C#通讯编程（整理）Socket通讯

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public class XmlSocket

    {

 

        //异步socket诊听

        // Incoming data from client.从客户端传来的数据

        public static string data = null;

 

        // Thread signal.线程 用一个指示是否将初始状态设置为终止的布尔值初始化 ManualResetEvent 类的新实例。

        public static ManualResetEvent allDone = new ManualResetEvent(false);

        //static void Main(string[] args)

        //{

        //    StartListening();

        //}

 

        public static void StartListening()

        {

            // Data buffer for incoming data. 传入数据缓冲

            byte[] bytes = new Byte[1024];

            // Establish the local endpoint for the socket. 建立本地端口

            // The DNS name of the computer

            // running the listener is "host.contoso.com".

 

            IPAddress ipAddress;

            String ipString = ConfigurationManager.AppSettings.Get("SocketIP");

            if (ipString==null || ipString ==String.Empty)

            {

                IPHostEntry ipHostInfo = Dns.GetHostEntry(Dns.GetHostName());

                ipAddress = ipHostInfo.AddressList[0];

            }

            else

            {

                ipAddress = IPAddress.Parse(ipString);

            }

 

            int port;

            String portString = ConfigurationManager.AppSettings.Get("SocketPort");

            if (portString==null || portString==String.Empty)

            {

                port = 11001;

            }

            else

            {

                port = int.Parse(portString);

            }

            IPEndPoint localEndPoint = new IPEndPoint(ipAddress, port);

 

            // Create a TCP/IP socket.

            Socket listener = new Socket(AddressFamily.InterNetwork,

             SocketType.Stream, ProtocolType.Tcp);

 

            // Bind the socket to the local endpoint and listen for incoming connections.绑定端口和数据

            try

            {

                listener.Bind(localEndPoint);

                listener.Listen(100);

 

                while (true)

                {

                    // Set the event to nonsignaled state.设置无信号状态的事件

                    allDone.Reset();

                    // Start an asynchronous socket to listen for connections.重新 启动异步连接

                    listener.BeginAccept(new AsyncCallback(AcceptCallback), listener);

                    // Wait until a connection is made before continuing.等待连接创建后继续

                    allDone.WaitOne();

                }

            }

            catch (Exception e)

            {

                //

            }

        }

 

        public static void AcceptCallback(IAsyncResult ar)

        {

            try

            {

                // Signal the main thread to continue.接受回调方法 该方法的此节向主应用程序线程发出信号，

                //让它继续处理并建立与客户端的连接

                allDone.Set();

                // Get the socket that handles the client request.获取客户端请求句柄

                Socket listener = (Socket)ar.AsyncState;

                Socket handler = listener.EndAccept(ar);

                // Create the state object.

                StateObject state = new StateObject();

                state.workSocket = handler;

                handler.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,

                 new AsyncCallback(ReadCallback), state);

            }

            catch (Exception e)

            {

                //

            }

        }

 

        /// <summary>

        /// 与接受回调方法一样，读取回调方法也是一个 AsyncCallback 委托。

        /// 该方法将来自客户端套接字的一个或多个字节读入数据缓冲区，然后再次调用 BeginReceive 方法，直到客户端发送的数据完成为止。

        /// 从客户端读取整个消息后，在控制台上显示字符串，并关闭处理与客户端的连接的服务器套接字。

        /// </summary>

        /// <param name="ar">IAsyncResult 委托</param>

        public static void ReadCallback(IAsyncResult ar)

        {

            try

            {

                String content = String.Empty;

                // Retrieve the state object and the handler socket创建自定义的状态对象 from the asynchronous state object.

                StateObject state = (StateObject)ar.AsyncState;

                Socket handler = state.workSocket;//处理的句柄

                // Read data from the client socket. 读出

                int bytesRead = handler.EndReceive(ar);

                if (bytesRead > 0)

                {

                    //业务代码

                    string result = DoSomeThing(...);

                    String len = Encoding.UTF8.GetBytes(result)

.Length.ToString().PadLeft(8, '0');

                    log.writeLine(len);

                    Send(len + result, handler);

                }

            }

            catch (Exception e)

            {

                //

            }

 

        }

        private static void Send(String data, Socket handler)

        {

            try

            {

                // Convert the string data to byte data using UTF8 encoding.

                byte[] byteData = Encoding.UTF8.GetBytes(data);

                // Begin sending the data to the remote device.

                handler.BeginSend(byteData, 0, byteData.Length, 0,

                 new AsyncCallback(SendCallback), handler);

            }

            catch (Exception e)

            {

                //

            }

        }

        /// <summary>

        /// 发送

        /// </summary>

        /// <param name="ar"></param>

        private static void SendCallback(IAsyncResult ar)

        {

            try

            {

                // Retrieve the socket from the state object.

