C uses MP to implement playback of audio files such as MP3

C # does not provide MP3 players and other audio files like to write a program to play MP3 and other audio files, you must use third-party controls or classes. This article uses the API function mciSendString to write a class that plays audio files such as MP3.

The specific source code is as follows:

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First, use the API function mciSendString to form a media player class.

Using System;

Using System.Runtime.InteropServices;

Using System.Text;

Using System.IO ;

Namespace clsMCIPlay

{

///

/// A summary description of clsMci.

///

Public class clsMCI

{

Public clsMCI()

{

//

// TODO: Add constructor logic here

//

}

/ / Define the string variable used by the API function

[MarshalAs (Unmana

gedType.ByValTStr, SizeConst=260)]

Private string Name = "" ;

[MarshalAs(UnmanagedType.ByValTStr, SizeConst=128)]

Private string durLength = "" ;

[MarshalAs(UnmanagedType.LPTStr, SizeConst=128)]

Private string TemStr ="";

Int ilong;

/ / Define the playback state enumeration variable

Public enum State

{

mPlaying = 1,

mPuase = 2,

mStop = 3

};

/ / Structural variables

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() ;

/ / Get the play file properties

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

{

MessageBox.Show("Error error!");

}

}

}

//play

Public void play()

{

TemStr = "";

TemStr = TemStr.PadLeft(127, Convert.ToChar(" "));

APIClass.mciSendString("play media", TemStr, TemStr.Length, 0);

Mc.state = State.mPlaying ;

}

//stop

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 = "";

TemS

Tr = 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;

}

//total time

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);

}

}

//current time

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

);

}

}

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