本文所述为基于C#实现的端口扫描器代码，代码内包括了窗体和逻辑处理两部分代码。在代码中，创建TcpClient对象，把TcpClient用于为TCP网络服务提供客户端连接，创建线程，并创建ThreadStart委托对象，端口扫描范围为[0-65536]，也可自定义扫描范围。

功能主要代码如下：

using System; using System.Drawing; using System.Windows.Forms; using System.Net.Sockets; using System.Threading; namespace PortScanner { public class Form1: System.Windows.Forms.Form { private System.Windows.Forms.TextBox txtAddr; private System.Windows.Forms.TextBox txtStart; private System.Windows.Forms.TextBox txtEnd; private System.Windows.Forms.Label label1; private System.Windows.Forms.Label label2; private System.Windows.Forms.Label label3; private System.Windows.Forms.Splitter splitter1; private System.Windows.Forms.ListBox lbResult; private System.Windows.Forms.Button btnScan; private System.Windows.Forms.ProgressBar progressBar1; private System.Windows.Forms.Label lblStart; private System.Windows.Forms.Label lblStop; private System.Windows.Forms.Label lblNow; //自定义变量 private int port; private string Addr; private bool[] done = new bool[65536]; private int start; private int end; private Thread scanThread; private bool OK; public Form1() { InitializeComponent(); } private void InitializeComponent() { this.lbResult = new System.Windows.Forms.ListBox(); this.txtAddr = new System.Windows.Forms.TextBox(); this.txtStart = new System.Windows.Forms.TextBox(); this.txtEnd = new System.Windows.Forms.TextBox(); this.label1 = new System.Windows.Forms.Label(); this.label2 = new System.Windows.Forms.Label(); this.label3 = new System.Windows.Forms.Label(); this.splitter1 = new System.Windows.Forms.Splitter(); this.btnScan = new System.Windows.Forms.Button(); this.progressBar1 = new System.Windows.Forms.ProgressBar(); this.lblStart = new System.Windows.Forms.Label(); this.lblStop = new System.Windows.Forms.Label(); this.lblNow = new System.Windows.Forms.Label(); this.SuspendLayout(); // // lbResult // this.lbResult.Dock = System.Windows.Forms.DockStyle.Right; this.lbResult.Font = new System.Drawing.Font("Tahoma", 9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0))); this.lbResult.ItemHeight = 14; this.lbResult.Location = new System.Drawing.Point(224, 0); this.lbResult.Name = "lbResult"; this.lbResult.Size = new System.Drawing.Size(264, 270); this.lbResult.TabIndex = 0; // // txtAddr // this.txtAddr.Font = new System.Drawing.Font("Tahoma", 9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0))); this.txtAddr.Location = new System.Drawing.Point(72, 16); this.txtAddr.Name = "txtAddr"; this.txtAddr.Size = new System.Drawing.Size(136, 22); this.txtAddr.TabIndex = 1; this.txtAddr.Text = ""; // // txtStart // this.txtStart.Font = new System.Drawing.Font("Tahoma", 9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0))); this.txtStart.Location = new System.Drawing.Point(72, 48); this.txtStart.Name = "txtStart"; this.txtStart.Size = new System.Drawing.Size(136, 22); this.txtStart.TabIndex = 2; this.txtStart.Text = ""; this.txtStart.TextChanged += new System.EventHandler(this.txtStart_TextChanged); // // txtEnd // this.txtEnd.Font = new System.Drawing.Font("Tahoma", 9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0))); this.txtEnd.Location = new System.Drawing.Point(72, 80); this.txtEnd.Name = "txtEnd"; this.txtEnd.Size = new System.Drawing.Size(136, 22); this.txtEnd.TabIndex = 3; this.txtEnd.Text = ""; this.txtEnd.TextChanged += new System.EventHandler(this.txtEnd_TextChanged); // // label1 // this.label1.Font = new System.Drawing.Font("Tahoma", 9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0))); this.label1.Location = new System.Drawing.Point(8, 16); this.label1.Name = "label1"; this.label1.Size = new System.Drawing.Size(64, 23); this.label1.TabIndex = 4; this.label1.Text = "主机地址"; // // label2 // this.label2.Font = new System.Drawing.Font("Tahoma", 9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0))); this.label2.Location = new System.Drawing.Point(8, 80); this.label2.Name = "label2"; this.label2.Size = new System.Drawing.Size(64, 23); this.label2.TabIndex = 5; this.label2.Text = "结束端口"; // // label3 // this.label3.Font = new System.Drawing.Font("Tahoma", 9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0))); this.label3.Location = new System.Drawing.Point(8, 48); this.label3.Name = "label3"; this.label3.Size = new System.Drawing.Size(64, 23); this.label3.TabIndex = 6; this.label3.Text = "起始端口"; // // splitter1 // this.splitter1.Dock = System.Windows.Forms.DockStyle.Right; this.splitter1.Location = new System.Drawing.Point(221, 0); this.splitter1.Name = "splitter1"; this.splitter1.RightToLeft = System.Windows.Forms.RightToLeft.Yes; this.splitter1.Size = new System.Drawing.Size(3, 273); this.splitter1.TabIndex = 7; this.splitter1.TabStop = false; // // btnScan // this.btnScan.Font = new System.Drawing.Font("Tahoma", 9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0))); this.btnScan.Location = new System.Drawing.Point(72, 200); this.btnScan.Name = "btnScan"; this.btnScan.TabIndex = 8; this.btnScan.Text = "扫描"; this.btnScan.Click += new System.EventHandler(this.btnScan_Click); // // progressBar1 // this.progressBar1.Location = new System.Drawing.Point(8, 112); this.progressBar1.Name = "progressBar1"; this.progressBar1.Size = new System.Drawing.Size(200, 23); this.progressBar1.Step = 1; this.progressBar1.TabIndex = 9; // // lblStart // this.lblStart.Font = new System.Drawing.Font("Tahoma", 9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0))); this.lblStart.Location = new System.Drawing.Point(8, 144); this.lblStart.Name = "lblStart"; this.lblStart.Size = new System.Drawing.Size(48, 23); this.lblStart.TabIndex = 10; // // lblStop // this.lblStop.Font = new System.Drawing.Font("Tahoma", 9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0))); this.lblStop.Location = new System.Drawing.Point(160, 144); this.lblStop.Name = "lblStop"; this.lblStop.Size = new System.Drawing.Size(48, 23); this.lblStop.TabIndex = 11; // // lblNow // this.lblNow.Font = new System.Drawing.Font("Tahoma", 9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0))); this.lblNow.Location = new System.Drawing.Point(84, 144); this.lblNow.Name = "lblNow"; this.lblNow.Size = new System.Drawing.Size(48, 23); this.lblNow.TabIndex = 12; this.AutoScaleBaseSize = new System.Drawing.Size(6, 15); this.ClientSize = new System.Drawing.Size(488, 273); this.Controls.Add(this.lblNow); this.Controls.Add(this.lblStop); this.Controls.Add(this.lblStart); this.Controls.Add(this.progressBar1); this.Controls.Add(this.btnScan); this.Controls.Add(this.splitter1); this.Controls.Add(this.label3); this.Controls.Add(this.label2); this.Controls.Add(this.label1); this.Controls.Add(this.txtEnd); this.Controls.Add(this.txtStart); this.Controls.Add(this.txtAddr); this.Controls.Add(this.lbResult); this.Font = new System.Drawing.Font("Tahoma", 9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0))); this.Name = "Form1"; this.Text = "端口扫描器"; this.ResumeLayout(false); } [STAThread] static void Main() { Application.Run(new Form1()); } private void btnScan_Click(object sender, System.EventArgs e) { //创建线程，并创建ThreadStart委托对象 Thread process = new Thread(new ThreadStart(PortScan)); process.Start(); //显示端口扫描的范围 progressBar1.Minimum = Int32.Parse(txtStart.Text); progressBar1.Maximum = Int32.Parse(txtEnd.Text); //显示框初始化 lbResult.Items.Clear(); lbResult.Items.Add("端口扫描器 v1.0."); lbResult.Items.Add(""); } private void PortScan() { start = Int32.Parse(txtStart.Text); end = Int32.Parse(txtEnd.Text); //检查输入范围合法性 if ((start >= 0 && start <= 65536) && (end >= 0 && end <= 65536) && (start <= end)) { lbResult.Items.Add("开始扫描... (可能需要请您等待几分钟)"); Addr = txtAddr.Text; for (int i = start; i <= end; i++) { port = i; //使用该端口的扫描线程 scanThread = new Thread(new ThreadStart(Scan)); scanThread.Start(); //使线程睡眠 System.Threading.Thread.Sleep(100); progressBar1.Value = i; lblNow.Text = i.ToString(); } //未完成时情况 while (!OK) { OK = true; for (int i = start; i <= end; i++) { if (!done[i]) { OK = false; break; } } System.Threading.Thread.Sleep(1000); } lbResult.Items.Add("扫描结束!"); } else { MessageBox.Show("输入错误，端口范围为[0-65536]"); } } private void Scan() { int portnow = port; //创建线程变量 Thread Threadnow = scanThread; done[portnow] = true; //创建TcpClient对象，TcpClient用于为TCP网络服务提供客户端连接 TcpClient objTCP = null; //扫描端口，成功则写入信息 try { //用TcpClient对象扫描端口 objTCP = new TcpClient(Addr, portnow); lbResult.Items.Add("端口 " + portnow.ToString() + " 开放!"); } catch { } } private void txtStart_TextChanged(object sender, System.EventArgs e) { //获取输入的起始端口值 lblStart.Text = txtStart.Text; } private void txtEnd_TextChanged(object sender, System.EventArgs e) { //获取输入的接受端口值 lblStop.Text = txtEnd.Text; } } }