C#实现获取mp3 Tag信息的方法

using System;using System.Collections.Generic;using System.Text;using System.IO;namespace Foxer_Player_1._1{  public struct Mp3Info  {    public string identify;   //TAG，三个字节    public string Title;    //歌曲名,30个字节    public string Artist;    //歌手名,30个字节    public string Album;    //所属唱片,30个字节    public string Year;     //年,4个字符    public string Comment;   //注释,28个字节    public char reserved1;   //保留位，一个字节    public char reserved2;   //保留位，一个字节    public char reserved3;   //保留位，一个字节  }  /// <summary>  /// Mp3文件信息类  /// </summary>  public class Mp3FileInfo  {    Mp3Info info;    /// <summary>    /// 构造函数,输入文件名即得到信息    /// </summary>    /// <param name="mp3FilePos"></param>    public Mp3FileInfo(String mp3FilePos)    {      info = getMp3Info(getLast128(mp3FilePos));    }    /// <summary>    /// 获取整理后的Mp3文件名,这里以标题和艺术家名定文件名    /// </summary>    /// <returns></returns>    public String GetOriginalName()    {      return formatString(info.Title.Trim()) + "-" + formatString(info.Artist.Trim());    }    /// <summary>    /// 去除/0字符    /// </summary>    /// <param name="str"></param>    /// <returns></returns>    private static String formatString(String str)    {      return str.Replace("/0", "");    }    /// <summary>    /// 获取MP3文件最后128个字节    /// </summary>    /// <param name="FileName">文件名</param>    /// <returns>返回字节数组</returns>    public static byte[] getLast128(string FileName)    {      FileStream fs = new FileStream(FileName, FileMode.Open, Fileaccess.Read);      Stream stream = fs;      stream.Seek(-128, SeekOrigin.End);      const int seekPos = 128;      int rl = 0;      byte[] Info = new byte[seekPos];      rl = stream.Read(Info, 0, seekPos);      fs.Close();      stream.Close();      return Info;    }    /// <summary>    /// 获取MP3歌曲的相关信息    /// </summary>    /// <param name = "Info">从MP3文件中截取的二进制信息</param>    /// <returns>返回一个Mp3Info结构</returns>    public static Mp3Info getMp3Info(byte[] Info)    {      Mp3Info mp3Info = new Mp3Info();      string str = null;      int i;      int position = 0;//循环的起始值      int currentIndex = 0;//Info的当前索引值      //获取TAG标识      for (i = currentIndex; i < currentIndex + 3; i++)      {        str = str + (char)Info[i];        position++;      }      currentIndex = position;      mp3Info.identify = str;      //获取歌名      str = null;      byte[] bytTitle = new byte[30];//将歌名部分读到一个单独的数组中      int j = 0;      for (i = currentIndex; i < currentIndex + 30; i++)      {        bytTitle[j] = Info[i];        position++;        j++;      }      currentIndex = position;      mp3Info.Title = Foxer_Player_1._1.Mp3FileInfo.byteToString(bytTitle);      //获取歌手名      str = null;      j = 0;      byte[] bytArtist = new byte[30];//将歌手名部分读到一个单独的数组中      for (i = currentIndex; i < currentIndex + 30; i++)      {        bytArtist[j] = Info[i];        position++;        j++;      }      currentIndex = position;      mp3Info.Artist = Foxer_Player_1._1.Mp3FileInfo.byteToString(bytArtist);      //获取唱片名      str = null;      j = 0;      byte[] bytAlbum = new byte[30];//将唱片名部分读到一个单独的数组中      for (i = currentIndex; i < currentIndex + 30; i++)      {        bytAlbum[j] = Info[i];        position++;        j++;      }      currentIndex = position;      mp3Info.Album = Foxer_Player_1._1.Mp3FileInfo.byteToString(bytAlbum);      //获取年      str = null;      j = 0;      byte[] bytYear = new byte[4];//将年部分读到一个单独的数组中      for (i = currentIndex; i < currentIndex + 4; i++)      {        bytYear[j] = Info[i];        position++;        j++;      }      currentIndex = position;      mp3Info.Year = Foxer_Player_1._1.Mp3FileInfo.byteToString(bytYear);      //获取注释      str = null;      j = 0;      byte[] bytComment = new byte[28];//将注释部分读到一个单独的数组中      for (i = currentIndex; i < currentIndex + 25; i++)      {        bytComment[j] = Info[i];        position++;        j++;      }      currentIndex = position;      mp3Info.Comment = Foxer_Player_1._1.Mp3FileInfo.byteToString(bytComment);      //以下获取保留位      mp3Info.reserved1 = (char)Info[++position];      mp3Info.reserved2 = (char)Info[++position];      mp3Info.reserved3 = (char)Info[++position];      return mp3Info;    }    /// <summary>    /// 将字节数组转换成字符串    /// </summary>    /// <param name = "b">字节数组</param>    /// <returns>返回转换后的字符串</returns>    public static string byteToString(byte[] b)    {      Encoding enc = Encoding.GetEncoding("GB2312");      string str = enc.GetString(b);      str = str.Substring(0, str.IndexOf("#CONTENT#") >= 0 ? str.IndexOf("#CONTENT#") : str.Length);//去掉无用字符      return str;    }  }}