C # Control Network Relay Code Example

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.Tasks;
using System.Windows.Forms;

namespace WinFormsApp1
{
    public partial class Form1 : Form
    {
        public static Socket ClientSocket;
        public static string IP = "192.168.0.200";
        public static int port = 8899;
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            
        }

        private void SocketSendMessage(string CMD)
        {
            IPAddress ip = IPAddress.Parse(IP);  //将IP地址字符串转换成IPAddress实例
            ClientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);//使用指定的地址簇协议、套接字类型和通信协议
            IPEndPoint endPoint = new IPEndPoint(ip, port); // 用指定的ip和端口号初始化IPEndPoint实例
            ClientSocket.Connect(endPoint);  //与远程主机建立连接

            byte[] message = HexStrTobyte(CMD);
            ClientSocket.Send(message);
            byte[] receive = new byte[message.Length];
            int length = ClientSocket.Receive(receive);  // length 接收字节数组长度
            richTextBox1.Text = DateTime.Now.ToString("HH:mm:ss") + ":" + byteToHexStr(receive)+"n" + richTextBox1.Text;
            ClientSocket.Close();  //关闭连接
        }

        private static byte[] HexStrTobyte(string hexString)
        {
            hexString = hexString.Replace(" ", "");
            if ((hexString.Length % 2) != 0)
                hexString += " ";
            byte[] returnBytes = new byte[hexString.Length / 2];
            for (int i = 0; i < returnBytes.Length; i++)
                returnBytes[i] = Convert.ToByte(hexString.Substring(i * 2, 2).Trim(), 16);
            return returnBytes;
        }

        // 字节数组转16进制字符串   
        public static string byteToHexStr(byte[] bytes)
        {
            string returnStr = "";
            if (bytes != null)
            {
                for (int i = 0; i < bytes.Length; i++)
                {
                    returnStr = returnStr+" "+ bytes[i].ToString("X2");//ToString("X2") 为C#中的字符串格式控制符
                }
            }
            return returnStr;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            SocketSendMessage("01 06 00 00 00 01 48 0A");
        }

        private void button2_Click(object sender, EventArgs e)
        {
            SocketSendMessage("01 06 00 00 00 00 89 CA");
        }

        private void button4_Click(object sender, EventArgs e)
        {
            SocketSendMessage("01 06 00 01 00 01 19 CA");
        }

        private void button3_Click(object sender, EventArgs e)
        {
            SocketSendMessage("01 06 00 01 00 00 D8 0A");
        }

        private void button6_Click(object sender, EventArgs e)
        {
            SocketSendMessage("01 06 00 02 00 01 E9 CA");
        }

        private void button5_Click(object sender, EventArgs e)
        {
            SocketSendMessage("01 06 00 02 00 00 28 0A");
        }

        private void button8_Click(object sender, EventArgs e)
        {
            SocketSendMessage("01 06 00 03 00 01 B8 0A");
        }

        private void button7_Click(object sender, EventArgs e)
        {
            SocketSendMessage("01 06 00 03 00 00 79 CA");
        }

        private void button9_Click(object sender, EventArgs e)
        {
        }

        private void button10_Click(object sender, EventArgs e)
        {

        }

        private void button9_Click_1(object sender, EventArgs e)
        {
            richTextBox1.Text = "";
        }
    }
}