Delphi中用多媒體庫Bass.dll播放mp3 [3] - 打開、播放、暫停、停止(2)

窗體文件:

object Form1: TForm1
　 Left = 0
　 Top = 0
　 Caption = 'Form1'
　 ClIEntHeight = 117
　 ClIEntWidth = 202
　 Color = clBtnFace
　 Font.Charset = DEFAULT_CHARSET
　 Font.Color = clWindowText
　 Font.Height = -11
　 Font.Name = 'Tahoma'
　 Font.Style = []
　 OldCreateOrder = False
　 OnCreate = FormCreate
　 OnDestroy = FormDestroy
　 PixelsPerInch = 96
　 TextHeight = 13
　 object Button1: TButton
　　 Left = 16
　　 Top = 17
　　 Width = 75
　　 Height = 25
　　 Caption = #25171#24320
　　 TabOrder = 0
　　 OnClick = Button1Click
　 end
　 object Button2: TButton
　　 Left = 112
　　 Top = 17
　　 Width = 75
　　 Height = 25
　　 Caption = #25773#25918
　　 TabOrder = 1
　　 OnClick = Button2Click
　 end
　 object Button3: TButton
　　 Left = 112
　　 Top = 48
　　 Width = 75
　　 Height = 25
　　 Caption = #26242#20572
　　 TabOrder = 2
　　 OnClick = Button3Click
　 end
　 object Button4: TButton
　　 Left = 112
　　 Top = 79
　　 Width = 75
　　 Height = 25
　　 Caption = #20572#27490
　　 TabOrder = 3
　　 OnClick = Button4Click
　 end
　 object OpenDialog1: TOpenDialog
　　 Left = 40
　　 Top = 56
　 end