读写分区（按扇区）代码,CSharp代码库,德仔网

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【CSharp】读写分区（按扇区）

作者:zgke / 发布于2014/7/29/ 394


	使用方式

	Zgke.DriverLoader T = new Zgke.DriverLoader("C:");

	 byte[] Temp = T.ReadSector(0);

	MessageBox.Show(T.GetString(Temp));

	

	using System;
	using System.Collections.Generic;
	using System.Text;
	using System.Runtime.InteropServices;
	using Microsoft.Win32.SafeHandles;
	using System.Windows.Forms;

	namespace Zgke
	{
	 /// <summary>
	 /// zgke@sina.com
	 /// 2008-09-26
	 /// 磁盘扇区
	 /// </summary>
	 public class DriverLoader
	 {
	 private const uint GENERIC_READ = 0x80000000;
	 private const uint GENERIC_WRITE = 0x40000000;

	 private const uint FILE_SHARE_READ = 0x00000001;
	 private const uint FILE_SHARE_WRITE = 0x00000002;

	 private const uint OPEN_EXISTING = 3;

	 [DllImport("kernel32.dll", SetLastError = true)]
	 private static extern SafeFileHandle CreateFileA(string lpFileName, uint dwDesiredAccess, uint dwShareMode, IntPtr lpSecurityAttributes, uint dwCreationDisposition, uint dwFlagsAndAttributes, IntPtr hTemplateFile);
	
	
	 private System.IO.FileStream _DirverStream;
	 private long _SectorLength = 0;
	 private SafeFileHandle _DirverHandle;

	 /// <summary>
	 /// 扇区数
	 /// </summary>
	 public long SectorLength { get { return _SectorLength; } }

	 /// <summary>
	 /// 获取磁盘扇区信息
	 /// </summary>
	 /// <param name="DirverName">G:</param>
	 public DriverLoader(string DirverName)
	 {
	 if (DirverName == null && DirverName.Trim().Length == 0) return;
	 _DirverHandle = CreateFileA("////.//" + DirverName.Trim(), GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE, IntPtr.Zero, OPEN_EXISTING, 0, IntPtr.Zero);

	 _DirverStream = new System.IO.FileStream(_DirverHandle, System.IO.FileAccess.ReadWrite);

	 GetSectorCount();
	 }

	
	 /// <summary>
	 /// 扇区显示转换
	 /// </summary>
	 /// <param name="SectorBytes">扇区 长度512</param>
	 /// <returns>EB 52 90 ......55 AA</returns>
	 public string GetString(byte[] SectorBytes)
	 {
	 if (SectorBytes.Length != 512) return "";
	 StringBuilder ReturnText = new StringBuilder();

	 int RowCount = 0;
	 for (int i = 0; i != 512; i++)
	 {
	 ReturnText.Append(SectorBytes[i].ToString("X02") + " ");

	 if (RowCount == 15)
	 {
	 ReturnText.Append("/r/n");
	 RowCount = -1;
	 }

	 RowCount++;
	 }

	 return ReturnText.ToString();

	 }
	 /// <summary>
	 /// 获取扇区数
	 /// </summary>
	 private void GetSectorCount()
	 {
	 if (_DirverStream == null) return;
	 _DirverStream.Position = 0;

	 byte[] ReturnByte = new byte[512];
	 _DirverStream.Read(ReturnByte, 0, 512); //获取第1扇区
	
	 if (ReturnByte[0] == 0xEB && ReturnByte[1] == 0x58) //DOS的好象都是32位
	 {
	 _SectorLength = (long)BitConverter.ToInt32(new byte[] { ReturnByte[32], ReturnByte[33], ReturnByte[34], ReturnByte[35] }, 0);
	 }
	 if (ReturnByte[0] == 0xEB && ReturnByte[1] == 0x52) //NTFS好象是64位
	 {
	 _SectorLength = BitConverter.ToInt64(new byte[] { ReturnByte[40], ReturnByte[41], ReturnByte[42], ReturnByte[43], ReturnByte[44], ReturnByte[45], ReturnByte[46], ReturnByte[47] }, 0);
	 }

	 }

	
	 /// <summary>
	 /// 读一个扇区
	 /// </summary>
	 /// <param name="SectorIndex">扇区号</param>
	 /// <returns>如果扇区数字大于分区信息的扇区数 返回NULL</returns>
	 public byte[] ReadSector(long SectorIndex)
	 {
	 if (SectorIndex > _SectorLength) return null;
	 _DirverStream.Position = SectorIndex * 512;
	 byte[] ReturnByte = new byte[512];
	 _DirverStream.Read(ReturnByte, 0, 512); //获取扇区
	 return ReturnByte;
	 }
	 /// <summary>
	 /// 写入数据
	 /// </summary>
	 /// <param name="SectorBytes">扇区 长度512</param>
	 /// <param name="SectorIndex">扇区位置</param>
	 public void WritSector(byte[] SectorBytes, long SectorIndex)
	 {
	 if (SectorBytes.Length != 512) return;
	 if (SectorIndex > _SectorLength) return;
	 _DirverStream.Position = SectorIndex * 512;
	 _DirverStream.Write(SectorBytes, 0, 512); //写入扇区
	 }

	
	 /// <summary>
	 /// 关闭
	 /// </summary>
	 public void Close()
	 {
	 _DirverStream.Close();
	 }

	 }

	}

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