Inno Setup 脚本

给你个我用的例子：
; 脚本用 Inno Setup 脚本向导生成。
; 查阅文档获取创建 INNO SETUP 脚本文件详细资料!
 
[Setup]
AppName=Common downloader
AppVerName=Common downloader
DefaultDirName={pf}XXXCommon downloader
DefaultGroupName=XXXCommon downloader
DisableProgramGroupPage=yes
OutputDir= .Setup
OutputBaseFilename=Common downloader setup V1.0.0
Compression=lzma
SolidCompression=yes
VersionInfoCompany=XXX
VersionInfoVersion=1.0.0
 
[Languages]
Name: "Chinese"; MessagesFile: "compiler:LanguagesChinese.isl"
Name: "English"; MessagesFile: "compiler:LanguagesEnglish.isl"
 
[Tasks]
Name: "desktopicon"; Description: "{cm:CreateDesktopIcon}"; GroupDescription: "{cm:AdditionalIcons}"; Flags: dontinheritcheck
 
[Files]
Source: "CMDL.exe"; DestName: "Common downloader.exe"; DestDir: "{app}"; Flags: ignoreversion
Source: "DL.dll"; DestDir: "{app}"; Flags: ignoreversion
Source: "DM.dll"; DestDir: "{app}"; Flags: ignoreversion
Source: "config.ini"; DestDir: "{app}"; Flags: ignoreversion
Source: "App*"; DestDir: "{app}\App"; Flags: ignoreversion recursesubdirs createallsubdirs
Source: "Boot*"; DestDir: "{app}\Boot"; Flags: ignoreversion recursesubdirs createallsubdirs
Source: "Resource_cn*"; DestDir: "{app}Resource"; Languages: Chinese; Flags: ignoreversion recursesubdirs createallsubdirs
Source: "Resource_en*"; DestDir: "{app}Resource"; Languages: English; Flags: ignoreversion recursesubdirs createallsubdirs
; 注意: 不要在任何共享系统文件中使用“Flags: ignoreversion”
 
[Icons]
Name: "{group}Common downloader"; Filename: "{app}Common downloader.exe"
Name: "{group}{cm:UninstallProgram,Common downloader}"; Filename: "{uninstallexe}"
Name: "{userdesktop}Common downloader"; Filename: "{app}Common downloader.exe"; Tasks: desktopicon
 
[Run]
Filename: "{app}Common downloader.exe"; Description: "{cm:LaunchProgram,Common downloader}"; Flags: nowait postinstall skipifsilent
 
[Registry]
Root: HKLM; Subkey: "SoftwareXXX"; Flags: createvalueifdoesntexist
Root: HKLM; Subkey: "SoftwareXXXCommon downloader"; Flags: uninsdeletekeyifempty
Root: HKLM; Subkey: "SoftwareXXXCommon downloader"; ValueType: string; ValueName: "Path"; ValueData: "{app}"
Root: HKLM; Subkey: "SoftwareXXXCommon downloader"; ValueType: string; ValueName: "Version"; ValueData: "V1.0.0"
Root: HKLM; Subkey: "SoftwareXXXCommon downloader"; ValueType: dword; ValueName: "VersionNum"; ValueData: "100"
Root: HKLM; Subkey: "SoftwareXXXCommon downloader"; ValueType: string; ValueName: "Release Date"; ValueData: "2008/09/29"
 
[Code]
function InitializeSetup(): Boolean;
var
   Version: string;
   strPath: string;
   ResultCode: Integer;
begin
   Result:= TRUE;
  //read the version
  if RegQueryStringValue(HKEY_LOCAL_MACHINE, 'SoftwareXXXCommon downloader',
     'Version', Version) then
  begin
    // Successfully read the value
    Version := Format('Exist the version %s,whether uninstall it?',[Version]);
    if MsgBox(Version,mbConfirmation,MB_YESNO) = IDYES then
    begin
     //read the path
     if RegQueryStringValue(HKEY_LOCAL_MACHINE, 'SoftwareXXXCommon downloader',
     'Path', strPath) then
        begin
         // Successfully read the value
         strPath:= strPath + 'unins000.exe';
         Exec(ExpandConstant(strPath), '', '', SW_SHOW,
              ewWaitUntilTerminated, ResultCode);
        end;
    end else
    Result:= FALSE;
  end;
end;
这个例子可以在安装之前卸载以前的版本，并提示你卸载之前的版本信息。