搜索局域网内机算机(机器名、IP。MAC地址)

using  System;
using  System.Collections.Generic;
using  System.ComponentModel;
using  System.Data;
using  System.Drawing;
using  System.Text;
using  System.Windows.Forms;
using  System.Runtime.InteropServices;
using  System.Net;
using  System.Net.Sockets;
using  System.DirectoryServices;



namespace  ipcheck
... {
         //private System.ComponentModel.Container components = null;
    public partial class MainForm : Form
    ...{
        public MainForm()
        ...{
            InitializeComponent();
        }
        [DllImport("Iphlpapi.dll")]
        private static extern int SendARP(Int32 dest, Int32 host, ref Int64 mac, ref Int32 length);
        [DllImport("Ws2_32.dll")]
        private static extern Int32 inet_addr(string ip);
        private string     macAddress,ipAddress;

        private bool canPing = false;
        private string  GetMacAddress() // 得到指定IP的MAC地址 
        ...{
            Int32 ldest = 0;
            try
            ...{
                ldest = inet_addr(ipAddress);
            }
            catch (Exception iperr)
            ...{
                MessageBox.Show(iperr.Message);
            }
            Int64 macinfo = new Int64();
            Int32 len = 6;
            try
            ...{
                int res = SendARP(ldest, 0, ref macinfo, ref len);
            }
            catch (Exception err)
            ...{
                //    throw new Exception("在解析MAC地址过程发生了错误!"); 
                MessageBox.Show(err.Message);
            }
            string originalMACAddress = macinfo.ToString("X4");
            if (originalMACAddress != "0000" && originalMACAddress.Length == 12)
            ...{ //合法MAC地址 
                string mac1, mac2, mac3, mac4, mac5, mac6;
                mac1 = originalMACAddress.Substring(10, 2);
                mac2 = originalMACAddress.Substring(8, 2);
                mac3 = originalMACAddress.Substring(6, 2);
                mac4 = originalMACAddress.Substring(4, 2);
                mac5 = originalMACAddress.Substring(2, 2);
                mac6 = originalMACAddress.Substring(0, 2);
                macAddress = mac1 + "-" + mac2 + "-" + mac3 + "-" + mac4 + "-" + mac5 + "-" + mac6;
                canPing = true;
            }
            else
            ...{
                macAddress = "无法探测到MAC地址";
                canPing = false;
            }
            return macAddress;
        }
        private void tbar_ButtonClick(object sender, ToolBarButtonClickEventArgs e)
        ...{
            switch (e.Button.Name)
            ...{ 
                case "Btn_search":
                    int i = 0;
                    DirectoryEntry root = new DirectoryEntry("WinNT:");
                    DirectoryEntries domains = root.Children;
                    domains.SchemaFilter.Add("domain");
                         foreach (DirectoryEntry  domain in domains)
                         ...{
                             this.g_list.Items.Add(domain.Name.ToString());
                             
                             DirectoryEntries computers = domain.Children;
                             computers.SchemaFilter.Add("computer");
                                foreach (DirectoryEntry computer in computers)
                             ...{
                                 this.Grid_view.Rows.Add();
                                 this.Grid_view.Rows[i].Cells[0].Value = i + 1;
                                 this.Grid_view.Rows[i].Cells[1].Value = computer.Name.ToString();
                                 IPHostEntry iphe = null;
                                 try
                                 ...{
                                     iphe = Dns.GetHostByName(computer.Name.ToString());
                                     this.Grid_view.Rows[i].Cells[2].Value = iphe.AddressList[0].ToString();
                                     ipAddress = iphe.AddressList[0].ToString();
                                     this.Grid_view.Rows[i].Cells[3].Value = GetMacAddress();

                                 }
                                 catch
                                 ...{
                                     continue;
                                 }
                                 this.Grid_view.Rows[i].Cells[4].Value = domain.Name.ToString();
                                 i++;
                             }  
                           
                         }


                    break;
            
            }
        }
    }
}