怎么在Winform中获取客户端的MAC地址

using System;using System.Collections;using System.ComponentModel;using System.Data;using System.Drawing;using System.Text;using System.Windows.Forms;using System.Net;using System.Net.Sockets;using System.Threading;using System.DirectoryServices;namespace CSDNResult...{    /**//// <summary>    /// Form1 的摘要说明。    /// </summary>    public class Form1 : System.Windows.Forms.Form    ...{        private System.Windows.Forms.Button button1;        private System.Windows.Forms.TreeView PCTree;        private System.Windows.Forms.ListBox listBox1;        /**//// <summary>        /// 必需的设计器变量。        /// </summary>        private System.ComponentModel.Container components = null;        public Form1()        ...{            //            // Windows 窗体设计器支持所必需的            //            InitializeComponent();            //            // TODO: 在 InitializeComponent 调用后添加任何构造函数代码            //        }        /**//// <summary>        /// 清理所有正在使用的资源。        /// </summary>        protected override void Dispose( bool disposing )        ...{            if( disposing )            ...{                if (components != null)                 ...{                    components.Dispose();                }            }            base.Dispose( disposing );        }        Windows 窗体设计器生成的代码#region Windows 窗体设计器生成的代码        /**//// <summary>        /// 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。        /// </summary>        private void InitializeComponent()        ...{            this.button1 = new System.Windows.Forms.Button();            this.PCTree = new System.Windows.Forms.TreeView();            this.listBox1 = new System.Windows.Forms.ListBox();            this.SuspendLayout();            //             // button1            //             this.button1.Location = new System.Drawing.Point(440, 152);            this.button1.Name = "button1";            this.button1.TabIndex = 0;            this.button1.Text = "button1";            this.button1.Click += new System.EventHandler(this.button1_Click);            //             // PCTree            //             this.PCTree.ImageIndex = -1;            this.PCTree.Location = new System.Drawing.Point(40, 56);            this.PCTree.Name = "PCTree";            this.PCTree.SelectedImageIndex = -1;            this.PCTree.Size = new System.Drawing.Size(280, 288);            this.PCTree.TabIndex = 1;            //             // listBox1            //             this.listBox1.ItemHeight = 12;            this.listBox1.Location = new System.Drawing.Point(368, 192);            this.listBox1.Name = "listBox1";            this.listBox1.Size = new System.Drawing.Size(264, 172);            this.listBox1.TabIndex = 2;            //             // Form1            //             this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);            this.ClientSize = new System.Drawing.Size(648, 414);            this.Controls.Add(this.listBox1);            this.Controls.Add(this.PCTree);            this.Controls.Add(this.button1);            this.Name = "Form1";            this.Text = "Form1";            this.Load += new System.EventHandler(this.Form1_Load);            this.ResumeLayout(false);        }        #endregion        /**//// <summary>        /// 应用程序的主入口点。        /// </summary>        [STAThread]        static void Main()         ...{            Application.Run(new Form1());        }        private void Form1_Load(object sender, System.EventArgs e)        ...{                }        private void button1_Click(object sender, System.EventArgs e)        ...{            GetIPAddress();        }        public static string ReadMac(string ip)//传递IP地址,即可返回MAC地址        ...{            string mac = "";            System.Diagnostics.Process p = new System.Diagnostics.Process();            p.StartInfo.FileName = "nbtstat";            p.StartInfo.Arguments = "-a " + ip;            p.StartInfo.UseShellExecute = false;            p.StartInfo.CreateNoWindow = true;            p.StartInfo.RedirectStandardOutput = true;                        p.Start();            string output = p.StandardOutput.ReadToEnd();            int len = output.IndexOf("MAC Address = ");            if(len>0)            ...{                mac = output.Substring(len + 14, 17);            }                        p.WaitForExit();                        return mac;        }        public void GetIPAddress()        ...{            DirectoryEntry entryPC = new DirectoryEntry("WinNT:");            ArrayList arr=new ArrayList();            foreach(DirectoryEntry child in entryPC.Children)            ...{                TreeNode node = new TreeNode();                node.Text = child.SchemaClassName+":"+child.Name;                PCTree.Nodes.Add(node);                foreach(DirectoryEntry pc in child.Children)                ...{                    if(String.Compare(pc.SchemaClassName,"computer",true)==0)                    ...{                        TreeNode son = new TreeNode();                        //son.Text = pc.Name;                        try                        ...{                            IPHostEntry hostent = Dns.GetHostByName(pc.Name); // 主机信息                            Array addrs = hostent.AddressList;            // IP地址数组                            IEnumerator it = addrs.GetEnumerator();       // 迭代器                            while(it.MoveNext())                             ...{                     // 循环到下一个IP 地址                                IPAddress ip = (IPAddress)it.Current;      // 获得 IP 地址                                son.Text=ip.ToString(); // 显示 IP地址                                arr.Add(ReadMac(ip.ToString()));                            }                        }                        catch                        ...{                            son.Text=pc.Name;                        }                        node.Nodes.Add(son);                    }                }            }            foreach(string s in arr)            ...{                this.listBox1.Items.Add(s);            }        }            }}