AutoWeight/EC.Utils/Helper/Mp3Player.cs

using System;
using System.Runtime.InteropServices;

namespace Eas.Client
{
	/// <summary>
	/// 播放MP3文件
	/// </summary>
	public class Mp3Player
	{
		//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 = "";

		private 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
		);
	}
}