C# (统一)创建同步网络时间

Question

我一直在围绕着如何通过60个选择点最终同步20个物体的运动而旋转。我有几个主要的选择

• 使用同步vars同步点之间的进度(1到0)，但这是开放的滞后和相当密集的。
• 使用内置于网络转换中的统一，但就联网能力而言，这似乎很昂贵，因为其他设备只需要知道点和何时开始
• 首先，发送点列表，这是我成功完成的，然后使设备在一定的时间以固定的速度开始移动。

这就是我得出的结论，我需要有一个网络世界的时间精确到0.1秒左右，这样用户才能看到同样的运动。如果你认为这是一个错误的方法，请告诉我，因为我是一个网络初学者。

到目前为止，我已经尝试了三种方法来获得这个同步的时间。

1. 我使用System.DateTime，相信这是一个准确和普遍的时间，但在设备之间发现了超过一秒的变化。
2. 我试图计算这两个设备之间的延迟，以便计算并消除设备时间的变化。

- (A) Using the in built method of `GetAveragePing(NetworkPlayer player);` but this was old and depreciated as the NetworkPlayer class seemed to be no longer functional and compatible
- (B) Using another in built method of `GetCurrentRtt(int hostId, int connectionId, out byte error);` which returned 0 and again i believe may be depreciated
- (C) By sending a message from the Server to the Client and back then dividing the time taken by two but this seemed inaccurate as I was trying to calculate latency between the server and client which was not the same as between the client and server so not exactly half

​

1. 我试图从服务器访问一种形式的同步网络时间，通过

- (A) Using code from [here](https://stackoverflow.com/questions/1193955/how-to-query-an-ntp-server-using-c) to get a network time then worked out the System.DateTime difference between the network date time at a certain point so that i could synchronize them. The scripts which I used to do this are below.
- (B) Getting network time stamps from `GetNetworkTimestamp();` which I thought may be what i wanted

​

所以所有这些方法都失败了，所以今天我请求你们；

• 还有其他同步时间的方法吗？
• 这些方法中的一个应该有效吗?那么，我是否出错了?在这种情况下，我可以进一步详细说明我的问题和使用的代码。
• 我的社交方式是完全错误的，或者至少大部分是错误的，你建议我如何实现我想要的目标？

非常感谢你阅读了这篇文章，我希望它是详细和清晰的，如果我能帮助你提高你对我的问题的理解，我将非常乐意提供帮助。谢谢你的回答/启发意见。

网络时间代码

脚本A(获取网络时间)

using UnityEngine;
using System.Collections;
using System.Net;
using System.Net.Sockets;
using UnityEngine.UI;
public class GetNetworkTime : MonoBehaviour {

    public static System.DateTime NetworkTime()
    {
        //default Windows time server
        const string ntpServer = "time.windows.com";

        // NTP message size - 16 bytes of the digest (RFC 2030)
        var ntpData = new byte[48];

        //Setting the Leap Indicator, Version Number and Mode values
        ntpData[0] = 0x1B; //LI = 0 (no warning), VN = 3 (IPv4 only), Mode = 3 (Client Mode)

        var addresses = Dns.GetHostEntry(ntpServer).AddressList;

        //The UDP port number assigned to NTP is 123
        var ipEndPoint = new IPEndPoint(addresses[0], 123);
        //NTP uses UDP
        var socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);

        socket.Connect(ipEndPoint);

        //Stops code hang if NTP is blocked
        socket.ReceiveTimeout = 3000;

        socket.Send(ntpData);
        socket.Receive(ntpData);
        socket.Close();

        //Offset to get to the "Transmit Timestamp" field (time at which the reply 
        //departed the server for the client, in 64-bit timestamp format."
        const byte serverReplyTime = 40;

        //Get the seconds part
        ulong intPart = System.BitConverter.ToUInt32(ntpData, serverReplyTime);

        //Get the seconds fraction
        ulong fractPart = System.BitConverter.ToUInt32(ntpData, serverReplyTime + 4);

        //Convert From big-endian to little-endian
        intPart = SwapEndianness(intPart);
        fractPart = SwapEndianness(fractPart);

        var milliseconds = (intPart * 1000) + ((fractPart * 1000) / 0x100000000L);

        //**UTC** time
        var networkDateTime = (new System.DateTime(1900, 1, 1, 0, 0, 0, System.DateTimeKind.Utc)).AddMilliseconds((long)milliseconds);

        //return networkDateTime.ToLocalTime();
        return networkDateTime;
    }

    // stackoverflow.com/a/3294698/162671
    static uint SwapEndianness(ulong x)
    {
        return (uint)(((x & 0x000000ff) << 24) +
                       ((x & 0x0000ff00) << 8) +
                       ((x & 0x00ff0000) >> 8) +
                       ((x & 0xff000000) >> 24));
    }
}

脚本B(差分计算器和时间记录器)

using UnityEngine;
using System.Collections;
using UnityEngine.Networking;
using UnityEngine.UI;

    public class SyncTime2 : NetworkBehaviour {

        public float serverTimeDif;
        public float clientTimeDif;

        GetNetworkTime GetNetworkTime;

        GameObject time;
        Text TimeLog;

        // Use this for initialization
        void Start () {
            GetNetworkTime = GetComponent<GetNetworkTime>();
            time = GameObject.Find("time");
            TimeLog = time.GetComponent<Text>();
            if (isServer)
            {
                serverTimeDif = (float)System.DateTime.UtcNow.TimeOfDay.TotalSeconds - (float) GetNetworkTime.NetworkTime().TimeOfDay.TotalSeconds;
                StartCoroutine("DisplayTime", serverTimeDif);
            }
            else
            {
                clientTimeDif = (float)System.DateTime.UtcNow.TimeOfDay.TotalSeconds - (float)GetNetworkTime.NetworkTime().TimeOfDay.TotalSeconds;
                StartCoroutine("DisplayTime", clientTimeDif);
            }
        }

        IEnumerator DisplayTime (float TimeDif)
        {
            for (;;)
            {
                TimeLog.text = "" + ((float)System.DateTime.UtcNow.TimeOfDay.TotalSeconds + TimeDif);
                // Log time so i can see if it is different on different devices
                yield return new WaitForSeconds(0.01f);
            }
        }
    }

Answer 1

嗯..。似乎只是简单地增加时差而不是减去它的工作和同步时间，所以

TimeLog.text = "" + ((float)System.DateTime.UtcNow.TimeOfDay.TotalSeconds - TimeDif);

我应该用

TimeLog.text = "" - ((float)System.DateTime.UtcNow.TimeOfDay.TotalSeconds + TimeDif);

如果有人能确认这是/不是正确的联网方法，我就认为这是一个答案。