2019-08-02-C++控制台获取UTC和北京时间

2019-08-02-C++控制台获取UTC和北京时间

代码来源 https://www.2cto.com/kf/201209/152988.html

image.png

如果IP不可用，参考https://tf.nist.gov/tf-cgi/servers.cgi

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// CSTget.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"
#include <winsock2.h> 
#include <iostream>
#pragma comment(lib, "WS2_32")  // 链接到WS2_32.lib 
//using std;

class CInitSock
{
public:
	CInitSock(BYTE minorVer = 2, BYTE majorVer = 2)
	{
		// 初始化WS2_32.dll 
		WSADATA wsaData;
		WORD sockVersion = MAKEWORD(minorVer, majorVer);
		if (::WSAStartup(sockVersion, &wsaData) != 0)
		{
			exit(0);
		}
	}
	~CInitSock()
	{
		::WSACleanup();
	}
};


//#include "InitSock.h" 
#include <stdio.h> 
CInitSock initSock;

void SetTimeFromTP(ULONG ulTime)    // 根据时间协议返回的时间设置系统时间 
{
	// Windows文件时间是一个64位的值，它是从1601年1月1日中午12:00到现在的时间间隔， 
	// 单位是1/1000 0000秒，即1000万分之1秒（100-nanosecond ） 
	FILETIME ft;
	SYSTEMTIME st;

	// 首先将基准时间（1900年1月1日0点0分0秒0毫秒）转化为Windows文件时间     
	st.wYear = 1900;
	st.wMonth = 1;
	st.wDay = 1;
	st.wHour = 0;
	st.wMinute = 0;
	st.wSecond = 0;
	st.wMilliseconds = 0;
	SystemTimeToFileTime(&st, &ft);

	// 然后将Time Protocol使用的基准时间加上以及逝去的时间，即ulTime 
	LONGLONG *pLLong = (LONGLONG *)&ft;
	// 注意，文件时间单位是1/1000 0000秒，即1000万分之1秒（100-nanosecond ） 
	*pLLong += (LONGLONG)10000000 * ulTime;

	// 再将时间转化回来，更新系统时间 
	FileTimeToSystemTime(&ft, &st);
	
	std::cout << "UTC "<<st.wYear <<"年"<< st.wMonth << "月" << st.wDay<<"日" << st.wHour << "时" <<st.wMinute << "分" << st.wSecond << "秒\n";
	std::cout << "北京时间 " << st.wYear << "年" << st.wMonth << "月" << st.wDay+ (st.wHour + 8) / 24 << "日" << (st.wHour + 8)%24 << "时" << st.wMinute << "分" << st.wSecond << "秒\n";
	std::cout << "美东时间 " << st.wYear << "年" << st.wMonth << "月" << st.wDay - (st.wHour < 8 ? 1: 0 ) << "日" << (st.wHour - 8 +24) % 24 << "时" << st.wMinute << "分" << st.wSecond << "秒\n";
	

	SetSystemTime(&st);
}

int main()
{
	SOCKET s = ::socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
	if (s == INVALID_SOCKET)
	{
		printf(" Failed socket() \n");
		return 0;
	}

	// 填写远程地址信息，连接到时间服务器 
	sockaddr_in servAddr;
	servAddr.sin_family = AF_INET;
	servAddr.sin_port = htons(37);
	// 这里使用的时间服务器是129.132.2.21，更多地址请参考谷歌 https://tf.nist.gov/tf-cgi/servers.cgi ntp time server ip
	servAddr.sin_addr.S_un.S_addr = inet_addr("132.163.97.5");
	if (::connect(s, (sockaddr*)&servAddr, sizeof(servAddr)) == -1)
	{
		printf(" Failed connect() \n");
		return 0;
	}

	// 等待接收时间协议返回的时间。学习了Winsock I/O模型之后，最好使用异步I/O，以便设置超时 
	ULONG ulTime = 0;
	int nRecv = ::recv(s, (char*)&ulTime, sizeof(ulTime), 0);
	if (nRecv > 0)
	{
		ulTime = ntohl(ulTime);
		SetTimeFromTP(ulTime);
		//printf(" 成功与时间服务器的时间同步！\n");
		//std::cout << ulTime<<"\n";
	}
	else
	{
		printf(" 时间服务器不能确定当前时间！\n");
	}

	::closesocket(s);
	return 0;
}

改进版本：实时刷新但是不用占用网络资源，适合于短时间内动态查看。

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// WSTget.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"
#include <winsock2.h> 
#include <iostream>
#pragma comment(lib, "WS2_32")  // 链接到WS2_32.lib 
//using std;
#include <time.h> 
#include <windows.h>

class CInitSock
{
public:
	CInitSock(BYTE minorVer = 2, BYTE majorVer = 2)
	{
		// 初始化WS2_32.dll 
		WSADATA wsaData;
		WORD sockVersion = MAKEWORD(minorVer, majorVer);
		if (::WSAStartup(sockVersion, &wsaData) != 0)
		{
			exit(0);
		}
	}
	~CInitSock()
	{
		::WSACleanup();
	}
};


