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各位同志 怎样获得局域网中的ip 呢?

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发表于 2020-1-23 22:20:01 | 显示全部楼层 |阅读模式
谢谢了
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发表于 2020-2-8 20:45:02 | 显示全部楼层
using System;
  using System.Drawing;
  using System.Collections;
  using System.ComponentModel;
  using System.Windows.Forms;
  using System.Data;
  using System.Net;
  using System.Threading;
  
  namespace WindowLanSearch
  {
  ///
  /// Form1 的摘要说明。
  ///
  public class Form1 : System.Windows.Forms.Form
  {
  private System.Windows.Forms.TextBox textBox1;
  private System.Windows.Forms.Button button1;
  private string[,] LanHost;
  private System.Windows.Forms.ProgressBar progressBarSearch;
  private Thread[] thread;
  private System.Windows.Forms.ListView listView1;
  private System.Windows.Forms.ColumnHeader columnHeader1;
  private System.Windows.Forms.ColumnHeader columnHeader2;
  private string str;
  ///
  /// 必需的设计器变量。
  ///
  private System.ComponentModel.Container components = null;
  
  public Form1()
  {
  //
  // Windows 窗体设计器支持所必需的
  //
  InitializeComponent();
  InitLanHost();
  progressBarSearch.Maximum = 255;
  
  //
  // TODO: 在 InitializeComponent 调用后添加任何构造函数代码
  //
  }
  
  ///
  /// 数组初始化
  ///
  private void InitLanHost()
  {
  LanHost = new string[255,2];
  for (int i=0;i<255;i++)
  {
  LanHost[i,0] = "";
  LanHost[i,1] = "";
  }
  }
  
  ///
  /// 清理所有正在使用的资源。
  ///
  protected override void Dispose( bool disposing )
  {
  if( disposing )
  {
  if (components != null)
  {
  components.Dispose();
  }
  }
  base.Dispose( disposing );
  }
  
  #region Windows 窗体设计器生成的代码
  ///
  /// 设计器支持所需的方法 - 不要使用代码编辑器修改
  /// 此方法的内容。
  ///
  private void InitializeComponent()
  {
  this.textBox1 = new System.Windows.Forms.TextBox();
  this.button1 = new System.Windows.Forms.Button();
  this.progressBarSearch = new System.Windows.Forms.ProgressBar();
  this.listView1 = new System.Windows.Forms.ListView();
  this.columnHeader1 = new System.Windows.Forms.ColumnHeader();
  this.columnHeader2 = new System.Windows.Forms.ColumnHeader();
  this.SuspendLayout();
  //
  // textBox1
  //
  this.textBox1.Location = new System.Drawing.Point(24, 40);
  this.textBox1.Multiline = true;
  this.textBox1.Name = "textBox1";
  this.textBox1.ScrollBars = System.Windows.Forms.ScrollBars.Both;
  this.textBox1.Size = new System.Drawing.Size(176, 296);
  this.textBox1.TabIndex = 0;
  this.textBox1.Text = "";
  //
  // button1
  //
  this.button1.Location = new System.Drawing.Point(456, 40);
  this.button1.Name = "button1";
  this.button1.TabIndex = 1;
  this.button1.Text = "开始搜索";
  this.button1.Click += new System.EventHandler(this.button1_Click);
  //
  // progressBarSearch
  //
  this.progressBarSearch.Location = new System.Drawing.Point(32, 360);
  this.progressBarSearch.Name = "progressBarSearch";
  this.progressBarSearch.Size = new System.Drawing.Size(490, 24);
  this.progressBarSearch.TabIndex = 2;
  //
  // listView1
  //
  this.listView1.Columns.AddRange(new System.Windows.Forms.ColumnHeader[] {
  this.columnHeader1,
  this.columnHeader2});
  this.listView1.Location = new System.Drawing.Point(248, 40);
  this.listView1.Name = "listView1";
  this.listView1.Size = new System.Drawing.Size(184, 288);
  this.listView1.TabIndex = 5;
  //
  // columnHeader1
  //
  this.columnHeader1.Text = "dddd";
  //
  // columnHeader2
  //
  this.columnHeader2.Text = "sssss";
  //
  // Form1
  //
  this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
  this.ClientSize = new System.Drawing.Size(544, 413);
  this.Controls.Add(this.listView1);
  this.Controls.Add(this.progressBarSearch);
  this.Controls.Add(this.button1);
  this.Controls.Add(this.textBox1);
  this.Name = "Form1";
  this.Text = "Form1";
  this.ResumeLayout(false);
  
