1、客户端
public class AsyncUdp { private Socket socket; private EndPoint localEP; private EndPoint remoteEP; private byte[] buffer = new byte[1024];//用于存放接收消息 public delegate void onDataReceive(byte[] data); public event onDataReceive OnDataReceive; /// <summary> /// 接收与发送 /// </summary> /// <param name="localPort"></param> /// <param name="remoteIp"></param> /// <param name="remotePort"></param> public AsyncUdp(int localPort, IPAddress remoteIp, int remotePort) { try { //创建一个Socket实例 socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp); //关联本地终结点 localEP =new IPEndPoint(IPAddress.Any, localPort); socket.Bind(localEP); //开始接收 remoteEP = new IPEndPoint(remoteIp, remotePort); this.socket.BeginReceiveFrom(buffer, 0, buffer.Length, SocketFlags.None, ref remoteEP, new AsyncCallback(ReceiveCallBack), null); } catch (Exception err) { throw (err); } } /// <summary> /// 发送 /// </summary> /// <param name="remoteIp"></param> /// <param name="remotePort"></param> public AsyncUdp(IPAddress remoteIp, int remotePort) { try { //创建一个Socket实例 socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp); remoteEP = new IPEndPoint(remoteIp, remotePort); } catch (Exception err) { throw (err); } } /// <summary> /// 接收 /// </summary> /// <param name="localPort"></param> public AsyncUdp(int localPort) { try { //创建一个Socket实例 socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp); //关联本地终结点 localEP = new IPEndPoint(IPAddress.Any, localPort); socket.Bind(localEP); this.socket.BeginReceive(buffer, 0, buffer.Length, SocketFlags.None, new AsyncCallback(ReceiveCallBack), null); } catch (Exception err) { throw (err); } } /// <summary> /// 接收消息的回调 /// </summary> /// <param name="ar"></param> private void ReceiveCallBack(IAsyncResult ar) { try { int length = socket.EndReceive(ar);//结束挂起的异步读取 byte[] data = new byte[length]; Array.Copy(buffer, 0, data, 0, data.Length); OnDataReceive(data);//接收的数据 if (remoteEP == null) { this.socket.BeginReceive(buffer, 0, buffer.Length, SocketFlags.None, new AsyncCallback(ReceiveCallBack), null); } else { this.socket.BeginReceiveFrom(buffer, 0, buffer.Length, SocketFlags.None, ref remoteEP, new AsyncCallback(ReceiveCallBack), null); } } catch (Exception err) { throw (err); } } /// <summary> /// 异步发送消息 /// </summary> /// <param name="data"></param> public void SendData(byte[] data) { try { if (socket != null && remoteEP != null) { socket.BeginSendTo(data, 0, data.Length, SocketFlags.None, remoteEP, new AsyncCallback(SendCallBack), null); } } catch (Exception err) { throw (err); } } /// <summary> /// 发送数据的回调 /// </summary> /// <param name="ar"></param> private void SendCallBack(IAsyncResult ar) { try { if (socket != null) { int length = socket.EndSend(ar);//结束挂起的异步发送 } } catch (Exception err) { MessageBox.Show(err.ToString()); } } /// <summary> /// 关闭 /// </summary> public void Close() { if (socket != null) { socket.Close(); } } }
2、服务端
/// <summary> /// SOCKET实现异步UDP服务器 /// </summary> public class AsyncSocketUDPServer { #region Fields /// <summary> /// 服务器程序允许的最大客户端连接数 /// </summary> private int _maxClient; /// <summary> /// 服务器使用的同步socket /// </summary> private Socket _serverSock; private bool disposed = false; /// <summary> /// 数据接受缓冲区 /// </summary> private byte[] _recvBuffer; #endregion #region Properties /// <summary> /// 服务器是否正在运行 /// </summary> public bool IsRunning { get; private set; } /// <summary> /// 监听的IP地址 /// </summary> public IPAddress Address { get; private set; } /// <summary> /// 监听的端口 /// </summary> public int Port { get; private set; } /// <summary> /// 通信使用的编码 /// </summary> public