//#include "InitSock.h" 
#include <stdio.h> 
CInitSock initSock;


using namespace std;

void No_Cursor()
{
	HANDLE hOut;
	hOut = GetStdHandle(STD_OUTPUT_HANDLE);
	CONSOLE_CURSOR_INFO cci;
	cci.dwSize = 1;
	cci.bVisible = false;
	SetConsoleCursorInfo(hOut, &cci);
}

void gotoxy(short x, short y)
{
	COORD pos = { x,y };
	HANDLE hOut = GetStdHandle(STD_OUTPUT_HANDLE);
	SetConsoleCursorPosition(hOut, pos);
	No_Cursor();
}


void SetTimeFromTP(ULONG ulTime)    // 根据时间协议返回的时间设置系统时间 
{
	// Windows文件时间是一个64位的值，它是从1601年1月1日中午12:00到现在的时间间隔， 
	// 单位是1/1000 0000秒，即1000万分之1秒（100-nanosecond ） 
	FILETIME ft;
	SYSTEMTIME st;

	// 首先将基准时间（1900年1月1日0点0分0秒0毫秒）转化为Windows文件时间     
	st.wYear = 1900;
	st.wMonth = 1;
	st.wDay = 1;
	st.wHour = 0;
	st.wMinute = 0;
	st.wSecond = 0;
	st.wMilliseconds = 0;
	SystemTimeToFileTime(&st, &ft);

	// 然后将Time Protocol使用的基准时间加上以及逝去的时间，即ulTime 
	LONGLONG *pLLong = (LONGLONG *)&ft;
	// 注意，文件时间单位是1/1000 0000秒，即1000万分之1秒（100-nanosecond ） 
	*pLLong += (LONGLONG)10000000 * ulTime;

	// 再将时间转化回来，更新系统时间 
	FileTimeToSystemTime(&ft, &st);


	//std::cout << "UTC " << st.wYear << "Year" << st.wMonth << "Month" << st.wDay << "Day" << st.wHour << "Hour" << st.wMinute << "Minute" << st.wSecond << "Second\n";
	//std::cout << "CST " << st.wYear << "Year" << st.wMonth << "Month" << st.wDay + (st.wHour + 8) / 24 << "Day" << (st.wHour + 8) % 24 << "Hour" << st.wMinute << "Minute" << st.wSecond << "Second\n";
	//std::cout << "EST " << st.wYear << "Year" << st.wMonth << "Month" << st.wDay - (st.wHour < 8 ? 1 : 0) << "Day" << (st.wHour - 8 + 24) % 24 << "Hour" << st.wMinute << "Minute" << st.wSecond << "Second\n";
	
	while (1)
	{
		gotoxy(0, 0);
		std::cout << "                                                 \n                                                 \n                                                 \n";
		gotoxy(0, 0);
		std::cout << "CST " << st.wYear << "-" << st.wMonth << "-" << st.wDay + (st.wHour + 8) / 24 << " " << (st.wHour + 8) % 24 << ":" << st.wMinute << ":" << st.wSecond << "\n";
		gotoxy(0, 1);
		std::cout << "UTC " << st.wYear << "-" << st.wMonth << "-" << st.wDay << " " << st.wHour << ":" << st.wMinute << ":" << st.wSecond << "\n";
		gotoxy(0, 2);
		std::cout << "EST " << st.wYear << "-" << st.wMonth << "-" << st.wDay - (st.wHour < 8 ? 1 : 0) << " " << (st.wHour - 8 + 24) % 24 << ":" << st.wMinute << ":" << st.wSecond << "\n";
		
		Sleep(1000);

		st.wHour = st.wHour + (st.wMinute + 1) / 60;

		st.wMinute = st.wMinute + (st.wSecond + 1) / 60; //59jump?
		
		st.wSecond = (st.wSecond + 1) % 60;
	}

	//SetSystemTime(&st);
}

int func()
{
	SOCKET s = ::socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
	if (s == INVALID_SOCKET)
	{
		printf(" Failed socket() \n");
		return 0;
	}

	// 填写远程地址信息，连接到时间服务器 
	sockaddr_in servAddr;
	servAddr.sin_family = AF_INET;
	servAddr.sin_port = htons(37);
	// 这里使用的时间服务器是129.132.2.21，更多地址请参考谷歌 https://tf.nist.gov/tf-cgi/servers.cgi ntp time server ip
	servAddr.sin_addr.S_un.S_addr = inet_addr("132.163.97.5");
	if (::connect(s, (sockaddr*)&servAddr, sizeof(servAddr)) == -1)
	{
		printf(" Failed connect() \n");
		return 0;
	}

	// 等待接收时间协议返回的时间。学习了Winsock I/O模型之后，最好使用异步I/O，以便设置超时 
	ULONG ulTime = 0;
	int nRecv = ::recv(s, (char*)&ulTime, sizeof(ulTime), 0);
	if (nRecv > 0)
	{
		ulTime = ntohl(ulTime);
		SetTimeFromTP(ulTime);
		//printf(" 成功与时间服务器的时间同步！\n");
		//std::cout << ulTime<<"\n";
	}
	else
	{
		printf(" 时间服务器不能确定当前时间！\n");
	}

	::closesocket(s);
	return 0;
}

int main()
{
	func();
	
}