.NET网络通信基础（1）

 1.了解Socket

 

  Socket自提出以来一直就是网络应用程序最重要且应用最为广泛的技术

 通过Socket概念进行网络联机，可以避免处理切割数据封包、分段传输与数据重组等繁复的细节。

 

2. 命名空间

System.Net.Sockets命名空间主要包括Sockets网络通信应用程序的相关类：

◦Socket类

◦TCPClient类

◦TCPListener类

◦UDPClient类

 

◦

NetworkStream类

 

 

◦

 

3. Socket类的方法成员

Bind方法

 

}Accept方法

}Connect方法

}Send方法和SendTo方法

}

 

SocketException类

 

 

 

Close方法和Shutdown方法 Receive方法和ReceiveFrom方法

 

 

4.服务器端的代码

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Text;
using System.Windows.Forms;
using System.Net;
using System.Net.Sockets;
using System.Threading;
namespace TcpServer
{
    public partial class Server : Form
    {
        delegate void ControlChangeHandler(string msg1,string msg2);

        int port;
        TcpListener myTcpListener;
        NetworkStream myNetworkStream;

        private void StartListen()
        {
            port = Convert.ToInt32(this.txtPort.Text.Trim());
            myTcpListener = new TcpListener(port);
            try
            {
                myTcpListener.Start();
                string msg = "等待联机中........";
                this.Invoke(new ControlChangeHandler(onChange), new object[] { msg,""});
                Socket mySocket = myTcpListener.AcceptSocket();
                while (true)
                {
                    if (mySocket.Connected)
                    {
                        msg = "通信端口" + txtPort.Text + "联机成功";
                        this.Invoke(new ControlChangeHandler(onChange), new object[] { msg, "" });
                        myNetworkStream = new NetworkStream(mySocket);
                        string Message;
                        byte[] data = new byte[1024];
                        myNetworkStream.Read(data, 0, data.Length);
                        Message = Encoding.ASCII.GetString(data);
                        this.Invoke(new ControlChangeHandler(onChange), new object[] { "", Message  });
                    }
                }
            }
            catch (SocketException ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

        private void Send()
        {
            string Message = this.txtMsg.Text;
            byte[] data = Encoding.ASCII.GetBytes(Message);
            myNetworkStream.Write(data,0,data.Length );
        }

        private void onChange(string msg1, string msg2)
        {
            if (msg1 != "")
            {
                this.txtConnection.Text += msg1 + "/r/n";
            }
            if (msg2 != "")
            {
                this.txtMsg.Text += msg2 + "/r/n";
            }
        }

        public Server()
        {
            InitializeComponent();
        }

        private void btnListen_Click(object sender, EventArgs e)
        {
            Thread th = new Thread(new ThreadStart(this.StartListen ));
            th.IsBackground = true;
            th.Start();
        }

        private void btnSend_Click(object sender, EventArgs e)
        {
            this.Send();
        }
    }
}

 

5.客户端的代码

 using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Windows.Forms;
using System.Text;
using System.Net;
using System.Net.Sockets;
using System.Threading;
namespace TCPClient
{
    public partial class Client : Form
    {

        delegate void ControlChangeHandler(string msg);

        private TcpClient myTcpClient = new TcpClient();
        private NetworkStream myNetworkStream;

        private void Connect()
        {
            try
            {
                string HostName = this.txtServer.Text;
                int port = Convert.ToInt32(txtPort.Text);
                myTcpClient.Connect(IPAddress.Parse(HostName), port);
                myNetworkStream = myTcpClient.GetStream();
                string msg = "主机:" + HostName + "，通信端口:" + txtPort.Text + "连接成功";
                this.txtConnection.Text = msg;
                Thread th = new Thread(new ThreadStart(Read));
                th.IsBackground = true;
                th.Start();
            }
            catch (Exception e)
            {
                MessageBox.Show(e.Message );
            }
        }

        private void Send()
        {
            string Msg = this.txtMsg.Text;
            byte[] data = Encoding.ASCII.GetBytes(Msg);
            myNetworkStream.Write(data,0,data.Length );

        }

        private void Read()
        {
            while (true)
            {
                if (myTcpClient.Connected)
                {
                    int DataSize = myTcpClient.ReceiveBufferSize;
                    byte[] data = new byte[DataSize];
                    myNetworkStream.Read(data, 0, DataSize);
                    string Msg = Encoding.ASCII.GetString(data, 0, data.Length);
                    this.Invoke(new ControlChangeHandler(onChange), new object[] { Msg });
                }
            }
        }

        private void onChange(string msg)
        {
            this.txtMsg.Text = msg+"/r/n";
        }

        public Client()
        {
            InitializeComponent();
        }

        private void btnConnect_Click(object sender, EventArgs e)
        {
            this.Connect();
        }

        private void btnSend_Click(object sender, EventArgs e)
        {
            this.Send();
        }
    }
}