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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 System.Runtime.InteropServices;

namespace Ex13_03
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click_1(object sender, EventArgs e)
        {
            Dog dog = new Dog(100);
            dog.DogAddr = 0;			// The address wrote
            dog.DogBytes = 10;			// The number of bytes wrote

            string str = textBox1.Text;
            for (int i = 0; i < str.Length; i  )
            {
                dog.DogData[i] = (byte)str[i];
            }
            dog.WriteDog();
            MessageBox.Show("密码已成功写入加密狗！", "成功提示！", MessageBoxButtons.OK, MessageBoxIcon.Information);
            textBox1.ReadOnly = true;
            button1.Enabled = false;
            button2.Enabled = true;
        }

        private void button2_Click_1(object sender, EventArgs e)
        {
            Dog dog = new Dog(100);
            dog.DogAddr = 0;			// The address wrote
            dog.DogBytes = 10;			// The number of bytes wrote
            dog.ReadDog();
            if (dog.Retcode == 0)
            {
                char[] chTemp = new char[textBox1.Text.Length];
                for (int i = 0; i < textBox1.Text.Length; i  )
                {
                    chTemp[i] = (char)dog.DogData[i];
                }

                String str = new String(chTemp);
                textBox2.Text = str;
            }
            else
            {
                textBox2.Text = "2:"   dog.Retcode;
            }
            textBox1.ReadOnly = false;
            button2.Enabled = false;
            button1.Enabled = true;
        }
    }
}
[StructLayout(LayoutKind.Sequential)]
//这个类用于读写加密狗。
public unsafe class Dog
{

    public uint DogBytes, DogAddr;  //设置加密狗起始地址
    public byte[] DogData;  //设置数据的长度
    public uint Retcode;

    [DllImport("Win32dll.dll", CharSet = CharSet.Ansi)]
    public static unsafe extern uint DogRead(uint idogBytes, uint idogAddr, byte* pdogData);
    [DllImport("Win32dll.dll", CharSet = CharSet.Ansi)]
    public static unsafe extern uint DogWrite(uint idogBytes, uint idogAddr, byte* pdogData);

    public unsafe Dog(ushort num)
    {
        DogBytes = num;
        DogData = new byte[DogBytes]; //设置数据的长度
    }

    public unsafe void ReadDog()
    {
        fixed (byte* pDogData = &DogData[0])
        {
            Retcode = DogRead(DogBytes, DogAddr, pDogData);　　//将数据读出加密狗
        }
    }
    public unsafe void WriteDog()
    {
        fixed (byte* pDogData = &DogData[0])
        {
            Retcode = DogWrite(DogBytes, DogAddr, pDogData);　//将数据写入加密狗
        }
    }
}