c# 获取服务器时间.doc

C# 获取服务器时间 Posted on 2009-12-16 13:17 Pagan 阅读(1052) 评论(0) 编辑 收藏 代码 using System;using System.Net;using System.Net.Sockets;namespace SNTPTime / Leap indicator field values public enum _LeapIndicator NoWarning, / 0 - No warning LastMinute61, / 1 - Last minute has 61 seconds LastMinute59, / 2 - Last minute has 59 seconds Alarm / 3 - Alarm condition (clock not synchronized) /Mode field values public enum _Mode SymmetricActive, / 1 - Symmetric active SymmetricPassive, / 2 - Symmetric pasive Client, / 3 - Client Server, / 4 - Server Broadcast, / 5 - Broadcast Unknown / 0, 6, 7 - Reserved / Stratum field values public enum _Stratum Unspecified, / 0 - unspecified or unavailable PrimaryReference, / 1 - primary reference (e.g. radio-clock) SecondaryReference, / 2-15 - secondary reference (via NTP or SNTP) Reserved / 16-255 - reserved / / SNTPTimeClient 的摘要说明。 / / Public class members: / / LeapIndicator - Warns of an impending leap second to be inserted/deleted in the last / minute of the current day. (See the _LeapIndicator enum) / / VersionNumber - Version number of the protocol (3 or 4). / / Mode - Returns mode. (See the _Mode enum) / / Stratum - Stratum of the clock. (See the _Stratum enum) / / PollInterval - Maximum interval between successive messages. / / Precision - Precision of the clock. / / RootDelay - Round trip time to the primary reference source. / / RootDispersion - Nominal error relative to the primary reference source. / / ReferenceID - Reference identifier (either a 4 character string or an IP address). / / ReferenceTimestamp - The time at which the clock was last set or corrected. / / OriginateTimestamp - The time at which the request departed the client for the server. / / ReceiveTimestamp - The time at which the request arrived at the server. / / Transmit Timestamp - The time at which the reply departed the server for client. / / RoundTripDelay - The time between the departure of request and arrival of reply. / / LocalClockOffset - The offset of the local clock relative to the primary reference / source. / / Initialize - Sets up data structure and prepares for connection. / / Connect - Connects to the time server and populates the data structure. / / IsResponseValid - Returns true if received data is valid and if comes from / a NTP-compliant time server. / / ToString - Returns a string representation of the object. / / - / Structure of the standard NTP header (as described in RFC 2030) / 1 2 3 / 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 / +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ / |LI | VN |Mode | Stratum | Poll | Precision | / +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ / | Root Delay | / +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ / | Root Dispersion | / +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ / | Reference Identifier | / +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ / | | / | Reference Timestamp (64) | / | | / +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ / | | / | Originate Timestamp (64) | / | | / +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ / | | / | Receive Timestamp (64) | / | | / +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ / | | / | Transmit Timestamp (64) | / | | / +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ / | Key Identifier (optional) (32) | / +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ / | | / | | / | Message Digest (optional) (128) | / | | / | | / +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ / / - / / NTP Timestamp Format (as described in RFC 2030) / 1 2 3 / 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 / +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ / | Seconds | / +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ / | Seconds Fraction (0-padded) | / +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ / / public class SNTPTimeClient / NTP Data Structure Length private const byte NTPDataLength = 48; / NTP Data Structure (as described in RFC 2030) byte NTPData = new byteNTPDataLength; / Offset constants for timestamps in the data structure private const byte offReferenceID = 12; private const byte offReferenceTimestamp = 16; private const byte offOriginateTimestamp = 24; private const byte offReceiveTimestamp = 32; private const byte offTransmitTimestamp = 40; / Leap Indicator public _LeapIndicator LeapIndicator get / Isolate the two most significant bits byte val = (byte)(NTPData0 6); switch (val) case 0: return _LeapIndicator.NoWarning; case 1: return _LeapIndicator.LastMinute61; case 2: return _LeapIndicator.LastMinute59; case 3: default: return _LeapIndicator.Alarm; / Version Number public byte VersionNumber get / Isolate bits 3 - 5 byte val = (byte)(NTPData0 & 0x38) 3); return val; / Mode public _Mode Mode get / Isolate bits 0 - 3 byte val = (byte)(NTPData0 & 