基於C#實現端口掃描器(單線程和多線程)

一、新建項目並設置界面

新建項目:

選擇Windows窗體項目應用(.Net Framework):

設置項目名和路徑:

新建項目如下:

設置界面:

將tbShow設置為隻讀:

二、單線程實現端口掃描

1. 編寫代碼

雙擊按鈕,編寫其點擊事件:

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

namespace Scan
{
    public partial class Form1 : Form
    {


        //主機地址
        private string hostAddress;
        //起始端口
        private int start;
        //終止端口
        private int end;
        //端口號
        private int port;
        //定義線程對象
        private Thread scanThread;
        

        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click_1(object sender, EventArgs e)
        {
            try
            {
                //初始化
                tbShow.Clear();
                lb.Text = "0%";

                //獲取ip地址和始末端口號
                hostAddress = tbHost.Text;
                start = Int32.Parse(tbSPort.Text);
                end = Int32.Parse(tbEPort.Text);

                if (decideAddress()) // 端口合理
                {
                    //讓輸入的textbox隻讀,無法改變
                    tbHost.ReadOnly = true;
                    tbSPort.ReadOnly = true;
                    tbEPort.ReadOnly = true;
                    //設置進度條的范圍
                    pb.Minimum = start;
                    pb.Maximum = end;

                    //顯示框顯示
                    tbShow.AppendText("端口掃描器 v1.0.0" + Environment.NewLine + Environment.NewLine);
                    //調用端口掃描函數
                    PortScan();
                }
                else
                {
                	//若端口號不合理,彈窗報錯
                    MessageBox.Show("輸入錯誤,端口范圍為[0-65536]!");
                }
            }
            catch
            {
				//若輸入的端口號為非整型,則彈窗報錯
                MessageBox.Show("輸入錯誤,端口范圍為[0-65536]!");
            }
        }

        /// <summary>
        /// 判斷端口是否合理
        /// </summary>
        /// <returns></returns>
        private bool decideAddress()
        {
            //判斷端口號是否合理
            if ((start >= 0 && start <= 65536) && (end >= 0 && end <= 65536) && (start <= end))
                return true;
            else
                return false;
        }


        private void PortScan()
        {
            double x;
            string xian;
            //顯示掃描狀態
            tbShow.AppendText("開始掃描...(可能需要請您等待幾分鐘)" + Environment.NewLine + Environment.NewLine);
            //循環拋出線程掃描端口
            for (int i = start; i <= end; i++)
            {
                x = (double)(i - start + 1) / (end - start + 1);
                xian = x.ToString("0%");
                port = i;
                //調用端口i的掃描操作
                Scan();
                //進度條值改變
                lb.Text = xian;
                lb.Refresh();
                pb.Value = i;
            }
            tbShow.AppendText(Environment.NewLine + "掃描結束!" + Environment.NewLine);
            //輸入框textbox隻讀屬性取消
            tbHost.ReadOnly = false;
            tbSPort.ReadOnly = false;
            tbEPort.ReadOnly = false;
        }

        /// <summary>
        /// 掃描某個端口
        /// </summary>
        private void Scan()
        {
            int portnow = port;
            //創建TcpClient對象,TcpClient用於為TCP網絡服務提供客戶端連接
            TcpClient objTCP = null;
            try
            {
                //用於TcpClient對象掃描端口
                objTCP = new TcpClient(hostAddress, portnow);
                //掃描到則顯示到顯示框
                tbShow.AppendText("端口 " + port + " 開放!" + Environment.NewLine);
            }
            catch
            {
                //未掃描到,則會拋出錯誤
            }
        }


    }
}

2. 運行結果

可發現速度十分緩慢,且不能拖拽。

三、多線程實現端口掃描

1. 編寫代碼

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

namespace Scan
{
    public partial class Form1 : Form
    {


        //主機地址
        private string hostAddress;
        //起始端口
        private int start;
        //終止端口
        private int end;
        //端口號
        private int port;
        //定義線程對象
        private Thread scanThread;
        //定義端口狀態數據(開放則為true,否則為false)
        private bool[] done = new bool[65526];
        private bool OK;


        public Form1()
        {
            InitializeComponent();
            //不進行跨線程檢查
            CheckForIllegalCrossThreadCalls = false;
        }

        private void button1_Click_1(object sender, EventArgs e)
        {
            try
            {
                //初始化
                tbShow.Clear();
                lb.Text = "0%";

