vc 获取网络时间

方式1 :

#include <WinSock2.h>

#include <Windows.h>

#pragma comment(lib, "WS2_32")  // 链á′接ó到μ?WS2_32.lib     

class CInitSock

{     

public:     

    CInitSock(BYTE minorVer = 2, BYTE majorVer = 2)     

    {     

        // 初3?始ê?化ˉWS2_32.dll     

        WSADATA wsaData;     

        WORD sockVersion = MAKEWORD(minorVer, majorVer);     

        if(::WSAStartup(sockVersion, &wsaData) != 0)     

        {     

            exit(0);     

        }     

    }     

    ~CInitSock()     

    {        

        ::WSACleanup();      

    }     

};

CInitSock initS;

BOOL NistGetTime(LPFILETIME OutTime)

{

    BOOL bOk;

    struct hostent *host;

    bOk = FALSE;

    if (host = gethostbyname("time.nist.gov"))

    {

        SOCKET s;

        in_addr ia;

        CHAR IpText[32];

        memcpy(&ia, host->h_addr, host->h_length);

        lstrcpyA(IpText, inet_ntoa(ia));

        s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);

        if (s != INVALID_SOCKET)

        {

            sockaddr_in sac;

            memset(&sac, 0, sizeof(sac));

            sac.sin_family = AF_INET;

            sac.sin_port = htons(37);

            sac.sin_addr.s_addr = inet_addr(IpText);

            if (connect(s, (sockaddr*)&sac, sizeof(sac)) == 0)

            {

                ULONG nTime;

                if (recv(s, (PCHAR)&nTime, sizeof(nTime), 0) == sizeof(nTime))

                {

                    LONGLONG llt;

                    nTime = ntohl(nTime);

                    llt = 0x014F373BFDE04000;//1900.1.1

                    llt += LONGLONG(nTime) * 10000000;

                    memcpy(OutTime, &llt, sizeof(FILETIME));

                    bOk = TRUE;

                }

            }

            closesocket(s);

        }

    }

    return bOk;

}

int _tmain(int argc, _TCHAR* argv[])

{

    FILETIME ft;

    CInitSock initS;

    NistGetTime(&ft);

    SYSTEMTIME st;

    FileTimeToSystemTime(&ft,&st);

    return 0;

}

方式2 mfc:

CTime NistGetTime()

{

//时间同步

CSocket sockClient;

TIME_ZONE_INFORMATION tzinfo;

DWORD dwStandardDaylight;

long bias,sminute,shour;

vector <string> vi;

string strServer;

BOOL ret;

//将时间服务器放在一个VECTOR中。

strServer = "time.nist.gov";

vi.push_back(strServer); 

strServer = "time-a.nist.gov";

vi.push_back(strServer); 

strServer = "time-b.nist.gov";

vi.push_back(strServer); 

strServer = "time-nw.nist.gov";

vi.push_back(strServer); 

strServer = "nist1.nyc.certifiedtime.com";

vi.push_back(strServer); 

strServer = "time-b.nist.gov";

vi.push_back(strServer); 

//初始化CSocket

AfxSocketInit();

sockClient.Create();   //创建socket

dwStandardDaylight = GetTimeZoneInformation(&tzinfo); //获取时区与UTC的时间差 应该返回-8

bias = tzinfo.Bias;

if (dwStandardDaylight == TIME_ZONE_ID_INVALID) //函数执行失败

{

return; 

}

if (dwStandardDaylight == TIME_ZONE_ID_STANDARD) //标准时间有效

bias += tzinfo.StandardBias;

if (dwStandardDaylight == TIME_ZONE_ID_DAYLIGHT) //夏令时间

bias += tzinfo.DaylightBias;

shour = bias/60;

sminute = fmod((float)bias,60);

//循环判断服务器是否连接成功

for (int n=0; n < vi.size(); ++ n)

{

ret = sockClient.Connect(vi[n].c_str(),13);

if (1 == ret)

break;   

}

unsigned char nTime[100] = {0}; //临时接收数据要求足够的大

sockClient.Receive(nTime, sizeof(nTime)); //接收服务器发送来得的数据

sockClient.Close();    //关闭socket

CString strTime;

strTime.Format("%s",nTime);

int first=strTime.Find("-");

int second=strTime.Find("-",first+1);

int tfirst = strTime.Find(":");

int tsecond = strTime.Find(":",tfirst+1);

int hyear=2000+atoi(strTime.Mid(first-2,2));

int hmonth=atoi(strTime.Mid(first+1,2));

int hday=atoi(strTime.Mid(second+1,2));

int hhour=atoi(strTime.Mid(tfirst-2,2))-shour;

int hminute=atoi(strTime.Mid(tfirst+1,2))-sminute;

int hsecond=atoi(strTime.Mid(tsecond+1,2));

CTime temptime(hyear,hmonth,hday,hhour,hminute,hsecond);

return temptime;

}

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