Encoding Encoding { get; set; } #endregion #region 构造函数 /// <summary> /// 异步Socket UDP服务器 /// </summary> /// <param name="listenPort">监听的端口</param> public AsyncSocketUDPServer(int listenPort) : this(IPAddress.Any, listenPort, 1024) { } /// <summary> /// 异步Socket UDP服务器 /// </summary> /// <param name="localEP">监听的终结点</param> public AsyncSocketUDPServer(IPEndPoint localEP) : this(localEP.Address, localEP.Port, 1024) { } /// <summary> /// 异步Socket UDP服务器 /// </summary> /// <param name="localIPAddress">监听的IP地址</param> /// <param name="listenPort">监听的端口</param> /// <param name="maxClient">最大客户端数量</param> public AsyncSocketUDPServer(IPAddress localIPAddress, int listenPort, int maxClient) { this.Address = localIPAddress; this.Port = listenPort; this.Encoding = Encoding.Default; _maxClient = maxClient; //_clients = new List<AsyncUDPSocketState>(); _serverSock = new Socket(localIPAddress.AddressFamily, SocketType.Dgram, ProtocolType.Udp); _recvBuffer = new byte[_serverSock.ReceiveBufferSize]; } #endregion #region Method /// <summary> /// 启动服务器 /// </summary> /// <returns>异步TCP服务器</returns> public void Start() { if (!IsRunning) { IsRunning = true; _serverSock.Bind(new IPEndPoint(this.Address, this.Port)); //_serverSock.Connect(new IPEndPoint(IPAddress.Any, 0)); AsyncSocketUDPState so = new AsyncSocketUDPState(); so.workSocket = _serverSock; _serverSock.BeginReceiveFrom(so.buffer, 0, so.buffer.Length, SocketFlags.None, ref so.remote, new AsyncCallback(ReceiveDataAsync), null); //EndPoint sender = new IPEndPoint(IPAddress.Any, 0); //_serverSock.BeginReceiveFrom(_recvBuffer, 0, _recvBuffer.Length, SocketFlags.None, // ref sender, new AsyncCallback(ReceiveDataAsync), sender); //BeginReceive 和 BeginReceiveFrom的区别是什么 /*_serverSock.BeginReceive(_recvBuffer, 0, _recvBuffer.Length, SocketFlags.None, * new AsyncCallback(ReceiveDataAsync), null);*/ } } /// <summary> /// 停止服务器 /// </summary> public void Stop() { if (IsRunning) { IsRunning = false; _serverSock.Close(); //TODO 关闭对所有客户端的连接 } } /// <summary> /// 接收数据的方法 /// </summary> /// <param name="ar"></param> private void ReceiveDataAsync(IAsyncResult ar) { AsyncSocketUDPState so = ar.AsyncState as AsyncSocketUDPState; //EndPoint sender = new IPEndPoint(IPAddress.Any, 0); int len = -1; try { len = _serverSock.EndReceiveFrom(ar, ref so.remote); //len = _serverSock.EndReceiveFrom(ar, ref sender); //EndReceiveFrom 和 EndReceive区别 //len = _serverSock.EndReceive(ar); //TODO 处理数据 //触发数据收到事件 RaiseDataReceived(so); } catch (Exception) { //TODO 处理异常 RaiseOtherException(so); } finally { if (IsRunning && _serverSock != null) _serverSock.BeginReceiveFrom(so.buffer, 0, so.buffer.Length, SocketFlags.None, ref so.remote, new AsyncCallback(ReceiveDataAsync), so); } } /// <summary> /// 发送数据 /// </summary> /// <param name="msg"></param> /// <param name="remote"></param> public void Send(string msg, EndPoint remote) { byte[] data = Encoding.Default.GetBytes(msg); try { RaisePrepareSend(null); _serverSock.BeginSendTo(data, 0, data.Length, SocketFlags.None, remote, new AsyncCallback(SendDataEnd), _serverSock); } catch (Exception) { //TODO 异常处理 RaiseOtherException(null); } } private void SendDataEnd(IAsyncResult ar) { ((Socket)ar.AsyncState).EndSendTo(ar); RaiseCompletedSend(null); } #endregion #region 事件 /// <summary> /// 接收到数据事件 /// </summary> public event EventHandler<AsyncSocketUDPEventArgs> DataReceived; private void RaiseDataReceived(AsyncSocketUDPState state) { if (DataReceived != null) { DataReceived(this, new AsyncSocketUDPEventArgs(state)); } } /// <summary> /// 发送数据前的事件 /// </summary> public event EventHandler<AsyncSocketUDPEventArgs> PrepareSend; /// <summary> /// 触发发送数据前的事件 /// </summary> /// <param name="state"></param> private void RaisePrepareSend(AsyncSocketUDPState state) { if (PrepareSend != null) { PrepareSend(this, new AsyncSocketUDPEventArgs(state)); } } /// <summary> /// 数据发送完毕事件 /// </summary> public event EventHandler<AsyncSocketUDPEventArgs> CompletedSend; /// <summary> /// 触发数据发送完毕的事件 /// </summary> /// <param name="state"></param> private void RaiseCompletedSend(AsyncSocketUDPState state) { if (CompletedSend != null) { CompletedSend(this, new AsyncSocketUDPEventArgs(state)); } } /// <summary> /// 网络错误事件 /// </summary> public event EventHandler<AsyncSocketUDPEventArgs> NetError; /// <summary> /// 触发网络错误事件 /// </summary> /// <param name="state"></param> private void RaiseNetError(AsyncSocketUDPState state) { if (NetError != null) { NetError(this, new AsyncSocketUDPEventArgs(state)); } } /// <summary> /// 异常事件 /// </summary> public event EventHandler<AsyncSocketUDPEventArgs> OtherException; /// <summary> /// 触发异常事件 /// </summary> /// <param name="state"></param> private void RaiseOtherException(AsyncSocketUDPState state, string descrip) { if (OtherException != null) { OtherException(this, new AsyncSocketUDPEventArgs(descrip, state)); } } private void RaiseOtherException(AsyncSocketUDPState state) { RaiseOtherException(state, ""); } #endregion #region Close /// <summary> /// 关闭一个与客户端之间的会话 /// </summary> /// <param name="state">需要关闭的客户端会话对象</param> public void Close(AsyncSocketUDPState state) { if (state != null) { //_clients.Remove(state); //_clientCount--; //TODO 触发关闭事件 } } /// <summary> /// 关闭所有的客户端会话,与所有的客户端连接会断开 /// </summary> public void CloseAllClient() { //foreach (AsyncUDPSocketState client in _clients) //{ // Close(client); //} //_clientCount = 0; //_clients.Clear(); } #endregion #region 释放 /// <summary> /// Performs application-defined tasks associated with freeing, /// releasing, or resetting unmanaged resources. /// </summary> public void Dispose() { Dispose(true); GC.SuppressFinalize(this); } /// <summary> /// Releases unmanaged and - optionally - managed resources /// </summary> /// <param name="disposing"><c>true</c> to release /// both managed and unmanaged resources; <c>false</c> /// to release only unmanaged resources.</param> protected virtual void Dispose(bool disposing) { if (!this.disposed) { if (disposing) { try { Stop(); if (_serverSock != null) { _serverSock = null; } } catch (SocketException) { //TODO RaiseOtherException(null); } } disposed = true; } } #endregion } public class AsyncSocketUDPState { // Client socket. public Socket workSocket = null; // Size of receive buffer. public const int BufferSize = 1024; // Receive buffer. public byte[] buffer = new byte[BufferSize]; // Received data string. public StringBuilder sb = new StringBuilder(); public EndPoint remote = new IPEndPoint(IPAddress.Any, 0); } /// <summary> /// SOCKET 异步UDP 事件类 /// </summary> public class AsyncSocketUDPEventArgs : EventArgs { /// <summary> /// 提示信息 /// </summary> public string _msg; /// <summary> /// 客户端状态封装类 /// </summary> public AsyncSocketUDPState _state; /// <summary> /// 是否已经处理过了 /// </summary> public bool IsHandled { get; set; } public AsyncSocketUDPEventArgs(string msg) { this._msg = msg; IsHandled = false; } public AsyncSocketUDPEventArgs(AsyncSocketUDPState state) { this._state = state; IsHandled = false; } public AsyncSocketUDPEventArgs(string msg, AsyncSocketUDPState state) { this._msg = msg; this._state = state; IsHandled = false; } }
