您的位置：首页 > 编程语言 > C语言/C++

vc++6.0 同步本机时间到Internet NTP服务器 编译通过

2010-11-17 08:44 435 查看
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
内容来自用户分享和网络整理，不保证内容的准确性，如有侵权内容，可联系管理员处理 点击这里给我发消息
标签： 
相关文章推荐
新的分享
章节导航