                Socket handler = (Socket)ar.AsyncState;

 

                // Complete sending the data to the remote device.向远端发送数据

                int bytesSent = handler.EndSend(ar);

                StateObject state = new StateObject();

                state.workSocket = handler;

 

                handler.BeginReceive(state.buffer, 0, StateObject.BufferSize

, 0,new AsyncCallback(ReadCallback), state);

                handler.Shutdown(SocketShutdown.Both);

                handler.Close();

            }

            catch (Exception e)

            {

//

            }

        }

 

        public static void StopListening()

        {

            allDone.Close();

            log.close();

        }

 

        /// <summary>

        /// 具体处理业务的方法

        /// </summary>

        /// <returns></returns>

        private static string DoSomething(int i)

        {

            //具体业务代码,返回需要返回的字符串信息

        }

        /// <summary>

        /// 写日志方法

        /// </summary>

        /// <param name="strLog">写入内容</param>

        public static void WriteLog(string strLog)

        {

             //写入日志代码

        }

    }




/// 线程执行体,转发消息 

        /// </summary> 

        /// <param name="obj">传递给线程执行体的用户名，用以与用户通信 </param> 

        private void ThreadFunc(object obj) 

        { 

            //通过转发表得到当前用户套接字 

            Socket clientSkt = _transmit_tb[obj] as Socket; 

          //主循环 

            while (true) 

            { 

                try 

                { //接受第一个数据包。 

                    //由于程序逻辑结构简单，所以在这里对客户机发送的第一个包内容作逐一判断， 

                    //这里的实现不够优雅，但不失为此简单模型的一个解决之道。 

                    byte[] packetBuff = new byte[_maxPacket]; 

                    clientSkt.Receive(packetBuff); 

                    string _str = Encoding.Unicode.GetString(packetBuff).TrimEnd('\0'); 

                    //如果是发给不在线好友的信息 

                    if (_str.StartsWith("cmd::FriendMessage")) 

                    { 

                        string UserName 

= _str.Substring("cmd::FriendMessage".Length, 20).Trim(); 

                        string MessageS 

= _str.Substring("cmd::FriendMessage".Length + 20

, _str.Length - "cmd::FriendMessage".Length - 20); 

                        SaveMessage(obj as string, UserName, MessageS); 

                        continue; 

                    } 

                    //如果是离线请求 

                    if (_str.StartsWith("cmd::RequestLogout")) 

                    { 

                        _transmit_tb.Remove(obj); 

                        UpdateFriendList((string)obj, false, ""); 

                      //  string svrlog = string.Format("[系统消息]用户 {0} 在 {1} 已断开... 当前在线人数: {2}\r\n\r\n", obj, DateTime.Now, _transmit_tb.Count); 

                      //  Console.WriteLine(svrlog); 

                        //向所有客户机发送系统消息 

                       

                        //foreach (DictionaryEntry de in _transmit_tb) 

                        //{ 

                        //    string _clientName = de.Key as string; 

                        //    Socket _clientSkt = de.Value as Socket; 

                        //    _clientSkt.Send(Encoding.Unicode.GetBytes(svrlog)); 

                        //} 

                        Thread.CurrentThread.Abort(); 

                    } 

                    //如果是请求好友列表 

                    if (_str.StartsWith("cmd::RequestFriendList")) 

                    { 

                        SerializeFriendList(obj, clientSkt);                      

                        // 将该用户不在线时的信息发送给用户 

                        DataTable TabMessage = ReadMessage(obj as string); 

                        if (TabMessage != null) 

                        { 

                            foreach (DataRow myrow in TabMessage.Rows) 

                            { 

                                if (myrow["SendUserName"].ToString() 

== "System::Message") 

