128 lines
4.6 KiB
C#
128 lines
4.6 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Net;
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using System.Net.Sockets;
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using System.Runtime.InteropServices;
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using System.Text;
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using System.Threading.Tasks;
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namespace JY.Inspection
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{
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/// <summary>
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/// 设置电脑时间
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/// </summary>
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public class DateTimeSynchronization
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{
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[StructLayout(LayoutKind.Sequential)]
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private struct Systemtime
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{
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public short year;
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public short month;
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public short dayOfWeek;
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public short day;
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public short hour;
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public short minute;
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public short second;
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public short milliseconds;
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}
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[DllImport("kernel32.dll")]
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private static extern bool SetLocalTime(ref Systemtime time);
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private static uint swapEndian(ulong x)
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{
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return (uint)(((x & 0x000000ff) << 24) +
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((x & 0x0000ff00) << 8) +
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((x & 0x00ff0000) >> 8) +
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((x & 0xff000000) >> 24));
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}
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/// <summary>
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/// 手动设置系统时间
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/// </summary>
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/// <param name="dt">需要设置的时间</param>
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/// <returns>返回系统时间设置状态，true为成功，false为失败</returns>
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public static bool SetLocalDateTime(DateTime dt)
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{
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Systemtime st;
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st.year = (short)dt.Year;
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st.month = (short)dt.Month;
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st.dayOfWeek = (short)dt.DayOfWeek;
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st.day = (short)dt.Day;
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st.hour = (short)dt.Hour;
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st.minute = (short)dt.Minute;
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st.second = (short)dt.Second;
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st.milliseconds = (short)dt.Millisecond;
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bool rt = SetLocalTime(ref st);
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return rt;
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}
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private static IPAddress iPAddress = null;
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/// <summary>
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/// 从NTP获取时间更新本地时间
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/// </summary>
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/// <param name="host"></param>
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/// <param name="syncDateTime"></param>
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/// <param name="message"></param>
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/// <returns></returns>
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public static bool Synchronization(string host, out DateTime syncDateTime, out string message)
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{
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syncDateTime = DateTime.Now;
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try
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{
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message = "";
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if (iPAddress == null)
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{
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var iphostinfo = Dns.GetHostEntry(host);
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var ntpServer = iphostinfo.AddressList[0];
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iPAddress = ntpServer;
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}
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DateTime dtStart = DateTime.Now;
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//NTP消息大小摘要是16字节 (RFC 2030)
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byte[] ntpData = new byte[48];
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//设置跳跃指示器、版本号和模式值
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// LI = 0 (no warning), VN = 3 (IPv4 only), Mode = 3 (Client Mode)
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ntpData[0] = 0x1B;
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IPAddress ip = iPAddress;
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// NTP服务给UDP分配的端口号是123
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IPEndPoint ipEndPoint = new IPEndPoint(ip, 123);
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// 使用UTP进行通讯
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Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
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socket.Connect(ipEndPoint);
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socket.ReceiveTimeout = 3000;
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socket.Send(ntpData);
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socket.Receive(ntpData);
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socket?.Close();
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socket?.Dispose();
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DateTime dtEnd = DateTime.Now;
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//传输时间戳字段偏移量，以64位时间戳格式，应答离开客户端服务器的时间
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const byte serverReplyTime = 40;
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// 获得秒的部分
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ulong intPart = BitConverter.ToUInt32(ntpData, serverReplyTime);
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//获取秒的部分
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ulong fractPart = BitConverter.ToUInt32(ntpData, serverReplyTime + 4);
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//由big-endian 到 little-endian的转换
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intPart = swapEndian(intPart);
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fractPart = swapEndian(fractPart);
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ulong milliseconds = (intPart * 1000) + ((fractPart * 1000) / 0x100000000UL);
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// UTC时间
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DateTime webTime = (new DateTime(1900, 1, 1, 0, 0, 0, DateTimeKind.Utc)).AddMilliseconds(milliseconds);
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//本地时间
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DateTime dt = webTime.ToLocalTime();
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bool isSuccess = SetLocalDateTime(dt);
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syncDateTime = dt;
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}
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catch (Exception ex)
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{
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message = ex.Message;
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return false;
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}
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return true;
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}
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}
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}
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