在VCKBASE、CSDN裡挖了許久的墳，才找到一些有點用的資料，最後自己整理出這樣的個函式，方面VC實現時間同步，多的不說，自己看原始碼，根據自己的需要可以適當修改原始碼：

#include <WinSock.h> #pragma comment (lib,"Ws2_32") struct NTP_Packet { int Control_Word; int root_delay; int root_dispersion; int reference_identifier; __int64 reference_timestamp; __int64 originate_timestamp; __int64 receive_timestamp; int transmit_timestamp_seconds; int transmit_timestamp_fractions; };

/************************************************************************/ /* 函式說明:自動與時間伺服器同步更新 /* 引數說明:無 /* 返 回 值:成功返回TRUE，失敗返回FALSE /************************************************************************/ BOOL UpdateSysTime() { WORD wVersionRequested; WSADATA wsaData; // 初始化版本 wVersionRequested = MAKEWORD( 1, 1 ); if (0!=WSAStartup(wVersionRequested, &wsaData)) { WSACleanup(); return FALSE; } if (LOBYTE(wsaData.wVersion)!=1 || HIBYTE(wsaData.wVersion)!=1) { WSACleanup( ); return FALSE; } // 這個IP是中國大陸時間同步伺服器地址，可自行修改 SOCKET soc=socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP); struct sockaddr_in addrSrv; addrSrv.sin_addr.S_un.S_addr=inet_addr("210.72.145.44"); addrSrv.sin_family=AF_INET; addrSrv.sin_port=htons(123); NTP_Packet NTP_Send,NTP_Recv; NTP_Send.Control_Word = htonl(0x0B000000); NTP_Send.root_delay = 0; NTP_Send.root_dispersion = 0; NTP_Send.reference_identifier = 0; NTP_Send.reference_timestamp = 0; NTP_Send.originate_timestamp = 0; NTP_Send.receive_timestamp = 0; NTP_Send.transmit_timestamp_seconds = 0; NTP_Send.transmit_timestamp_fractions = 0; if(SOCKET_ERROR==sendto(soc,(const char*)&NTP_Send,sizeof(NTP_Send), 0,(struct sockaddr*)&addrSrv,sizeof(addrSrv))) { closesocket(soc); return FALSE; } int sockaddr_Size =sizeof(addrSrv); if(SOCKET_ERROR==recvfrom(soc,(char*)&NTP_Recv,sizeof(NTP_Recv), 0,(struct sockaddr*)&addrSrv,&sockaddr_Size)) { closesocket(soc); return FALSE; } closesocket(soc); WSACleanup(); SYSTEMTIME newtime; float Splitseconds; struct tm *lpLocalTime; time_t ntp_time; // 獲取時間伺服器的時間 ntp_time = ntohl(NTP_Recv.transmit_timestamp_seconds)-2208988800; lpLocalTime = localtime(&ntp_time); if(lpLocalTime == NULL) { return FALSE; } // 獲取新的時間 newtime.wYear =lpLocalTime->tm_year+1900; newtime.wMonth =lpLocalTime->tm_mon+1; newtime.wDayOfWeek =lpLocalTime->tm_wday; newtime.wDay =lpLocalTime->tm_mday; newtime.wHour =lpLocalTime->tm_hour; newtime.wMinute =lpLocalTime->tm_min; newtime.wSecond =lpLocalTime->tm_sec; // 設定時間精度 Splitseconds=(float)ntohl(NTP_Recv.transmit_timestamp_fractions); Splitseconds=(float)0.000000000200 * Splitseconds; Splitseconds=(float)1000.0 * Splitseconds; newtime.wMilliseconds = (unsigned short)Splitseconds; // 修改本機系統時間 SetLocalTime(&newtime); return TRUE; }

配套程式碼下載：http://download.csdn.net/detail/wangningyu/9649405