C#.net同步异步SOCKET通讯和多线程总结2

服务端：

using System.Net;

using System.Net.Sockets;

using System.Text;

using System.Threading;

Thread mythread ;

Socket socket;

// 清理所有正在使用的资源。

        protected override void Dispose( bool disposing )

         {

              try

　            {

　　          socket.Close();//释放资源

　　          mythread.Abort ( ) ;//中止线程

　            }

　            catch{ }

             if( disposing )

              {

                   if (components != null)

                   {

                       components.Dispose();

                   }

              }

              base.Dispose( disposing );

         }       

         public static IPAddress GetServerIP()

         {

              IPHostEntry ieh=Dns.GetHostByName(Dns.GetHostName());

              return ieh.AddressList[0];

         }

         private void BeginListen()

         {

              IPAddress ServerIp=GetServerIP();

              IPEndPoint iep=new IPEndPoint(ServerIp,8000);

              socket=new

                       Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp);

              byte[] byteMessage=new byte[100];

              this.label1.Text=iep.ToString();

              socket.Bind(iep);

//            do

              while(true)

              {

                   try

                   {

                       socket.Listen(5);

                       Socket newSocket=socket.Accept();

                       newSocket.Receive(byteMessage);

                       string sTime = DateTime.Now.ToShortTimeString ( ) ;

string msg=sTime+":"+"Message from:";

msg+=newSocket.RemoteEndPoint.ToString()+Encoding.Default.GetString(byteMessage);

                       this.listBox1.Items.Add(msg);

                   }

                   catch(SocketException ex)

                   {

                       this.label1.Text+=ex.ToString();

                   }

              }

//            while(byteMessage!=null);

         }

         //开始监听

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

         {

              try

              {

                   mythread = new Thread(new ThreadStart(BeginListen));

                   mythread.Start();

              }

              catch(System.Exception er)

              {

                   MessageBox.Show(er.Message,"完成",MessageBoxButtons.OK,MessageBoxIcon.Stop);

              }

         }

客户端：

using System.Net;

using System.Net.Sockets;

using System.Text;

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

         {

              BeginSend();      

         }

         private void BeginSend()

         {            

              string ip=this.txtip.Text;

              string port=this.txtport.Text;

              IPAddress serverIp=IPAddress.Parse(ip);           

              int serverPort=Convert.ToInt32(port);

              IPEndPoint iep=new IPEndPoint(serverIp,serverPort);

              byte[] byteMessage;

//            do

//            {

                   Socket socket=new Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp);

                   socket.Connect(iep);

                   byteMessage=Encoding.ASCII.GetBytes(textBox1.Text);

                   socket.Send(byteMessage);

                   socket.Shutdown(SocketShutdown.Both);

                   socket.Close();

//            }

//            while(byteMessage!=null);

         }

基于TCP协议的发送和接收端

TCP协议的接收端

using System.Net.Sockets ; //使用到TcpListen类

using System.Threading ; //使用到线程

using System.IO ; //使用到StreamReader类

         int port = 8000; //定义侦听端口号

         private Thread thThreadRead; //创建线程，用以侦听端口号，接收信息

         private TcpListener tlTcpListen; //侦听端口号

         private bool blistener = true; //设定标示位，判断侦听状态

         private NetworkStream nsStream; //创建接收的基本数据流

         private StreamReader srRead;

         private System.Windows.Forms.StatusBar statusBar1;

         private System.Windows.Forms.Button button1;

         private System.Windows.Forms.ListBox listBox1; //从网络基础数据流中读取数据

         private TcpClient tcClient ;

          private void Listen ( )

         {

              try

              {

                   tlTcpListen = new TcpListener ( port ) ; //以8000端口号来初始化TcpListener实例

                   tlTcpListen.Start ( ) ; //开始监听

                   statusBar1.Text = "正在监听..." ;

                   tcClient = tlTcpListen.AcceptTcpClient ( ) ; //通过TCP连接请求

                   nsStream = tcClient.GetStream ( ) ; //获取用以发送、接收数据的网络基础数据流

                   srRead=new StreamReader(nsStream);//以得到的网络基础数据流来初始化StreamReader实例

 

                   statusBar1.Text = "已经连接！";

 

                    while( blistener ) //循环侦听

                   {

                       string sMessage = srRead.ReadLine();//从网络基础数据流中读取一行数据

                       if ( sMessage == "STOP" ) //判断是否为断开TCP连接控制码

                       {

                            tlTcpListen.Stop(); //关闭侦听

                            nsStream.Close(); //释放资源

                            srRead.Close();

