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 程式師世界 >> 編程語言 >> 更多編程語言 >> Delphi >> Delphi中用多媒體庫Bass.dll播放mp3 [7] - 獲取當前的播放狀態

Delphi中用多媒體庫Bass.dll播放mp3 [7] - 獲取當前的播放狀態

編輯:Delphi

本例效果圖:

代碼文件:

unit Unit1;
interface
uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, ExtCtrls;
type
  TForm1 = class(TForm)
   OpenDialog1: TOpenDialog;
   Timer1: TTimer;
   Button1: TButton;
   Button2: TButton;
   Button3: TButton;
   Button4: TButton;
   procedure FormCreate(Sender: TObject);
   procedure FormDestroy(Sender: TObject);
   procedure Button1Click(Sender: TObject);
   procedure Button2Click(Sender: TObject);
   procedure Button3Click(Sender: TObject);
   procedure Button4Click(Sender: TObject);
   procedure Timer1Timer(Sender: TObject);
  end;
var
  Form1: TForm1;
implementation
{$R *.dfm}
uses Bass;
var
  hs: HSTREAM; {流句柄}
procedure TForm1.FormCreate(Sender: TObject);
begin
  Timer1.Interval := 200;
  if HiWord(BASS_GetVersion) <> BASSVERSION then
   MessageBox(0, '"Bass.dll" 文件版本不合適! ', nil, MB_ICONERROR);
  if not BASS_Init(-1, 44100, 0, 0, nil) then
   ShowMessage('初始化錯誤');
end;
{打開}
procedure TForm1.Button1Click(Sender: TObject);
var
  Mp3Path: AnsiString;
begin
  BASS_StreamFree(hs);
  OpenDialog1.Filter := 'Mp3 文件(*.mp3)|*.mp3|Wav 文件(*.wav)|*wav';
  if OpenDialog1.Execute then
   Mp3Path := AnsiString(OpenDialog1.FileName);
  hs := BASS_StreamCreateFile(False, PAnsiChar(Mp3Path), 0, 0, 0);
  {想下面這樣建立播放流, 直接就是循環播放的}
  //hs := BASS_StreamCreateFile(False, PAnsiChar(Mp3Path), 0, 0, BASS_SAMPLE_LOOP);
  if hs < BASS_ERROR_ENDED then Text := '打開失敗'
end;
{播放}
procedure TForm1.Button2Click(Sender: TObject);
begin
  BASS_ChannelPlay(hs, False);
end;
{暫停}
procedure TForm1.Button3Click(Sender: TObject);
begin
  BASS_ChannelPause(hs);
end;
{停止}
procedure TForm1.Button4Click(Sender: TObject);
begin
  BASS_ChannelStop(hs);
end;
{監視播放狀態}
procedure TForm1.Timer1Timer(Sender: TObject);
var
  str: string;
begin
  if hs = 0 then Exit; {如果播放流沒有建立則退出}
  case BASS_ChannelIsActive(hs) of
   BASS_ACTIVE_STOPPED: str := '停止狀態';
   BASS_ACTIVE_PLAYING: str := '正在播放';
   BASS_ACTIVE_STALLED: str := '失速狀態, 正在等待數據';
   BASS_ACTIVE_PAUSED: str := '暫停狀態';
  end;
  Text := str;
end;
procedure TForm1.FormDestroy(Sender: TObject);
begin
  BASS_Free;
end;
end.

窗體文件:

object Form1: TForm1
  Left = 222
  Top = 114
  Caption = 'Form1'
  ClientHeight = 90
  ClientWidth = 254
  Color = clBtnFace
  Font.Charset = DEFAULT_CHARSET
  Font.Color = clWindowText
  Font.Height = -11
  Font.Name = 'Tahoma'
  Font.Style = []
  OldCreateOrder = False
  Position = poDesigned
  OnCreate = FormCreate
  OnDestroy = FormDestroy
  PixelsPerInch = 96
  TextHeight = 13
  object Button1: TButton
   Left = 49
   Top = 17
   Width = 75
   Height = 25
   Caption = #25171#24320
   TabOrder = 0
   OnClick = Button1Click
  end
  object Button2: TButton
   Left = 130
   Top = 17
   Width = 75
   Height = 25
   Caption = #25773#25918
   TabOrder = 1
   OnClick = Button2Click
  end
  object Button3: TButton
   Left = 49
   Top = 48
   Width = 75
   Height = 25
   Caption = #26242#20572
   TabOrder = 2
   OnClick = Button3Click
  end
  object Button4: TButton
   Left = 130
   Top = 48
   Width = 75
   Height = 25
   Caption = #20572#27490
   TabOrder = 3
   OnClick = Button4Click
  end
  object OpenDialog1: TOpenDialog
   Left = 216
  end
  object Timer1: TTimer
   OnTimer = Timer1Timer
  end

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