  }
  #endregion
  
  ///
  /// 应用程序的主入口点。
  ///
  [STAThread]
  static void Main()
  {
  Application.Run(new Form1());
  }
  private void button1_Click(object sender, System.EventArgs e)
  {
  
  LanSearch();
  
  }
  ///
  /// 局域网搜索事件
  ///
  private void LanSearch()
  {
  thread = new Thread[255];
  
  ThreadStart threadMethod;
  
  Thread threadProgress = new Thread(new ThreadStart(progressSearch));
  threadProgress.Start();
  
  string localhost = (Dns.GetHostByName(Dns.GetHostName())).AddressList[0].ToString(); //本地主机IP地址
  str = localhost.Substring(0,localhost.LastIndexOf("."));
  
  for (int i=0;i<255;i++) //建立255个线程扫描IP
  {
  threadMethod = new ThreadStart(LanSearchThreadMethod);
  thread[i] = new Thread(threadMethod);
  thread[i].Name = i.ToString();
  thread[i].Start();
  if (!thread[i].Join(100))  //Thread.Join(100)不知道这处这么用对不对,感觉没什么效果一样
  {
  thread[i].Abort();
  }
  }
  
  GetLanHost();
  listLanHost();
  }
  ///
  /// 多线程搜索方法
  ///
  private void LanSearchThreadMethod()
  {
  int Currently_i = Convert.ToUInt16(Thread.CurrentThread.Name); //当前进程名称
  
  IPAddress ScanIP = IPAddress.Parse( str + "."+Convert.ToString(Currently_i +1)); //获得扫描IP地址
  IPHostEntry ScanHost = null;
  ScanHost = Dns.GetHostByAddress(ScanIP);  //获得扫描IP地址主机信息
  
  if (ScanHost != null)
  {
  LanHost[Currently_i,0] = ScanIP.ToString();
  LanHost[Currently_i,1] = ScanHost.HostName;
  }
  
  //progressBarSearch.Value = progressBarSearch.Value +1;
  
  }
  ///
  /// 文本框显示主机名与IP列表
  ///
  private void GetLanHost()
  {
  for (int i=0;i<255;i++)
  if ( LanHost[i,0] !="")
  {
  textBox1.Text =textBox1.Text + LanHost[i,1] +":" +LanHost[i,0] + "\r\n";
  }
  }
  ///
  /// listview1 显示搜索主机
  ///
  private void listLanHost()
  {
  listView1.View = View.List;
  
  ListViewItem aa ;
  for (int i=0;i<255;i++)
  {
  if ( LanHost[i,0] !="")
  {
  aa= new ListViewItem();
  aa.Text = LanHost[i,1];
  aa.Tag = LanHost[i,0];
  listView1.Items.Add(aa);
  }
  }
  
  }
  ///
  /// 进度条处理线程
  ///
  private void progressSearch()
  {
  //label1.Text = "进度条只是时间估计,不是真实搜索进度!";
  progressBarSearch.Value = 0;
  for (int i=0;i<255;i++)
  {
  progressBarSearch.Value = progressBarSearch.Value + 1;
  Thread.Sleep(100);
  }
  }
  }
  }
  
  遗憾之处:因搜索较慢,没有实现真实的搜索进度。
  不懂之处:实现文字提示时,当在鼠标事件首尾插入
  private void button1_Click(object sender, System.EventArgs e)
  {
  lab1.Text = “开始搜索”;   //新插入
  LanSearch();
  lab1.Text = “结束搜索”;   //新插入
  }
  文本提示时,在lab1上始终不能及时显示,而是等所有线程结束后才显示“结束搜索“。
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发表于 2020-2-8 21:15:01 | 显示全部楼层
搜索出来的。
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