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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.Inte.Network,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(); } |
