坦克大战 第六章 网络基础 之客户端：

using UnityEngine;

using System;

using System.Collections;

using System.Collections.Generic;

using System.Net;

using System.Net.Sockets;

using UnityEngine.UI;

public class Walk : MonoBehaviour

{

    //socket和缓冲区

    Socket socket;

    const int BUFFER_SIZE = 1024;

    public byte [] readBuff = new byte [BUFFER_SIZE];

    //玩家列表

    Dictionary < string , GameObject > players = new Dictionary < string , GameObject >();

    //消息列表

    List < string > msgList = new List < string >();

    //Player预设

    public GameObject prefab;

    //自己的IP和端口

    string id;

    //添加玩家

    void AddPlayer( string id, Vector3 pos)

    {

        GameObject player = ( GameObject )Instantiate(prefab, pos, Quaternion .identity);

        TextMesh textMesh = player.GetComponentInChildren< TextMesh >();

        textMesh.text = id;

        players.Add(id, player);

    }

    //发送位置协议

    void SendPos()

    {

        GameObject player = players[id];

        Vector3 pos = player.transform.position;

        //组装协议

        string str = "POS " ;

        str += id + " " ;

        str += pos.x.ToString() + " " ;

        str += pos.y.ToString() + " " ;

        str += pos.z.ToString() + " " ;

        byte [] bytes = System.Text. Encoding .Default.GetBytes(str);

        socket.Send(bytes);

        Debug .Log( "发送 " + str);

    }

    //发送离开协议

    void SendLeave()

    {

        //组装协议

        string str = "LEAVE " ;

        str += id + " " ;

        byte [] bytes = System.Text. Encoding .Default.GetBytes(str);

        socket.Send(bytes);

        Debug .Log( "发送 " + str);

    }

    //移动

    void Move()

    {

        if (id == "" )

            return ;

        GameObject player = players[id];

        //上

        if ( Input .GetKey( KeyCode .UpArrow))

        {

            player.transform.position += new Vector3 (0, 0, 1);

            SendPos();

        }

        //下

        else if ( Input .GetKey( KeyCode .DownArrow))

        {

            player.transform.position += new Vector3 (0, 0, -1); ;

            SendPos();

        }

        //左

        else if ( Input .GetKey( KeyCode .LeftArrow))

        {

            player.transform.position += new Vector3 (-1, 0, 0);

            SendPos();

        }

        //右

        else if ( Input .GetKey( KeyCode .RightArrow))

        {

            player.transform.position += new Vector3 (1, 0, 0);

            SendPos();

        }

    }

    //离开

    void OnDestory()

    {

        SendLeave();

    }

    //开始

    void Start ()

    {

        Connect();

        //请求其他玩家列表，略

        //把自己放在一个随机位置

        UnityEngine. Random .seed = ( int ) DateTime .Now.Ticks;

        float x = 100 + UnityEngine. Random .Range(-30, 30);

        float y = 0;

        float z = 100 + UnityEngine. Random .Range(-30, 30);

        Vector3 pos = new Vector3 (x, y, z);

        AddPlayer(id, pos);

        //同步

        SendPos();

    }

    //链接

    void Connect()

    {

        //Socket

        socket = new Socket ( AddressFamily .InterNetwork,

                                 SocketType .Stream, ProtocolType .Tcp);

        //Connect

        socket.Connect( "127.0.0.1" , 1234);

        id = socket.LocalEndPoint.ToString();

        //Recv

        socket.BeginReceive(readBuff, 0, BUFFER_SIZE, SocketFlags .None, ReceiveCb, null );

    }

    //接收回调

    private void ReceiveCb( IAsyncResult ar)

    {

        try

        {

            int count = socket.EndReceive(ar);

            //数据处理

            string str = System.Text. Encoding .UTF8.GetString(readBuff, 0, count);

            msgList.Add(str);

            //继续接收      

            socket.BeginReceive(readBuff, 0, BUFFER_SIZE, SocketFlags .None, ReceiveCb, null );

        }

        catch ( Exception e)

        {

            socket.Close();

        }

    }

    void Update ()

    {

        //处理消息列表

        for ( int i = 0; i < msgList.Count; i++)

            HandleMsg();

        //移动

        Move();

    }

    //处理消息列表

    void HandleMsg()

    {

        //获取一条消息

        if (msgList.Count <= 0)

            return ;

        string str = msgList[0];

        msgList.RemoveAt(0);

        //根据协议做不同的消息处理

        string [] args = str.Split( ' ' );

        if (args[0] == "POS" )

        {

            OnRecvPos(args[1], args[2], args[3], args[4]);

        }

        else if (args[0] == "LEAVE" )

        {

            OnRecvLeave(args[1]);

        }

    }

    //处理更新位置的协议

    public void OnRecvPos( string id, string xStr, string yStr, string zStr)

    {

        //不更新自己的位置

        if (id == this .id)

            return ;

        //解析协议

        float x = float .Parse(xStr);

        float y = float .Parse(yStr);

        float z = float .Parse(zStr);

        Vector3 pos = new Vector3 (x, y, z);

        //已经初始化该玩家

        if (players.ContainsKey(id))

        {

            players[id].transform.position = pos;

        }

        //尚未初始化该玩家

        else

        {

            AddPlayer(id, pos);

        }

    }

    //处理玩家离开的协议

    public void OnRecvLeave( string id)

    {

        if (players.ContainsKey(id))

        {

            Destroy(players[id]);

            players[id] = null ;

        }

    }

}