套接字+Socket连接

制作加载中动画：

创建Panel，制作预制体，在Image游戏物体中添加DOTween插件，相关设置如下：

(此为DOTween Pro,需付费，也可按下面的数值编写代码解决)

Socket套接字

套接字就是将IP地址与主机端口号合并在一起后的数据，IP地址定位主机位置，端口号知道

通讯入口与出口，从而就可以实现主机的数据交换。

IP协议实现主机的网络定位

操作系统的端口实现数据的流入与流出

Socket编程基于传输层实现，所以需要指定协议类型（TCP或UDP）

TCP编程方法（C#）

字节长度关系

日常说的G，M，指的是数据容量

UTF-8编码是几个字节存储？

长度是从1个字节~6个字节存储，其中中文是3个字节

长度计量单位

B：一个字节（Byte）

KB:1024个B

MB:1024个KB

GB:1024个MB

TB:1024个GB

PB:1024个TB

手册：https://msdn.microsoft.com/zh-cn/

连接（三次握手）

同步连接

//创建套接字

Socket socket = new Socket(

AddressFamily.InterNetwork,
SocketType.Stream,
ProtocolType.Tcp

);

//调用连接方法

socket.Connect("IP地址",端口号）；

异步连接

//创建套接字

_TcpConnection = new Socket(AddressFamily.InterNetwork,
SocketType.Stream,
ProtocolType.Tcp);
_TcpConnection.BeginConnect(Host, Port, _EndConnect, null);

//_EndConnect回调函数中执行

_TcpConnection.EndConnect(ar); //ar异步连接结果

断开（四次挥手）

同步断开

//下次使用，会创建全新的套接字

_Socket.Disconnect(false);

//关闭套接字连接，释放资源

_Socket.Close();

异步断开

socket.BeginDisconnect(false,_EndDisconnect,null);

//EndDisconnect回调函数执行

socket.EndDisconnect(异步断开连接结果）；

socket.Close();

监听绑定（服务器开发）

Bind(）函数实现

接收

发送

Unity测试连接相关代码：

using System;
using System.Net.Sockets;
using UnityEngine;
using UnityEngine.Events;namespace HonorZhao
{public class TcpDriver : MonoBehaviour{#region Singletonprivate static readonly object _lock = new object();private static TcpDriver _Instance;public static TcpDriver One(){lock (_lock){if (_Instance == null){GameObject driver = new GameObject("TcpDriver");_Instance = driver.AddComponent<TcpDriver>();DontDestroyOnLoad(driver);}return _Instance;}}private void Awake(){if (_Instance != null && _Instance != this){Destroy(gameObject);}}#endregionpublic TCP_CONNECT_STATUS _ConnectStatus = TCP_CONNECT_STATUS.Default;public string Host = "";public int Port = 0;public UnityAction ConnectedAction;public UnityAction DisconnectedAction;private Socket _TcpConnection;public void BeginConnect(){if (_ConnectStatus != TCP_CONNECT_STATUS.Default) return;try{_TcpConnection = new Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp);_TcpConnection.BeginConnect(Host, Port, _EndConnect, null);_ConnectStatus = TCP_CONNECT_STATUS.BeginConnect;}catch (Exception ex){Debug.LogError($"[TCP] 连接初始化失败: {ex.Message}");_ConnectStatus = TCP_CONNECT_STATUS.Failed;DisconnectedAction?.Invoke();}}private void _EndConnect(IAsyncResult ar){try{_TcpConnection.EndConnect(ar);if (_TcpConnection.Connected){_ConnectStatus = TCP_CONNECT_STATUS.Connected;ConnectedAction?.Invoke();}}catch (Exception ex){Debug.LogError($"[TCP] 连接失败: {ex.Message}");_ConnectStatus = TCP_CONNECT_STATUS.Failed;DisconnectedAction?.Invoke();}}public void BeginDisconnect(){if (_TcpConnection == null) return;try{if (_TcpConnection.Connected){_TcpConnection.Shutdown(SocketShutdown.Both);}}finally{_TcpConnection?.Close();_TcpConnection = null;_ConnectStatus = TCP_CONNECT_STATUS.Default;DisconnectedAction?.Invoke();}}private void OnDestroy(){BeginDisconnect();}}
}

public enum TCP_CONNECT_STATUS
{Default,BeginConnect,Connected,Failed
}

using HonorZhao;
using System.Collections;
using System.Collections.Generic;
using System.Net.Sockets;
using UnityEngine;public class TestConnect : MonoBehaviour
{// Start is called before the first frame updatevoid Start(){TestConnection();}// 测试用例void TestConnection(){TcpDriver.One().Host = "echo.websocket.org";TcpDriver.One().Port = 7;TcpDriver.One().ConnectedAction += () => Debug.Log("Connected!");TcpDriver.One().DisconnectedAction += () => Debug.Log("Disconnected!");TcpDriver.One().BeginConnect();// 5秒后断开测试Invoke(nameof(DisconnectTest), 5f);}void DisconnectTest() => TcpDriver.One().BeginDisconnect();}