                            statusBar1.Text = "连接已经关闭！" ;

                            thThreadRead.Abort(); //中止线程

                            return;

                       }

                       string sTime = DateTime.Now.ToShortTimeString ( ) ; //获取接收数据时的时间

                       listBox1.Items.Add ( sTime + " " + sMessage ) ;

                   }

              }

              catch ( System.Security.SecurityException )

              {

                   MessageBox.Show ( "侦听失败！" , "错误" ) ;

              }

         }

         //开始监听

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

         {

              thThreadRead = new Thread ( new ThreadStart ( Listen ) );

              thThreadRead.Start();//启动线程          

              button1.Enabled=false;

         }

         // 清理所有正在使用的资源。

         protected override void Dispose( bool disposing )

         {

              try

              {

                   tlTcpListen.Stop(); //关闭侦听

                   nsStream.Close();

                   srRead.Close();//释放资源

                   thThreadRead.Abort();//中止线程

              }

              catch{}

              if( disposing )

              {

                   if (components != null)

                   {

                       components.Dispose();

                   }

             }

              base.Dispose( disposing );

         }

TCP协议的发送端

using System.Net.Sockets; //使用到TcpListen类

using System.Threading; //使用到线程

using System.IO; //使用到StreamWriter类

using System.Net; //使用IPAddress类、IPHostEntry类等

          private StreamWriter swWriter; //用以向网络基础数据流传送数据　

         private NetworkStream nsStream; //创建发送数据的网络基础数据流　

         private TcpClient tcpClient;

         private System.Windows.Forms.Button button1;

         private System.Windows.Forms.TextBox textBox1;

         private System.Windows.Forms.Button button2;

         private System.Windows.Forms.TextBox textBox2;

         private System.Windows.Forms.StatusBar statusBar1;

         private System.Windows.Forms.Label label1;

         private System.Windows.Forms.Label label2; //通过它实现向远程主机提出TCP连接申请　

         private bool tcpConnect = false; //定义标识符，用以表示TCP连接是否建立

          //连接　

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

         {

              IPAddress ipRemote ;

              try

              {

                   ipRemote = IPAddress.Parse ( textBox1.Text ) ;

              }

              catch //判断给定的IP地址的合法性

              {

                   MessageBox.Show ( "输入的IP地址不合法！" , "错误提示！" ) ;

                   return ;

              }

              IPHostEntry ipHost ;

              try

              {

                   ipHost = Dns.Resolve ( textBox1.Text ) ;　

              }

              catch //判断IP地址对应主机是否在线

              {

 

                   MessageBox.Show ("远程主机不在线！" , "错误提示！" ) ;

                   return ;

              }

              string sHostName = ipHost.HostName ;

              try

              {

                   TcpClient tcpClient = new TcpClient(sHostName,8000);//对远程主机的8000端口提出TCP连接申请

                   nsStream = tcpClient.GetStream();//通过申请，并获取传送数据的网络基础数据流　　

                   swWriter = new StreamWriter(nsStream);//使用获取的网络基础数据流来初始化StreamWriter实例

                   button1.Enabled = false ;

                   button2.Enabled = true ;

                   tcpConnect = true ;

                   statusBar1.Text = "已经连接！" ;

              }

              catch

              {

                   MessageBox.Show ( "无法和远程主机8000端口建立连接！" , "错误提示！" ) ;

                   return ;

              }

         }

          //发送

         private void button2_Click(object sender, System.EventArgs e)

         {

              if (textBox2.Text !="")

              {

                   swWriter.WriteLine(textBox2.Text);//刷新当前数据流中的数据

                   swWriter.Flush();

              }

              else

              {

                   MessageBox.Show("发送信息不能为空！","错误提示！");

              }

         }

         // 清理所有正在使用的资源。

         protected override void Dispose( bool disposing )

         {

              if ( tcpConnect )

              {

                   swWriter.WriteLine ( "STOP" ) ; //发送控制码　　

                   swWriter.Flush (); //刷新当前数据流中的数据　　

                   nsStream.Close (); //清除资源

                   swWriter.Close ();

              }

              if( disposing )

              {

                   if (components != null)

                   {

                       components.Dispose();

                   }

              }

              base.Dispose( disposing );

         }

异步套接字

BeginAccept

Public IAsyncResult BeginAccept{AsyncCallback callback,object state}

AsyncCallback异步回调方法 object state自定义对象， 返回IasyncResult

Using System;

Namespace mySocket

{

       Public class Stateobject

{

       Public StateObject(){构造函数逻辑}

}

}à>

Using System;

Using System.Net;

Using System.Net.Sockets;

