/// <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;