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   源码介绍

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using Tamir.IPLib;
using Tamir.IPLib.Packets;

namespace PcapExceptionTest
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            /* Retrieve the device list */
            PcapDeviceList devices = SharpPcap.GetAllDevices();

            /*If no device exists, print error */
            if (devices.Count < 1)
            {
                MessageBox.Show("No device found on this machine");
                return;
            }
            PcapDevice device = devices[0];
            //Open the device for capturing
            //true -- means promiscuous mode
            //1000 -- means a read wait of 1000ms
            device.PcapOpen(true, 1000);
            //tcpdump filter to capture only TCP/IP packets			
            //string filter = "host or net 127.0.0.1 and tcp and port 80and len> 50";
            string filter = textBox1.Text;
            //Associate the filter with this capture
            try
            {
                device.PcapSetFilter(filter);
            }
            catch (PcapException ex)
            {

                textBox2.Text = ex.Message;
                return;
            }
            finally
            {
                device.PcapClose();
            }
            textBox2.Text = "Success";
        }
    }
}