0x7); switch (val) case 0: case 6: case 7: default: return _Mode.Unknown; case 1: return _Mode.SymmetricActive; case 2: return _Mode.SymmetricPassive; case 3: return _Mode.Client; case 4: return _Mode.Server; case 5: return _Mode.Broadcast; / Stratum public _Stratum Stratum get byte val = (byte)NTPData1; if (val = 0) return _Stratum.Unspecified; else if (val = 1) return _Stratum.PrimaryReference; else if (val = 15) return _Stratum.SecondaryReference; else return _Stratum.Reserved; / Poll Interval public uint PollInterval get return (uint)Math.Round(Math.Pow(2, NTPData2); / Precision (in milliseconds) public double Precision get return (1000 * Math.Pow(2, NTPData3); / Root Delay (in milliseconds) public double RootDelay get int temp = 0; temp = 256 * (256 * (256 * NTPData4 + NTPData5) + NTPData6) + NTPData7; return 1000 * (double)temp) / 0x10000); / Root Dispersion (in milliseconds) public double RootDispersion get int temp = 0; temp = 256 * (256 * (256 * NTPData8 + NTPData9) + NTPData10) + NTPData11; return 1000 * (double)temp) / 0x10000); / Reference Identifier public string ReferenceID get string val = ; switch (Stratum) case _Stratum.Unspecified: case _Stratum.PrimaryReference: val += Convert.ToChar(NTPDataoffReferenceID + 0); val += Convert.ToChar(NTPDataoffReferenceID + 1); val += Convert.ToChar(NTPDataoffReferenceID + 2); val += Convert.ToChar(NTPDataoffReferenceID + 3); break; case _Stratum.SecondaryReference: / switch(VersionNumber) / / case 3: / Version 3, Reference ID is an IPv4 address / string Address = NTPDataoffReferenceID + 0.ToString() + . + / NTPDataoffReferenceID + 1.ToString() + . + / NTPDataoffReferenceID + 2.ToString() + . + / NTPDataoffReferenceID + 3.ToString(); / try / / IPAddress RefAddr = new IPAddress(Address); / IPHostEntry Host = DNS.GetHostByAddr(RefAddr); / val = Host.Hostname + ( + Address + ); / / catch(Exception) / / val = N/A; / / / break; / case 4: / Version 4, Reference ID is the timestamp of last update / DateTime time = ComputeDate(GetMilliSeconds(offReferenceID); / / Take care of the time zone / long offset = TimeZone.CurrentTimeZone.GetUTCOffset(DateTime.Now); / TimeSpan offspan = TimeSpan.FromTicks(offset); / val = (time + offspan).ToString(); / break; / default: / val = N/A; / break; return val; / Reference Timestamp public DateTime ReferenceTimestamp get DateTime time = ComputeDate(GetMilliSeconds(offReferenceTimestamp); / Take care of the time zone long offset = Convert.ToInt64(TimeZone.CurrentTimeZone.GetUtcOffset(DateTime.Now); TimeSpan offspan = TimeSpan.FromTicks(offset); return time + offspan; / Originate Timestamp public DateTime OriginateTimestamp get return ComputeDate(GetMilliSeconds(offOriginateTimestamp); / Receive Timestamp public DateTime ReceiveTimestamp get DateTime time = ComputeDate(GetMilliSeconds(offReceiveTimestamp); / Take care of the time zone long offset = TimeZone.CurrentTimeZone.GetUtcOffset(DateTime.Now).Ticks; TimeSpan offspan = TimeSpan.FromTicks(offset); return time + offspan; / Transmit Timestamp public DateTime TransmitTimestamp get DateTime time = ComputeDate(GetMilliSeconds(offTransmitTimestamp); / Take care of the time zone long offset = TimeZone.CurrentTimeZone.GetUtcOffset(DateTime.Now).Ticks; TimeSpan offspan = TimeSpan.FromTicks(offset); return time + offspan; set SetDate(offTransmitTimestamp, value); / Reception Timestamp public DateTime ReceptionTimestamp; / Round trip delay (in milliseconds) public int RoundTripDelay get TimeSpan span = (ReceiveTimestamp - OriginateTimestamp) + (ReceptionTimestamp - TransmitTimestamp); return (int)span.TotalMilliseconds; / Local clock offset (in milliseconds) public int LocalClockOffset get TimeSpan span = (ReceiveTimestamp - OriginateTimestamp) - (ReceptionTimestamp - TransmitTimestamp); return (int)(span.TotalMilliseconds / 2); / Compute date, given the number of milliseconds since January 1, 1900 private DateTime ComputeDate(ulong milliseconds) TimeSpan span = TimeSpan.FromMilliseconds(double)milliseconds); DateTime time = new DateTime(1900, 1, 1); time += span; return time; / Compute the number of milliseconds, given the offset of a 8-byte array private ulong GetMilliSeconds(byte offset) ulong intpart = 0, fractpart = 0; for (int i = 0; i = 3; i+) intpart = 256 * intpart + NTPDataoffset + i; for (int i = 4; i = 0; i-) NTPDataoffset + i = (byte)(temp % 256); temp = temp / 256; temp = fractpart; for (int i = 7; i = 4; i-) NTPDataoffset + i = (byte)(temp % 256); temp = temp / 256; / Initialize the NTPClient data private void Initialize() / Set version number to 4 and Mode to 3 (client) NTPData0 = 0x1B; / Initialize all other fields with 0 for (int i = 1; i 48; i+) NTPDatai = 0; / Initialize the transmit timestamp TransmitTimestamp = DateTime.Now; / Connect to the time server public void Connect() try IPAddress hostadd = IPAddress.Parse(TimeServer); I