleteObject(hBrushRed);        KillTimer(hWnd, ID_TIMER);        PostQuitMessage(0);        break;    default:        return DefWindowProc(hWnd, message, wParam, lParam);    }    return 0;}

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