C#播放MP3音乐文件

网上搜集调整，测试通过。

记录

using System;
using System.Runtime.InteropServices;
using System.Text;
using System.IO;
using System.Windows.Forms;
namespace WindowsApplication7
{

    /// <summary>
    /// clsMci 的摘要说明。
    /// </summary>
    public class clsMCI
    {
        public clsMCI()
        {
            //
            // 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 = 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;
        }

        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);
            ilong = APIClass.mciSendString(Name, TemStr, TemStr.Length, 0);
            //ilong = APIClass.mciSendString("set media time format milliseconds", TemStr, TemStr.Length, 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);
                durLength = durLength.Trim();
                if (durLength == "")
                {
                    return mc.iPos = 0;
                }
                mc.iPos = unchecked((int)(Convert.ToInt32(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
        );
    }
}