C#读取媒体信息

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;  
        }  
    } 
}