play mp3 in c#

using System;

using System.Runtime.InteropServices;

using System.Text;

using System.IO;

using System.Windows.Forms;

namespace kouyuView

{

///

/// 的摘要说明。

///

public class Mp3Play

{

public Mp3Play()

{

//

// TODO: 在此处添加构造函数逻辑

//

}

    //定义API函数使用的字符串变量
    [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 260)]
    private string Name = "";
    [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 128)]
    private string durLength = "";
    [MarshalAs(UnmanagedType.LPTStr, SizeConst = 128)]
    private string TemStr = "";
    int ilong;
    //定义播放状态枚举变量
    public enum State
    {
        mPlaying = 1,
        mPuase = 2,
        mStop = 3
    };
    //结构变量
    public struct structMCI
    {
        public bool bMut;
        public int iDur;
        public int iPos;
        public int iVol;
        public int iBal;
        public string iName;
        public State state;
    };

    public structMCI mc = new structMCI();

    //取得播放文件属性
    public string FileName
    {
        get
        {
            return mc.iName;
        }
        set
        {
            //ASCIIEncoding asc = new ASCIIEncoding();
            try
            {
                TemStr = "";
                TemStr = TemStr.PadLeft(127, Convert.ToChar(" "));
                Name = Name.PadLeft(260, Convert.ToChar(" "));
                mc.iName = value;
                ilong = APIClass.GetShortPathName(mc.iName, Name, Name.Length);
                Name = GetCurrPath(Name);
                //Name = "open " + Convert.ToChar(34) + Name + Convert.ToChar(34) + " alias media";
                Name = "open " + Convert.ToChar(34) + Name + Convert.ToChar(34) + " alias media";
                ilong = APIClass.mciSendString("close all", TemStr, TemStr.Length, 0);
                ilong = APIClass.mciSendString(Name, TemStr, TemStr.Length, 0);
                ilong = APIClass.mciSendString("set media time format milliseconds", TemStr, TemStr.Length, 0);
                mc.state = State.mStop;
            }
            catch
            {
            }
        }
    }
    //播放
    public void play()
    {
        TemStr = "";
        TemStr = TemStr.PadLeft(127, Convert.ToChar(" "));
        APIClass.mciSendString("play media", TemStr, TemStr.Length, 0);
        mc.state = State.mPlaying;
    }
    //停止
    public void StopT()
    {
        TemStr = "";
        TemStr = TemStr.PadLeft(128, Convert.ToChar(" "));
        ilong = APIClass.mciSendString("close media", TemStr, 128, 0);
        ilong = APIClass.mciSendString("close all", TemStr, 128, 0);
        mc.state = State.mStop;
    }

    public void Puase()
    {
        TemStr = "";
        TemStr = TemStr.PadLeft(128, Convert.ToChar(" "));
        ilong = APIClass.mciSendString("pause media", TemStr, TemStr.Length, 0);
        mc.state = State.mPuase;
    }
    private string GetCurrPath(string name)
    {
        if (name.Length < 1) return "";
        name = name.Trim();
        name = name.Substring(0, name.Length - 1);
        return name;
    }
    //总时间
    public int Duration
    {
        get
        {
            durLength = "";
            durLength = durLength.PadLeft(128, Convert.ToChar(" "));
            APIClass.mciSendString("status media length", durLength, durLength.Length, 0);
            durLength = durLength.Trim();
            if (durLength == "") return 0;
            return (int)(Convert.ToDouble(durLength) / 1000f);
        }
    }

    //当前时间
    public int CurrentPosition
    {
        get
        {
            durLength = "";
            durLength = durLength.PadLeft(128, Convert.ToChar(" "));
            APIClass.mciSendString("status media position", durLength, durLength.Length, 0);
            mc.iPos = (int)(Convert.ToDouble(durLength) / 1000f);
            return mc.iPos;
        }
    }
}

public class APIClass
{
    [DllImport("kernel32.dll", CharSet = CharSet.Auto)]
    public static extern int GetShortPathName(
    string lpszLongPath,
    string shortFile,
    int cchBuffer
    );

    [DllImport("winmm.dll", EntryPoint = "mciSendString", CharSet = CharSet.Auto)]
    public static extern int mciSendString(
    string lpstrCommand,
    string lpstrReturnString,
    int uReturnLength,
    int hwndCallback
    );
}

}