OllyDBG 入门系列（四）－内存断点 的 注册机 代码

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices; 

namespace RegisterMachine
{
    public partial class Form1 : Form
    {
        [DllImport("KERNEL32.DLL")]
        public static extern int GetDriveType(string lpRootPathName);

        [DllImport("KERNEL32.DLL", CharSet = CharSet.Auto)]
        public static extern bool GetVolumeInformation(
  string lpRootPathName,
  string lpVolumeNameBuffer,
  int nVolumeNameSize,
  int lpVolumeSerialNumber,
  int lpMaximumComponentLength,
  int lpFileSystemFlags,
  string lpFileSystemNameBuffer,
  int nFileSystemNameSize
);

        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            int diskType = GetDriveType(null);
            string vName = new string(' ',20);

            

            bool b = GetVolumeInformation(null, vName, 20, 0, 0, 0, null, 0);

            byte[] buffer = System.Text.Encoding.Default.GetBytes(vName);
            int invCount = 0;
            string hexStr = string.Empty;
            foreach (byte b1 in buffer)
            {
                if (b1 != 0)
                {
                    hexStr = b1.ToString("X") + hexStr;
                    invCount++;
                }
                else
                {
                    break;
                }
            }



            long resValue = unchecked(Convert.ToInt32(hexStr,16) * (diskType * (diskType + 1) / 2));
            long lStr = resValue ^ 0x797A7553;

            textBox1.Text = lStr.ToString();

            //------------数组反转------------
            //int count = buffer.Length;
            //byte tempB;
            //while (count > buffer.Length / 2)
            //{
            //    tempB = buffer[buffer.Length - count];
            //    buffer[buffer.Length - count] = buffer[count - 1];
            //    buffer[count - 1] = tempB;
            //    count--;
            //}

        }
    }
}