获取MP3歌曲信息 歌曲名 歌手名 专辑等

        /// <summary>        /// 定义结构，存放mp3信息        /// </summary>        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>        /// 取出mp3的最后128字节的信息        /// </summary>        /// <param name="filename"></param>        /// <returns></returns>        private byte[] getsonginfo(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>         private 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 = this.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 = this.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 = this.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 = this.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 = this.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>         private string byteToString(byte[] b)        {            Encoding enc = Encoding.GetEncoding("GB2312");            string str = enc.GetString(b);            str = str.Substring(0, str.IndexOf('\0') >= 0 ? str.IndexOf('\0') : str.Length);//去掉无用字符             return str;        }        /// <summary>         /// 更改文件名         /// </summary>         /// <param name="filePath">文件名</param>         /// <returns></returns>         private string ReName(string filePath)        {            if (File.Exists(filePath))            {                try                {                    Mp3Info mp3Info = new Mp3Info();                    mp3Info = this.getMp3Info(this.getsonginfo(filePath));//读出文件信息                                  if (mp3Info.Title.Trim().Length == 0)                    {                        mp3Info.Title = "未知名歌曲";//这段我自己修改过，当歌曲名信息为空时，显示未知名歌曲，而后再显示文件名                    }                    return mp3Info.Title.ToString();                }                catch (Exception)                {                    return "";                }            }            else            {                return "";            }        }