只在Inno安装程序中的特定页面中播放声音

Question

我正在用Inno安装程序为我的应用程序创建一个安装程序。我使用低音音频库在安装程序的背景下播放音乐。

这是我播放声音的代码。

[Code]
const
  DI_NORMAL = 3;
  FR_PRIVATE = $10;  {added to compact Mode}
  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;
  #if CheckCRC == "1"
  PM_REMOVE = 1;
  WM_QUIT   = 18;
  #endif

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_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;

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;

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

我只想在我的安装程序的一个页面中播放声音(在本例中是许可页)，当用户进入许可页、普通音乐停止和其他声音开始播放之后，在完成这个声音音乐启动播放之后，还需要禁用next按钮直到声音结束吗？

谢谢

在Martin Prikryl的帮助下，我编辑了一些代码。我的代码现在是这样的(同样，我不能把完整的代码放在文章中，因为它有很多行)

procedure InitializeWizard();
var
  SoundStream: HSTREAM;
  LicenseSoundStream: HSTREAM;
  //-some other code-//
  IniFile := ExpandConstant('{tmp}\Settings.ini');
  #if Music == "1"
  if BASS_Init(-1, 44100, 0, 0, 0) then
    begin
      BASS_SetConfig(BASS_CONFIG_GVOL_STREAM, 2500);
      ExtractTemporaryFile('{#MusicFile}');
      ExtractTemporaryFile('lic.mp3');
      SoundStream :=
        BASS_StreamCreateFile(
          False, ExpandConstant('{tmp}\{#MusicFile}'), 0, 0, 0, 0,
          BASS_UNICODE or BASS_SAMPLE_LOOP);
      LicenseSoundStream :=
        BASS_StreamCreateFile(
      False, ExpandConstant('{tmp}\lic.mp3'), 0, 0, 0, 0, BASS_UNICODE);
      BASS_ChannelPlay(SoundStream, False);
    end;
  #endif

procedure CurPageChanged(CurPageID: integer);
begin
  //-some other code-//
  #if UseLicense == "1"
  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;
    if Assigned(LicenseSoundStream) then
    begin
      BASS_ChannelPlay(LicenseSoundStream, True);
      BASS_Start;
    end;
  end
    else
  begin
    { On other pages, restore the standard music }
    if Assigned(SoundStream) then
    begin
      BASS_ChannelPlay(SoundStream, False);
    end;
  end;
  #endif
end;

它现在给了我if Assigned(LicenseSoundStream)中的编译器错误，错误是Line 4416: Column 17: Unknown identifier 'LicenseSoundStream'

-edit 2-

如你所知，我在安装程序中有两个声音

1. 是背景音乐(它在整个安装程序页面中播放，许可证页除外)
2. 是许可页声音(当用户在许可页间背景声音暂停和其他声音播放时，当再次退出其他声音开始播放时)

。

im添加按钮以禁用和启用此代码的背景声音

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;

但我的问题是，如果用户在许可间页面之前暂停背景声音，那么在许可页面内再次播放背景声音(而不是其他声音)。

Answer 1

假设您的ExtractTemporaryFile和BASS_Init调用在InitializeSetup中，如下所示：How to make Stop and Pause/Resume/Play music buttons in Inno Setup

更新代码以加载两个音乐文件：

var
  SoundStream: HSTREAM;
  LicenseSoundStream: HSTREAM;

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

然后在许可页面的CurPageChanged event function中，启动“许可”音乐：

procedure CurPageChanged(CurPageID: Integer);
begin
  if CurPageID = wpLicense then
  begin
    if LicenseSoundStream <> 0 then
    begin
      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);
    end;
  end;
end;

未经测试-可能需要很少的调整。