TCP编程——端口扫描器和网游客户端

简单的端口扫描程序

单线程方式

窗口设计
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.Threading;

namespace WindowsFormsApp3
{
   
   
    public partial class Form1 : Form
    {
   
   
        
        private string hostAddress;
        
        private int start;
        
        private int end;
       
        private int port;
       
       
        public Form1()
        {
   
   
            InitializeComponent();
        }

        private void label5_Click(object sender, EventArgs e)
        {
   
   

        }

        private void button1_Click(object sender, EventArgs e)
        {
   
   
            try
            {
   
   
                
                textBox4.Clear();
                label5.Text = "0%";
               
                hostAddress = textBox1.Text;
                start = Int32.Parse(textBox2.Text);
                end = Int32.Parse(textBox3.Text);
                if (decideAddress())
                {
   
   
                    
                    textBox1.ReadOnly = true;
                    textBox2.ReadOnly = true;
                    textBox3.ReadOnly = true;
                   
                    progressBar1.Minimum = start;
                    progressBar1.Maximum = end;
                   
                    textBox4.AppendText("端口扫描器 v1.0.0" + Environment.NewLine + Environment.NewLine);
                   
                    PortScan();
                }
                else
                {
   
   
                   
                    MessageBox.Show("输入错误，端口范围为[0-65536]!");
                }
            }
            catch
            {
   
   
                
                MessageBox.Show("输入错误，端口范围为[0-65536]!");
            }
        }

        private bool decideAddress()
        {
   
   
            
            if ((start >= 0 && start <= 65536) &&