                                { 

                                    clientSkt.Send(

Encoding.Unicode.GetBytes(myrow["Message"].ToString())); 

                                } 

                                else 

                                { 

                                    clientSkt.Send(

Encoding.Unicode.GetBytes("cmd::FriendMessage" 

+ myrow["SendUserName"].ToString().PadRight(20, ' ') 

+ myrow["Message"].ToString())); 

                                } 

                            } 

                        } //这里不需要再继续接受后继数据包了，跳出当前循环体。 

                        continue; 

                    } 

                    ////如果是请求好友列表 

                    //if (_str.StartsWith("cmd::RequestOnLineList")) 

                    //{ 

                    //    byte[] onlineBuff = SerializeOnlineList(); 

                    //    //先发送响应信号，用户客户机的判断 

                    //    clientSkt.Send(Encoding.Unicode.GetBytes("cmd::RequestOnLineList")); 

                    //    clientSkt.Send(onlineBuff); 

                    //    //这里不需要再继续接受后继数据包了，跳出当前循环体。 

                    //    continue; 

                    //} //查找用户 

                    if (_str.StartsWith("Find::FindFriend")) 

                    { 

                        DataTable TabFind = TabUser.Clone(); 

                        DataRow [] FindRow =null  ; 

                        string UserName 

= _str.Substring("Find::FindFriend".Length

, _str.Length - "Find::FindFriend".Length); 

                        if (UserName.Equals("Find::WhoOnLine")) 

                        { //看谁在线 

                            FindRow = TabUser.Select(" ZX = 1"); 

                        } 

                     else//精确查找 

                        { 

                            FindRow = TabUser.Select("UserName = '" + UserName + "'"); 

                        } 

                        foreach (DataRow myrow in FindRow) 

                        { 

                            TabFind.ImportRow(myrow); 

                        } 

               

                        clientSkt.Send(

Encoding.Unicode.GetBytes("Find::FindFriend")); 

                        IFormatter format = new BinaryFormatter(); 

                        MemoryStream stream = new MemoryStream(); 

                        format.Serialize(stream, TabFind); 

                        stream.Position = 0; 

                        byte[] ret = new byte[_maxPacket]; 

                        int count = 0; 

                        count = stream.Read(ret, 0, _maxPacket); 

                        while (count >0) 

                        { 

                            clientSkt.Send(ret); 

                          count =  stream.Read(ret, 0, _maxPacket); 

                        } 

                        clientSkt.Send(

Encoding.Unicode.GetBytes("Find::FindFriendEnd"));  

                        stream.Close(); 

                        TabFind = null; 

                        FindRow = null; //这里不需要再继续接受后继数据包了，跳出当前循环体。 

                        continue; 

                    } //请求添加好友 

                    if (_str.StartsWith("Find::AddFriendAsk")) 

                    { 

                        string UserName = 

_str.Substring("Find::AddFriendAsk".Length

, _str.Length - "Find::AddFriendAsk".Length); 

                        //通过转发表查找接收方的套接字 

                        if (_transmit_tb.Count != 0 

&& _transmit_tb.ContainsKey(UserName)) 

                        { 

                            Socket receiverSkt = _transmit_tb[UserName] as Socket; 

                            receiverSkt.Send(

Encoding.Unicode.GetBytes("Find::AddFriendAsk" 

+ obj as string)); 

                        } 

                        //这里不需要再继续接受后继数据包了，跳出当前循环体。 

                        continue; 

                    } 

                    //回复答应添加好友 

                    if (_str.StartsWith("Find::AddFriendYes")) 

                    { 

                        string UserName = 

_str.Substring("Find::AddFriendYes".Length

, _str.Length - "Find::AddFriendYes".Length); 

                      //// 保存数据 

                        DataTable TabmyFriend = new DataTable() ; 

                        //保存该用户 

                        TabmyFriend.ReadXml(MyPath + "\\UserFriend\\" 

+  obj as string + ".xml"); 

                        DataRow newRow = TabmyFriend.NewRow(); 

                        newRow["UserName"] = UserName; 

                        TabmyFriend.Rows.Add(newRow); 

                        TabmyFriend.WriteXml(MyPath + "\\UserFriend\\" 

+ obj as string + ".xml", XmlWriteMode.WriteSchema, false); 

                        //保存其好友 

                        TabmyFriend = new DataTable(); 

