C++ set the system time and system time network update methods

This article illustrates the method of C++ setting system time and updating system time network. Share with you for your reference. The specific implementation method is as follows:

//Set the system time 
 based on the time returned
void setTimeFromTP(ULONG ulTime)

{  

    FILETIME ft;  

    SYSTEMTIME st;  

  

    //Convert base time to Windows file time & NBSP; < br / >
    st.wYear = 1900;  

    st.wMonth = 1;  

    st.wDay = 1;  

    st.wHour = 0;  

    st.wMinute = 0;  

    st.wSecond = 0;  

    st.wMilliseconds = 0;  

  

    SystemTimeToFileTime(&st, &ft);  

  

    LONGLONG* pLLong = (LONGLONG*)&ft;  

    *pLLong += (LONGLONG)10000000*ulTime;  

    FileTimeToSystemTime(&ft, &st);  

    ::SetSystemTime(&st);  

}  

  

void main()  

{  

    CInitSock initSock;  

    SOCKET s = ::socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);  

    if (s == INVALID_SOCKET)  

    {  

        printf("socket error...");  

        return;  

    }  

    sockaddr_in servAddr = {0};  

    servAddr.sin_family = AF_INET;  

    servAddr.sin_port = ::htons(37);  

    servAddr.sin_addr.S_un.S_addr = ::inet_addr("69.25.96.13"); //Don't use the 210.72.145.44 IP, this is the usual TMD return value in heaven & PI; < br / >
    if (SOCKET_ERROR == ::connect(s, (sockaddr*)&servAddr, sizeof(servAddr)))  

    {  

        printf("connect error..");  

        return;  

    }  

  

    //Receiving time & NBSP; < br / >
    ULONG ulTime = 0;  

    int nRecv = ::recv(s, (char*)&ulTime, sizeof(ulTime), 0);  

    if (nRecv > 0)  //Receiving data & NBSP; < br / >
    {  

        ulTime = ::ntohl(ulTime);  

        setTimeFromTP(ulTime);  

    }  

    else  

    {  

        printf("recv error...");  

        return;  

    }  

      

    ::closesocket(s);  

    printf("*******************************");  

    getchar();  

}

Hope that the article described in the C++ programming to help you.