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我使用低音库在我的安装程序中播放2 个声音

  1. 背景声音（在除许可证页面之外的所有安装程序页面中播放）
  2. 仅在用户进入许可页面时播放声音（背景声音暂停和新声音播放）

我使用一些帮助来获得许可声音来解决这个问题

一切正常（背景声音播放，直到用户进入许可证页面，在许可证页面中其他声音开始播放，当用户进入下一页时，背景声音再次播放）除了一个问题，如果用户这次在许可证页面之前以某种方式暂停背景音乐当用户界面再次播放许可页面背景声音时，更好地使用低音库跳过播放许可页面声音

这是我在 inno 设置中的低音代码

const
  BASS_SAMPLE_LOOP = 4;
  BASS_ACTIVE_STOPPED = 0;
  BASS_ACTIVE_PLAYING = 1;
  BASS_ACTIVE_STALLED = 2;
  BASS_ACTIVE_PAUSED  = 3;
  BASS_UNICODE = $80000000;
  BASS_CONFIG_GVOL_STREAM = {#MusicVolume};
  EncodingFlag = BASS_UNICODE;

var
  SoundStream: HSTREAM;
  LicenseSoundStream: HSTREAM;

//

function BASS_Init(device: LongInt; freq, flags: DWORD; win: HWND; clsid: Cardinal): BOOL;
    external 'BASS_Init@files:bass.dll stdcall';
  function BASS_StreamCreateFile(mem: BOOL; f: string; offset1: DWORD; offset2: DWORD; length1: DWORD; length2: DWORD; flags: DWORD): HSTREAM;
    external 'BASS_StreamCreateFile@files:bass.dll stdcall';
  function BASS_Start: BOOL;
    external 'BASS_Start@files:bass.dll stdcall';
  function BASS_Pause: BOOL;
    external 'BASS_Pause@files:bass.dll stdcall';
  function BASS_ChannelPlay(handle: DWORD; restart: BOOL): BOOL;
    external 'BASS_ChannelPlay@files:bass.dll stdcall';
  function BASS_ChannelPause(handle: DWORD): Boolean;
    external 'BASS_ChannelPause@files:bass.dll stdcall';
  function BASS_SetConfig(option: DWORD; value: DWORD ): BOOL;
    external 'BASS_SetConfig@files:bass.dll stdcall';
  function BASS_ChannelIsActive(handle: DWORD): DWORD;
    external 'BASS_ChannelIsActive@files:bass.dll stdcall';
  function BASS_Free: BOOL;
    external 'BASS_Free@files:bass.dll stdcall';

//

procedure MusicButtonClick(Sender: TObject);
begin
  case BASS_ChannelIsActive(SoundStream) of
    BASS_ACTIVE_PLAYING:
    begin
      if BASS_Pause then
        MusicButton.Caption := ExpandConstant('{cm:MusicButtonCaptionSoundOn}');
    end;
    BASS_ACTIVE_PAUSED:
    begin
      if BASS_Start then
        MusicButton.Caption := ExpandConstant('{cm:MusicButtonCaptionSoundOff}');
    end;
  end;
end;

//

if BASS_Init(-1, 44100, 0, 0, 0) then
    begin
      BASS_SetConfig(BASS_CONFIG_GVOL_STREAM, 2500);
      ExtractTemporaryFile('{#MusicFile}');
      ExtractTemporaryFile('license.mp3');
      SoundStream :=
        BASS_StreamCreateFile(
          False, ExpandConstant('{tmp}\{#MusicFile}'), 0, 0, 0, 0,
          BASS_UNICODE or BASS_SAMPLE_LOOP);
      LicenseSoundStream :=
        BASS_StreamCreateFile(
          False, ExpandConstant('{tmp}\license.mp3'), 0, 0, 0, 0, BASS_UNICODE);
      BASS_ChannelPlay(SoundStream, False);
    end;

{ if page changed to license page }

begin
    if CurPageID = wpLicense then
    begin
      AboutButton.Hide;
      WizardForm.DirEdit.Hide;
      WizardForm.DirBrowseButton.Hide;
      WizardForm.GroupEdit.Hide;
      WizardForm.GroupBrowseButton.Hide;
      WizardForm.PageNameLabel.Hide;
      WizardForm.PageDescriptionLabel.Hide;
      WizardForm.UserInfoNameLabel.Hide;
      WizardForm.UserInfoNameEdit.Hide;
      WizardForm.BackButton.Visible := False;
      MusicButton.Visible := False;
      if LicenseSoundStream <> 0 then
      begin
        if BASS_ChannelIsActive(SoundStream) then BASS_ChannelPause(SoundStream);
        BASS_ChannelPlay(LicenseSoundStream, True);
        BASS_Start;
      end;
    end
      else
    begin
      { On other pages, restore the standard music }
      if SoundStream <> 0 then
      begin
        BASS_ChannelPause(LicenseSoundStream);
        BASS_ChannelPlay(SoundStream, False);
        MusicButton.Visible := true;
      end;
    end;
  end;

我怎样才能解决这个问题？谢谢

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0 回答 0