                        TabmyFriend.ReadXml(MyPath + "\\UserFriend\\" 

+ UserName + ".xml"); 

                        DataRow newRow1 = TabmyFriend.NewRow(); 

                        newRow1["UserName"] = obj as string; 

                        TabmyFriend.Rows.Add(newRow1); 

                        TabmyFriend.WriteXml(MyPath + "\\UserFriend\\" + UserName 

+ ".xml", XmlWriteMode.WriteSchema, false); 

                        TabmyFriend = null; 

                        SerializeFriendList(obj, clientSkt);

}

//"开始"按钮事件 

 

  private void button1_Click(object sender, System.EventArgs e) { 

 

   //取得预保存的文件名 

 

   string fileName=textBox3.Text.Trim(); 

 

   //远程主机 

 

   string hostName=textBox1.Text.Trim(); 

 

   //端口 

 

   int port=Int32.Parse(textBox2.Text.Trim()); 

 

   //得到主机信息 

 

   IPHostEntry ipInfo=Dns.GetHostByName(hostName); 

 

   //取得IPAddress[] 

 

   IPAddress[] ipAddr=ipInfo.AddressList; 

 

   //得到ip 

 

   IPAddress ip=ipAddr[0]; 

 

   //组合出远程终结点 

 

   IPEndPoint hostEP=new IPEndPoint(ip,port); 

 

   //创建Socket 实例 

 

   Socket socket=new Socket(AddressFamily.InterNetwork

,SocketType.Stream,ProtocolType.Tcp); 

 

   try 

 

   { 

 

   //尝试连接 

 

   socket.Connect(hostEP); 

 

   } 

 

   catch(Exception se) 

 

   { 

 

   MessageBox.Show("连接错误"+se.Message,"提示信息 

 

   ,MessageBoxButtons.RetryCancel,MessageBoxIcon.Information); 

 

  } 

 

  //发送给远程主机的请求内容串 

 

  string sendStr="GET / HTTP/1.1\r\nHost: " + hostName + 

 

  "\r\nConnection: Close\r\n\r\n"; 

 

   //创建bytes字节数组以转换发送串 

 

   byte[] bytesSendStr=new byte[1024]; 

 

   //将发送内容字符串转换成字节byte数组 

 

   bytesSendStr=Encoding.ASCII.GetBytes(sendStr); 

 

  try 

 

  { 

 

  //向主机发送请求 

 

  socket.Send(bytesSendStr,bytesSendStr.Length,0); 

 

  } 

 

  catch(Exception ce) 

 

   { 

 

   MessageBox.Show("发送错误:"+ce.Message,"提示信息 

 

   ,MessageBoxButtons.RetryCancel,MessageBoxIcon.Information); 

 

   } 

 

   //声明接收返回内容的字符串 

 

   string recvStr=""; 

 

   //声明字节数组，一次接收数据的长度为1024字节 

 

   byte[] recvBytes=new byte[1024]; 

 

   //返回实际接收内容的字节数 

 

   int bytes=0; 

 

  //循环读取，直到接收完所有数据 

 

  while(true) 

 

  { 

 

  bytes=socket.Receive(recvBytes,recvBytes.Length,0); 

 

  //读取完成后退出循环 

 

  if(bytes〈=0) 

 

  break; 

 

  //将读取的字节数转换为字符串 

 

  recvStr+=Encoding.ASCII.GetString(recvBytes,0,bytes); 

 

  } 

 

  //将所读取的字符串转换为字节数组 

 

  byte[] content=Encoding.ASCII.GetBytes(recvStr); 

 

   try 

 

   { 

 

   //创建文件流对象实例 

 

   FileStream fs=new FileStream(fileName,FileMode.OpenOrCreate

,FileAccess.ReadWrite); 

 

  //写入文件 

 

  fs.Write(content,0,content.Length); 

 

  } 

 

  catch(Exception fe) 

 

   { 

 

   MessageBox.Show("文件创建/写入错误:"+fe.Message,"提示信息"

,MessageBoxButtons.RetryCancel,MessageBoxIcon.Information); 

 

   } 

 

   //禁用Socket 

 

   socket.Shutdown(SocketShutdown.Both); 

 

   //关闭Socket 

 

   socket.Close(); 

 

   } 

 

   }