c# 很久以前写的 HOST 获取工具 速度快一流的

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

namespace WindowsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private static int i1, i2, i3, i4,d1;
     

        private void button1_Click(object sender, EventArgs e)
        {
           try
           {
               this.listView1.Clear();
               this.listView1.Columns.Add("IP", 100, HorizontalAlignment.Left);
               this.listView1.Columns.Add("主机名", 180, HorizontalAlignment.Left);

                i1 = int.Parse(this.textBox1.Text);
                i2 = int.Parse(this.textBox2.Text);
                i3 = int.Parse(this.textBox3.Text);
                i4 = int.Parse(this.textBox4.Text);
            
                d1 = int.Parse(textBox9.Text);

                if (i1 >= 255 || i2 >= 255 || i3 >= 255 || i4 >= 255)
                {
                    MessageBox.Show("你的开始IP 有误");
                    return;
                }
                else
                {

                    this.progressBar1.Maximum = int.Parse(this.textBox9.Text);
                    this.progressBar1.Value = 1;
                    strat();
                }

           }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);

            }

        }

        private void Form1_Load(object sender, EventArgs e)
        {
            this.listView1.Columns.Add("IP", 100, HorizontalAlignment.Left);
            this.listView1.Columns.Add("主机名", 180, HorizontalAlignment.Left);
        }

        private void strat()
        {
            Thread[] thread = new Thread[d1];
            int s = d1 - 1;

            while (true)
            {
               thread[s] = new Thread(new ThreadStart(dowhlies));

               thread[s].Start();
              

               s--;

               if (s == 0)
                   break;

            }

        }

        private string ips()
        {
            lock (this)
            {
                i4++;
                if (i4 == 254)
                {
                    i4 = 1;
                    i3++;
                }
                else if (i3 == 254)
                {
                    i3 = 0;
                    i2++;
                }
                else if (i2 == 254)
                {
                    i2 = 0;
                    i1++;
                }
               
                return i1.ToString() + "." + i2.ToString() + "." + i3.ToString() + "." + i4.ToString();
            }
        }

        private int d = 0;
        private int s = 0;

        private void dowhlies()
        {
         
              string dis=  ips();
              

                string ds = "";
                try
                {
                    IPHostEntry results = Dns.GetHostByAddress(dis);
                    ds = results.HostName;
                    d=d+1;
                    label4.Text = "有" + d.ToString() + "主机获取主机名成功..";
                }
                catch (Exception ex)
                {
                    s = s + 1;
                    
                    ds = ex.Message;
                    label5.Text = "有" + s.ToString() + "主机获取主机名失败..";
                }

                ListViewItem l1 = new ListViewItem();
               // this.listView1.Items.Add(i1.ToString() + "." + i2.ToString() + "." + i3.ToString() + "." + i4.ToString());
                l1.SubItems[0].Text = dis;
                l1.SubItems.Add(ds);
                this.listView1.Items.Add(l1);

                this.listView1.Update();

                this.progressBar1.Value++;
               

            }

        private void button2_Click(object sender, EventArgs e)
        {
            this.listView1.Clear();
            this.d = 0;
            this.s=0;
        }
           

        }

    }
 

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