網絡時間協議 --- 網絡對時程序

 1 // TCPIP time protocol.cpp : 定義控制檯應用程序的入口點。  2 //  3 
 4 #include "stdafx.h"
 5  #include <winsock2.h>
 6  #include <stdio.h>
 7  #pragma comment(lib,"WS2_32")
 8  class CInitSock  9  { 10  public: 11      CInitSock(BYTE minorVer=2,BYTE majorVer=2) 12  { 13  WSADATA wsaData; 14          WORD sockVersion = MAKEWORD(minorVer,majorVer); 15          if(::WSAStartup(sockVersion,&wsaData)!=0) 16  { 17              exit(0); 18  } 19  } 20      ~CInitSock() 21  { 22  ::WSACleanup(); 23  } 24  }; 25 CInitSock initSock; 26 void SetTimeFromTP(ULONG ulTime) 27 { 28  FILETIME ft; 29  SYSTEMTIME st; 30     st.wYear = 1900; 31     st.wMonth = 1; 32     st.wDay = 1; 33     st.wHour = 0; 34     st.wMinute = 0; 35     st.wSecond = 0; 36     st.wMilliseconds = 0; 37     SystemTimeToFileTime(&st,&ft); 38 
39     LONGLONG *pLLong=(LONGLONG*)&ft; 40     *pLLong +=(LONGLONG)10000000*ulTime; 41     FileTimeToSystemTime(&ft,&st); 42     SetSystemTime(&st); 43 } 44 int main() 45 { 46     SOCKET s = ::socket(AF_INET,SOCK_STREAM,IPPROTO_TCP); 47     if(s == INVALID_SOCKET) 48  { 49         printf("Failed socket()\n"); 50         return 0; 51  } 52  sockaddr_in servAddr; 53     servAddr.sin_family = AF_INET; 54     servAddr.sin_port = htons(37); 55 
56     servAddr.sin_addr.S_un.S_addr = inet_addr("18.145.0.30"); 57     if(::connect(s,(sockaddr*)&servAddr,sizeof(servAddr)) == -1) 58  { 59         printf("Failed connect()\n"); 60         return 0; 61  } 62 
63     ULONG ulTime = 0; 64     int nRecv = ::recv(s,(char*)&ulTime,sizeof(ulTime),0); 65     if(nRecv>0) 66  { 67         ulTime=ntohl(ulTime); 68  SetTimeFromTP(ulTime); 69         printf("成功與時間服務器的時間同步！\n"); 70  } 71     else
72  { 73         printf("時間服務器不能肯定當前時間!\n"); 74  } 75  ::closesocket(s); 76     return 0; 77 }

試了好多服務器IP地址，都很差使.....鬱悶....