c#学习之Socket网络编程

我是新手以前没写过博客 希望大家勿喷，

在编写Socket的时候需要导入System.Net.Socket 命名空间。利用该类我们可以直接编写Socket的客户端和服务的的程序了，

这里我们只讲tpc协议下的Socket编程。

TCP Socket连接的过程可以简单的分为：①.服务端监听 ②.客户端请求 ③.建立连接，

在服务端：

（1）声明一个套接字（称为监听套接字）Socket serverSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);

（2）声明一个端点（EndPoint）上面提到过Socket需要跟它绑定才能通信。IPEndPoint endPoint = new IPEndPoint(IPAddress.Loopback, 8080);

（3）设置监听队列serverSocket.Listen(100);

（4）通过Accept（）方法来获取一个通信套接字（当有客户端连接时），这个方法会阻塞线程，避免界面卡死的现象，启动一个线程，把这个Accept（）放在线程函数里面。

在客户端：

（1）声明一个套接字，通过connect（）向服务器发起连接。

（2）通过Receive方法获取服务器发来的消息（这里同样启用一个线程，通过while循环来实时监听服务器端发送的消息）

注意：数据是以字节流（Byte[]）的形式传递的，我会使用Encoding.UTF8.GetString()方法来获取为字符串。都是通过Send（）来向彼此发送消息。

下面我们通过直接使用Socket类来构建一个简单的Socket应用程序，直接上代码吧 这是服务端代码。。

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.IO;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {

            Socket s = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            IPAddress ip = IPAddress.Any;
            IPEndPoint duan = new IPEndPoint(ip, );

            s.Bind(duan);
            textBox3.Text = "监听成功\n";
            //设置在同一时间点内连接的数量
            s.Listen();

            //等待用户连接
            Thread t = new Thread(A);
            t.IsBackground = true;
            t.Start(s);

        }
        Socket socketsend;
        Dictionary<string, Socket> dic = new Dictionary<string, Socket>();
        void A(object o)
        {
            while (true)
            {
                Socket s = o as Socket;
                socketsend = s.Accept();
                string name = socketsend.RemoteEndPoint.ToString();
                dic.Add(name, socketsend);
                comboBox1.Items.Add(name);
                textBox3.AppendText("连接成功\n" + name + "\n");
                Thread tt = new Thread(b);
                tt.Start(socketsend);

            }
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            Control.CheckForIllegalCrossThreadCalls = false;
        }
        public void b(object oo)
        {
            Socket socketsend = oo as Socket;
            while (true)
            {
                byte[] b = new byte[ *  * ];
                int a = socketsend.Receive(b);

                if (a == )
                {

                    break;
                }
                string receive = Encoding.Default.GetString(b, , a);
                textBox3.AppendText(receive + "\n");
            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
            byte[] by=  System.Text.Encoding.Default.GetBytes(textBox4.Text);
            List<byte> b = new List<byte>();
            b.Add();
            b.AddRange(by);
             byte []cc= b.ToArray();
            dic[comboBox1.SelectedItem.ToString()].Send(cc);
            //socketsend.Send(by);
        }

        private void button3_Click(object sender, EventArgs e)
        {
            OpenFileDialog dialog = new OpenFileDialog();
            dialog.Title = "请选择文件";
            dialog.InitialDirectory = @"C:\Users\PC\Desktop";
            dialog.Filter = "所有文件|*.*";
            dialog.ShowDialog();
            string name=  dialog.FileName;
            textBox5.Text = name;

        }

        private void button5_Click(object sender, EventArgs e)
        {
            using (FileStream f = new FileStream(textBox5.Text, FileMode.Open, FileAccess.Read))
            {
                byte[] b = new byte[ *  * ];
                int r = f.Read(b, , b.Length);
                List<byte> list = new List<byte>();
                list.Add();
                list.AddRange(b);
                byte[] newby = list.ToArray();
                dic[comboBox1.SelectedItem.ToString()].Send(newby, , r + , SocketFlags.None);
            }
        }

        private void button4_Click(object sender, EventArgs e)
        {
            byte[] a = new byte[];
            a[] = ;
            dic[comboBox1.SelectedItem.ToString()].Send(a);
        }

    }
}

下面是客户端代码。。

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Net.Sockets;
using System.Net;
using System.Threading;
using System.IO;

namespace WindowsFormsC
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        Socket ss;
        private void button1_Click(object sender, EventArgs e)
        {

           ss = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            IPAddress ip = IPAddress.Parse(textBox1.Text);
            IPEndPoint duan = new IPEndPoint(ip, Convert.ToInt32( textBox2.Text));
             ss.Connect(duan);
             a("连接服务端成功");
             Thread t = new Thread(b);
             t.Start();

        }
        void b()
        {
            while (true)
            {
                byte[] cc = new byte[ *  * ];
                int ac = ss.Receive(cc);
                if (ac == )
                {
                    break;
                }
                if (cc[]==)
                {

                    a(Encoding.Default.GetString(cc,, ac-));
                                                 //0 a length

                }
                else if (cc[]==)
                {
                    SaveFileDialog dia = new SaveFileDialog();
                    dia.Title = "请保存文件";
                    dia.InitialDirectory = @"C:\Users\PC\Desktop";
                    dia.Filter = "所有文件|*.*";
                    dia.ShowDialog(this);

                    using (FileStream s=new FileStream (dia.FileName,FileMode.OpenOrCreate,FileAccess.Write))
                    {
                        s.Write(cc,,ac-);
                        MessageBox.Show("保存成功","提示");
                    }

                }
                else if (cc[]==)
                {
                    for (int i = ; i < ; i++)
                    {
                        this.Location = new Point(, );
                        this.Location = new Point(, );

                    }

                }

            }

        }
        void a(string name)
        {
            textBox3.AppendText(name + "\t\n");
        }

        private void button2_Click(object sender, EventArgs e)
        {
            byte[] v = Encoding.Default.GetBytes(textBox4.Text);

            ss.Send(v);
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            Control.CheckForIllegalCrossThreadCalls = false;
        }
    }
}

小程序的功能可以发消息，震动，传输文件、、。。。

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