Delphi中用多媒体库Bass.dll播放mp3 [6]

本例效果图:

代码文件:

unit Unit1;
interface
uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, ExtCtrls;
type
  TForm1 = class(TForm)
   OpenDialog1: TOpenDialog;
   Button1: TButton;
   Button2: TButton;
   Button3: TButton;
   CheckBox1: TCheckBox;
   procedure FormCreate(Sender: TObject);
   procedure Button1Click(Sender: TObject);
   procedure Button2Click(Sender: TObject);
   procedure Button3Click(Sender: TObject);
   procedure FormDestroy(Sender: TObject);
   procedure CheckBox1Click(Sender: TObject);
  end;
var
  Form1: TForm1;
implementation
{$R *.dfm}
uses Bass;
var
  hs: HSTREAM; {流句柄}
procedure TForm1.FormCreate(Sender: TObject);
begin
  CheckBox1.Caption := '循环播放';
  if HiWord(BASS_GetVersion) <> BASSVERSION then
   MessageBox(0, '"Bass.dll" 文件版本不合适! ', nil, MB_ICONERROR);
  if not BASS_Init(-1, 44100, 0, 0, nil) then
   ShowMessage('初始化错误');
end;
{打开}
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);
  {想下面这样建立播放流, 直接就是循环播放的}
  //hs := BASS_StreamCreateFile(False, PAnsiChar(Mp3Path), 0, 0, BASS_SAMPLE_LOOP);
  if hs < BASS_ERROR_ENDED then
   Text := '打开失败'
  else
   Text := string(Mp3Path);
end;
{播放}
procedure TForm1.Button2Click(Sender: TObject);
begin
  BASS_ChannelPlay(hs, False);
end;
{暂停}
procedure TForm1.Button3Click(Sender: TObject);
begin
  BASS_ChannelPause(hs);
end;
{是否循环播放}
procedure TForm1.CheckBox1Click(Sender: TObject);
begin
  if CheckBox1.Checked then
   BASS_ChannelFlags(hs, BASS_SAMPLE_LOOP, BASS_SAMPLE_LOOP)
  else
   BASS_ChannelFlags(hs, 0, BASS_SAMPLE_LOOP);
end;
procedure TForm1.FormDestroy(Sender: TObject);
begin
  BASS_Free;
end;
end.

时间: 2024-11-03 22:13:12

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