因?yàn)樯洗文莻€獲取網(wǎng)絡(luò)時間失效了（使用的是37端口），獲取網(wǎng)絡(luò)時間并刷新本地時間（源碼1）

所以網(wǎng)上又找了一份代碼，使用的是123端口，雖然沒有測試成功，這里也做下記錄，估計(jì)是本機(jī)環(huán)境問題，過兩天再進(jìn)行測試一下。

// getNTPTime.cpp : 定義控制臺應(yīng)用程序的入口點(diǎn)。 //#include "stdafx.h"using namespace std;char *GetHostIP(char *strHost) { char *strIP = NULL;PHOSTENT hostinfo = gethostbyname(strHost); if(hostinfo != NULL) { strIP = inet_ntoa(*(struct in_addr *)*hostinfo->h_addr_list); } return strIP; } BOOL SetTimeout(SOCKET s, int nTime, BOOL bRecv) { int ret = ::setsockopt(s, SOL_SOCKET, bRecv ? SO_RCVTIMEO : SO_SNDTIMEO, (char *)&nTime, sizeof(nTime)); return ret != SOCKET_ERROR; } time_t getSNTPTime() { WSADATA wsa; WORD wVersionRequested; wVersionRequested = MAKEWORD(2, 0); if (WSAStartup(wVersionRequested , &wsa)!=0) { cerr << "--->>> Winsock Initialization failed." << endl;}time_t t = 0;vector<char *> vecTimeSvr; vecTimeSvr.push_back("ntp1.aliyun.com");vecTimeSvr.push_back("ntp2.aliyun.com");vecTimeSvr.push_back("ntp3.aliyun.com");vecTimeSvr.push_back("ntp4.aliyun.com");vecTimeSvr.push_back("ntp5.aliyun.com");vecTimeSvr.push_back("ntp6.aliyun.com");vecTimeSvr.push_back("ntp7.aliyun.com");/*vecTimeSvr.push_back("cn.pool.ntp.org"); vecTimeSvr.push_back("0.cn.pool.ntp.org"); vecTimeSvr.push_back("1.cn.pool.ntp.org"); vecTimeSvr.push_back("2.cn.pool.ntp.org"); vecTimeSvr.push_back("3.cn.pool.ntp.org"); vecTimeSvr.push_back("time.windows.com"); /* //開放本段，可以在列表中添加更多的NTP服務(wù)器vecTimeSvr.push_back("pool.ntp.org"); vecTimeSvr.push_back("north-america.pool.ntp.org"); vecTimeSvr.push_back("south-america.pool.ntp.org"); vecTimeSvr.push_back("africa.pool.ntp.org"); vecTimeSvr.push_back("ca.pool.ntp.org"); vecTimeSvr.push_back("uk.pool.ntp.org"); vecTimeSvr.push_back("us.pool.ntp.org"); vecTimeSvr.push_back("au.pool.ntp.org"); vecTimeSvr.push_back("time.nist.gov"); vecTimeSvr.push_back("time-nw.nist.gov"); vecTimeSvr.push_back("europe.pool.ntp.org"); vecTimeSvr.push_back("asia.pool.ntp.org"); vecTimeSvr.push_back("oceania.pool.ntp.org"); */SYSTEMTIME systime;for(size_t i = 0; i < vecTimeSvr.size(); ++i) { char *strHostName = vecTimeSvr[i]; char *strIP = GetHostIP(strHostName); int SIZE_SOCKADDR_IN = sizeof(SOCKADDR_IN); sockaddr_in SvrIp; SvrIp.sin_family = AF_INET; SvrIp.sin_addr.s_addr = inet_addr(strIP); SvrIp.sin_port = htons(37); int nLenRcv = 0; char szBuff[48] = {'\0'}; szBuff[0] = 3 | (4 << 3); SOCKET sSession = ::socket(AF_INET, SOCK_DGRAM, 0); SetTimeout(sSession, 6000, FALSE); if(SOCKET_ERROR != sendto(sSession, szBuff, 48, 0, (sockaddr*)&SvrIp, SIZE_SOCKADDR_IN)) { SetTimeout(sSession, 6000, TRUE); nLenRcv = recvfrom(sSession, szBuff, 48, 0, (sockaddr*)&SvrIp, &SIZE_SOCKADDR_IN); } else { cerr << "--->>> " << strHostName << ": " << strIP <<endl; cerr << "--->>> send SNTP request failed!" << endl; } closesocket(sSession); if(nLenRcv == 48) { t = 0; for(int i = 40; i <= 43; i++) { unsigned char c = (unsigned char)szBuff[i]; t = (t<<8) | c; } tm _t;t -= 2208988800L; // 1970.1.1 0:0:0 - 1900.1.1 0:0:0 localtime_s(&_t, &t); cerr << "--->>> SNTP's Time - " << (_t.tm_year + 1900) << "-" << (_t.tm_mon + 1) << "-" << (_t.tm_mday) << " " << _t.tm_hour << ":" << _t.tm_min << ":" << _t.tm_sec << endl; cerr << "--->>> " << strHostName << ": " << strIP <<endl; cerr << endl;systime.wYear = _t.tm_year +1900;systime.wMonth = _t.tm_mon + 1;systime.wDay = _t.tm_mday;systime.wHour = _t.tm_hour;systime.wMinute = _t.tm_min;systime.wSecond = _t.tm_sec;systime.wMilliseconds = 0;systime.wDayOfWeek = -1;SetLocalTime(&systime);break;} } if (t == 0){cerr << "--->>> recieve all SNTP's time is failed!" << endl; }return t; } int _tmain(int argc, _TCHAR* argv[]) {time_t t_1 = getSNTPTime();if (t_1 > 0){char strTime[50];ctime_s(strTime, sizeof(strTime), &t_1);cerr << "--->>> now is " << strTime << endl;}cerr << endl;system("pause");return 0; }

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