给你个我用的例子：
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; 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}
\XXX\Common downloader
DefaultGroupName=XXX\Common 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:Languages\Chinese
.
isl"
Name: "English"; MessagesFile: "compiler:Languages\English
.
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: "Software\XXX"; Flags: createvalueifdoesntexist
Root: HKLM; Subkey: "Software\XXX\Common downloader"; Flags: uninsdeletekeyifempty
Root: HKLM; Subkey: "Software\XXX\Common downloader"; ValueType:
string
; ValueName: "Path"; ValueData: "
{app}
"
Root: HKLM; Subkey: "Software\XXX\Common downloader"; ValueType:
string
; ValueName: "Version"; ValueData: "V1
.0.0
"
Root: HKLM; Subkey: "Software\XXX\Common downloader"; ValueType: dword; ValueName: "VersionNum"; ValueData: "
100
"
Root: HKLM; Subkey: "Software\XXX\Common 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,
'Software\XXX\Common 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,
'Software\XXX\Common 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
;
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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。