在VCKBASE、CSDN里挖了许久的坟，才找到一些有点用的资料，最后自己整理出这样的个函数，方面VC实现时间同步，多的不说，自己看源码，根据自己的需要可以适当修改源码：
[cpp]
view plaincopyprint?#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;
};
[cpp]
view plaincopyprint?/************************************************************************/
/* 函数说明:自动与时间服务器同步更新
/* 参数说明:无
/* 返 回 值:成功返回TRUE，失败返回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;
}
// 这个IP是中国大陆时间同步服务器地址，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;
// 获取时间服务器的时间
ntp_time = ntohl(NTP_Recv.transmit_timestamp_seconds)-2208988800;
lpLocalTime = localtime(&ntp_time);
if(lpLocalTime == NULL)
{
return FALSE;
}
// 获取新的时间
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;
// 设置时间精度
Splitseconds=(float)ntohl(NTP_Recv.transmit_timestamp_fractions);
Splitseconds=(float)0.000000000200 * Splitseconds;
Splitseconds=(float)1000.0 * Splitseconds;
newtime.wMilliseconds = (unsigned short)Splitseconds;
// 修改本机系统时间
SetLocalTime(&newtime);
return TRUE;
}
