socket网络编程

private void Form1_Load(object sender, EventArgs e)
   {
 Control.CheckForIllegalCrossThreadCalls = false;
   }//在窗口加载时加上 `

 hread th1 = new Thread(Resive); th1.Start(s); th1.IsBackground = true; //变为后台线程 主线程结束时一块结束 

namespace WindowsFormsApp1
{
    public partial class Form1 : Form
    {
        Dictionary<string, Socket> dictoryso = new Dictionary<string, Socket>();
        public Form1()
        {
            InitializeComponent();
        }
 
        private void button1_Click(object sender, EventArgs e)
        {
                //创建负责监听的 socket
                Socket so = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);//必须ipv4荔浦
                                                                                                        //创建ip地址和端口类对象
                string s = txtServer.Text;
                IPAddress ip = IPAddress.Parse(s);
                IPEndPoint ioend = new IPEndPoint(ip, int.Parse(txtPort.Text));
                //让负责监听的socket绑定端口号
                so.Bind(ioend);//监听他
                show("监听成功");
                so.Listen(10);//设置能连接 这个服务器应用程序的最大数量

                Thread th = new Thread(Listen);
                th.IsBackground = true;//
                th.Start(so);//根据里式转换 父类 对象可以由子类赋值 父类也能转换成父类
        }
        Socket s;
       void Listen(object o) //引用类型
        {
           Socket so = o as Socket;
           while (true)
            {
                try
                {
                    //让负责 监听的socket 创建一个负责 通信的socket 
                    s = so.Accept();//  一直等待客户端的连接 如果没有就一直卡着    
                                    //获取连接端的 IP及端口
                    dictoryso.Add(s.RemoteEndPoint.ToString(), s);
                    comboBox1.Items.Add(s.RemoteEndPoint.ToString());
                    show(s.RemoteEndPoint.ToString());//只要有连接就会 show出来继续执行，如果没有 就停在show
                                                      //接收信息
                    Thread th1 = new Thread(Resive);
                    th1.Start(s);
                    th1.IsBackground = true; 
                }
                catch
                { 

                }
            }
        }
        private void Resive(object s1)
        {
            while (true)
            {
                try// 防止出异常 
                {
                    Socket s = (Socket)s1;
                    byte[] buffer = new byte[1024 * 1024 * 2]; //只能传二进制 之后再解码
                    int r = s.Receive(buffer);//把接收的字节放到buffer 里面 并且 返回 字节数  
                    if (r == 0) break;
                    string str = Encoding.UTF8.GetString(buffer, 0, r); // 解码 
                    txtLog.Clear();
                    txtLog.Text=str;
                }
                catch //什么都不用写 出异常只需 不想下执行 ，不用告诉用户
                {
                    
                }
            }
        }
        private void show(string s)
        {
            txtLog.AppendText(s);
        }

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

        private void txtServer_TextChanged(object sender, EventArgs e)
        {

        }

        private void button2_Click(object sender, EventArgs e)
        {
            string str = txtMsg.Text;
            byte[] buffer = Encoding.UTF8.GetBytes(str); 
            string ip = comboBox1.SelectedItem.ToString();
            dictoryso[ip].Send(buffer);// 一个 监听的生成几个 通信的每一个都有一个socket 发信息要用通信的socket
        }
    }
}

namespace WindowsFormsApp2
{

    public partial class Form1 : Form
    {
        Socket socketsend;
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            socketsend = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            IPAddress ip = IPAddress.Parse(textSever.Text);
            IPEndPoint point = new IPEndPoint(ip, int.Parse(textPort.Text));
            socketsend.Connect(point);//如果不能连接 就一直卡在这里
            Showmsg("连接成功");
            Thread th = new Thread(Resive);
            th.Start();
        }
        private void button2_Click(object sender, EventArgs e)//发送消息
        {
            string str = textMsg.Text;
            byte[] buffer = new byte[1024 * 1024];
            buffer = Encoding.UTF8.GetBytes(str);
            socketsend.Send(buffer);
         
        }

        private void textSever_TextChanged(object sender, EventArgs e) 
        {

        }

        private void textPort_TextChanged(object sender, EventArgs e)
        {

        }
        private void Showmsg(string str)
        {
            textMsg.AppendText(str);
        }

        private void Form1_Load(object sender, EventArgs e)
        {
          Control.CheckForIllegalCrossThreadCalls = false;
        }
        private void Resive() //接收消息
        {
            while (true)
            {
                byte[] buffer = new byte[1024 * 1024];
                int r = socketsend.Receive(buffer);//得到后放在 buffer里面
                string str = Encoding.UTF8.GetString(buffer,0,r);//解开buffer里面的码// 不写默认全解码
                textMsg.Text = str;
            }
        }

    }

}