                //獲取ip地址和始末端口號
                hostAddress = tbHost.Text;
                start = Int32.Parse(tbSPort.Text);
                end = Int32.Parse(tbEPort.Text);

                if (decideAddress()) // 端口合理
                {
                    //讓輸入的textbox隻讀,無法改變
                    tbHost.ReadOnly = true;
                    tbSPort.ReadOnly = true;
                    tbEPort.ReadOnly = true;
                    //創建線程,並創建ThreadStart委托對象
                    Thread process = new Thread(new ThreadStart(PortScan));
                    process.Start();
                    //設置進度條的范圍
                    pb.Minimum = start;
                    pb.Maximum = end;

                    //顯示框顯示
                    tbShow.AppendText("端口掃描器 v1.0.0" + Environment.NewLine + Environment.NewLine);
                }
                else
                {
                    //若端口號不合理,彈窗報錯
                    MessageBox.Show("輸入錯誤,端口范圍為[0-65536]!");
                }

            }
            catch
            {
                //若輸入的端口號為非整型,則彈窗報錯
                MessageBox.Show("輸入錯誤,端口范圍為[0-65536]!");
            }
        }

        /// <summary>
        /// 判斷端口是否合理
        /// </summary>
        /// <returns></returns>
        private bool decideAddress()
        {
            //判斷端口號是否合理
            if ((start >= 0 && start <= 65536) && (end >= 0 && end <= 65536) && (start <= end))
                return true;
            else
                return false;
        }


        private void PortScan()
        {
            double x;
            string xian;
            //顯示掃描狀態
            tbShow.AppendText("開始掃描...(可能需要請您等待幾分鐘)" + Environment.NewLine + Environment.NewLine);
            //循環拋出線程掃描端口
            for (int i = start; i <= end; i++)
            {
                x = (double)(i - start + 1) / (end - start + 1);
                xian = x.ToString("0%");
                port = i;
                //使用該端口的掃描線程
                scanThread = new Thread(new ThreadStart(Scan));
                scanThread.Start();
                //使線程睡眠
                System.Threading.Thread.Sleep(100);
                //進度條值改變
                lb.Text = xian;
                pb.Value = i;
            }
            while (!OK)
            {
                OK = true;
                for (int i = start; i <= end; i++)
                {
                    if (!done[i])
                    {
                        OK = false;
                        break;
                    }
                }
                System.Threading.Thread.Sleep(1000);
            }
            tbShow.AppendText(Environment.NewLine + "掃描結束!" + Environment.NewLine);
            //輸入框textbox隻讀屬性取消
            tbHost.ReadOnly = false;
            tbSPort.ReadOnly = false;
            tbEPort.ReadOnly = false;
        }

        /// <summary>
        /// 掃描某個端口
        /// </summary>
        private void Scan()
        {
            int portnow = port;
            //創建線程變量
            Thread Threadnow = scanThread;
            //掃描端口,成功則寫入信息
            done[portnow] = true;
            //創建TcpClient對象,TcpClient用於為TCP網絡服務提供客戶端連接
            TcpClient objTCP = null;
            try
            {
                //用於TcpClient對象掃描端口
                objTCP = new TcpClient(hostAddress, portnow);
                //掃描到則顯示到顯示框
                tbShow.AppendText("端口 " + port + " 開放!" + Environment.NewLine);
            }
            catch
            {
                //未掃描到,則會拋出錯誤
            }
        }


    }
}

2. 運行結果

可發現速度明顯變快,且能拖拽窗口。

四、總結

多線程可以提高CPU的利用率。

以上就是基於C#實現端口掃描器(單線程和多線程)的詳細內容,更多關於C# 端口掃描器的資料請關註WalkonNet其它相關文章!

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