Using System.Threading;

Using System.Text;

Namespace mysocket

{

       Public Class StateObject

{

       Public Socket worksocket=null;

       Public const int buffersize=1024;

       Public byte[] buffer=new byte[buffersize];

       Public StringBuilder sb=new StringBuilder();

       Public StateObject()

       {}

}

}

实现主机绑定和端口监听：

Private IPAddress myIP=IPAddress.Parse(“127.0.0.1”);

Private IPEndPoint MyServer;

Private Socket mySocket;

Private Socket Handler;

Private Static ManualResetEvent myreset =new ManualResetEvent(false);

Try

{

       IPHostEntry myhost=new IPHostEntry();

       Myhost=dns.gethostbyName(“”);

       String IPString =myhost.Addresslist[0].tostring();

       Myip=IPAddress.Parse(IPString);

}

Catch{MessageBox.Show(“您输入的IP地址格式不正确，重新输入！”);}

Try

{

       MyServer=new IPEndPoint(myIP,Int32.Parse(“Port”));

       Mysocket=new Socket(AddressFamily.InterNetwork,SocketType.Stream,Protocol.Tcp);

       Mysocket.Bind(Myserver);

       Mysocket.Listen(50);

       Thread thread=new Thread(new ThreadStart(target));

       Thread.Start();

}

Catch(Exception ee){}

线程target

Private void target()

{

       While(true)

{

       myReset.Reset();

       mysocket.BeginAccept(new AsyncCallBack(AcceptCallback),mysocket);

       myReset.WaitOne();

}

}

异步回调方法AcceptCallBack

Private void AcceptCallback(IAsyncResault ar)

{

       myReset.Set();

       Socket Listener=(Socket)ar.AsyncState;

       Handler=Listener.EndAccept(ar);

       StateObject state=new StateObject();

       State.workSocket=handler;

       Try

       {

       Byte[] byteData=System.Text.Encoding.BigEndianUnicode.GetBytes(“通话！”+”/n/r”);

    Handler.BeginSend(byuteData,0,byteData.Length,0,new AsyncCallback(SendCallback),handler);

}

Catch(Exception ee)

{MessageBox.Show(ee.Message);}

Thread thread=new Thread(new ThreadStart(begreceive));

Thread.Start();

}

 

多线程：

每个窗体自己都在不同的线程上面运行，如果需要在窗体之间交互，需要在线程之间交互

当线程sleep，系统就使之退出执行队列，当睡眠结束，系统产生时钟中断，使该线程回到执行队列中，回复线程的执行。

如果父线程先于子线程结束，那么子线程在父线程结束的时候被迫结束，Thread.Join()是父线程等待子线程结束。Abort带来的是不可回复的终止线程

起始线程为主线程，前台线程全部结束，则主线程可以终止，后台线程无条件终止。

前台线程不妨碍程序终止，一旦进程的所有前台线程终止，则clr调用任意一个还存活的后台线程的abort来彻底终止进程。

挂起，睡眠（阻塞，暂停）

Thread.Suspend不会使线程立即停止执行，直到线程到达安全点的时候它才可以将该线程挂起，如果线程尚未运行或这已经停止，则不能被挂起，调用thread.resume使另一个线程跳出挂起状态，继续执行。

一个线程不能对另一个线程调用sleep，但是可以suspend。

Lock可以把一段代码定义为互斥段critical section 互斥段在一个时刻内只允许一个线程进入执行，其他线程必须等待

多线程公用对象，不应该使用lock，monitor提供了线程共享资源的方案，monitor可以锁定一个对象，线程只有得到锁才可以对该对象进行操作

一个进程开始至少有一个主线程。系统加载程序时创建主执行线程

消息队列与线程相关

一开始创建线程就产生消息队列了，一个线程可以创建多个窗体,而发给这些窗体的消息都同意发送到同一个消息队列中了，消息结构中有msg.hwnd指出该条消息与哪个窗体相关

DispatchMessage()函数依照这个保证消息分派处理自动化而且不会出错。

线程控制方法：

Start线程开始运行

Sleep 是线程暂停一段指定时间

Suspend 线程在到达安全点后暂停

Abort 线程到达安全点后停止

Resume 重新启动挂起的线程

Join 当前线程等待其他线程运行结束。如果使用超时值，且线程在分配的时间内结束，方法返回true

安全点：代码中的某些位置，这些位置公共语言运行时可以安全的执行自动垃圾回收，即释放未使用的变量并回收内存，调用线程的abort和suspend方法时，公共语言运行时将分析代码并确定线程停止运行的适当位置。