unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  StdCtrls, MPlayer;

type
  TForm1 = class(TForm)
    MediaPlayer1: TMediaPlayer;
    Button1: TButton;
    Label1: TLabel;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

procedure TForm1.Button1Click(Sender: TObject);
Var
 MyErrorStr:String;
begin
 try
  MediaPlayer1.Open;
  Label1.Caption:='Current DeviceID is: '+IntToStr(MediaPlayer1.DeviceID);
 except
  MyErrorStr:='ErrorCode is : '+IntToStr(Error)+#13#10;
  ShowMessage(MyErrorStr);
 end;
end;

end.