vc++6.0 同步本机时间到Internet NTP服务器 编译通过

vc++6.0 同步本机时间到Internet NTP服务器 编译通过

2009-07-24 23:50

#include <windows.h>

#include <winsock.h>
#include <time.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;  
};

int APIENTRY WinMain(HINSTANCE hInstance,
                     HINSTANCE hPrevInstance,
                     LPSTR     lpCmdLine,
                     int       nCmdShow)
{
WORD wVersionRequested;
WSADATA wsaData;

wVersionRequested = MAKEWORD( 1, 1 );
if (0!=WSAStartup(wVersionRequested, &wsaData))
{
   WSACleanup();
   return 0;
}

if (LOBYTE(wsaData.wVersion)!=1 || HIBYTE(wsaData.wVersion)!=1)
{
   WSACleanup( );
   return 0;
}
SOCKET soc=socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP);

struct sockaddr_in addrSrv;
addrSrv.sin_addr.S_un.S_addr=inet_addr("192.43.244.18");
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 0;
}
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 0;
}
closesocket(soc);
WSACleanup();

SYSTEMTIME newtime;
struct tm *lpLocalTime;
float Splitseconds;
time_t ntp_time=ntohl(NTP_Recv.transmit_timestamp_seconds)-2208988800;
lpLocalTime=localtime(&ntp_time);
if(lpLocalTime==NULL)
{
   return 0;
}

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;

Splitseconds=(float)ntohl(NTP_Recv.transmit_timestamp_fractions);  
Splitseconds=(float)0.000000000200 * Splitseconds;  
Splitseconds=(float)1000.0 * Splitseconds;  
newtime.wMilliseconds   =   (unsigned   short)Splitseconds;  
SetLocalTime(&newtime);
return 0;
}

 

 

原文网址: http://hi.baidu.com/paty/blog/item/b7b58db708ba79fd31add13e.html

从授时服务器上获得时间(非常详尽)http://blog.csdn.net/shjte/archive/2010/04/29/5543420.aspx

NTP服务器列表: http://support.ntp.org/bin/view/Servers/NTPPoolServers