NSIS自动检测

!include "MUI.nsh"
OutFile "S32.exe"

!define MUI_PAGE_CUSTOMFUNCTION_PRE ComponentsPage1Pre
!insertmacro MUI_PAGE_COMPONENTS

Sectiongroup "完整独立程序" SecOL3
  Section /o "QQ直播程序" Sec60
  SectionIn 1 2
  SetOutPath "$TEMP"
setoverwrite on
  File "QQLive5.0.3240.exe"
  ExecWait '"$TEMP\QQLive5.0.3240.exe /S'
SectionEnd
  Section /o "QQ音乐程序" Sec20
  SectionIn 1 2
  SetOutPath "$TEMP"
setoverwrite on
  File "QQMusicClickInstall.exe"
  ExecWait '"$TEMP\QQMusicClickInstall.exe /S'
SectionEnd
  Section /o "QQ医生程序" Sec30
  SectionIn 1 2
  SetOutPath "$TEMP"
setoverwrite on
  File "qqdoctor1.3kb1setup.exe"
  ExecWait '"$TEMP\qqdoctor1.3kb1setup.exe /S'
SectionEnd
  Section  /o "QQ旋风程序" Sec50
  SectionIn 1
  SetOutPath "$TEMP"
setoverwrite on
  File "qqdownload1.4b1.exe"
  ExecWait '"$TEMP\qqdownload1.4b1.exe /S'
SectionEnd
  Section  /o "QQ游戏程序" Sec40
  SectionIn 1 2
  SetOutPath "$TEMP"
setoverwrite on
  File "QQGame2007Beta1_setup.EXE"
  ExecWait '"$TEMP\QQGame2007Beta1_setup.EXE /S'
SectionEnd
  SectionGroupend

Function ComponentsPage1Pre
  Call Check1
  Call Check2
  Call Check3
  Call Check4
  Call Check5
FunctionEnd

Function Check1
IfFileExists $PROGRAMFILES\NSIS\NSIS.exe skip
   !insertmacro UnselectSection ${Sec60}
  skip:
FunctionEnd

Function Check2
IfFileExists $PROGRAMFILESA\A.exe skip
   !insertmacro UnselectSection ${Sec20}
  skip:
FunctionEnd

Function Check3
IfFileExists $PROGRAMFILES\DAEMON Tools\DAEMON.exe skip
   !insertmacro UnselectSection ${Sec30}
  skip:
FunctionEnd

Function Check4
IfFileExists $PROGRAMFILES\QQGAME\Game.exe skip
   !insertmacro UnselectSection ${Sec40}
  skip:
FunctionEnd

Function Check5
IfFileExists $windir\notepad skip
   !insertmacro UnselectSection ${Sec50}
  skip:
FunctionEnd

脚本例子二：

!include Sections.nsh

Name TestSelectSection
OutFile "TestSelectSection.exe"

Page components
Page instfiles
ShowInstDetails show

Sectiongroup "完整独立程序" SecOL3
  Section /o "QQ直播程序" Sec60
  SectionIn 1 2
  SetOutPath "$TEMP"
setoverwrite on
  File "QQLive5.0.3240.exe"
  ExecWait '"$TEMP\QQLive5.0.3240.exe /S'
SectionEnd
  Section /o "QQ音乐程序" Sec20
  SectionIn 1 2
  SetOutPath "$TEMP"
setoverwrite on
  File "QQMusicClickInstall.exe"
  ExecWait '"$TEMP\QQMusicClickInstall.exe /S'
SectionEnd
  Section /o "QQ医生程序" Sec30
  SectionIn 1 2
  SetOutPath "$TEMP"
setoverwrite on
  File "qqdoctor1.3kb1setup.exe"
  ExecWait '"$TEMP\qqdoctor1.3kb1setup.exe /S'
SectionEnd
  Section  /o "QQ旋风程序" Sec50
  SectionIn 1
  SetOutPath "$TEMP"
setoverwrite on
  File "qqdownload1.4b1.exe"
  ExecWait '"$TEMP\qqdownload1.4b1.exe /S'
SectionEnd
  Section  /o "QQ游戏程序" Sec40
  SectionIn 1 2
  SetOutPath "$TEMP"
setoverwrite on
  File "QQGame2007Beta1_setup.EXE"
  ExecWait '"$TEMP\QQGame2007Beta1_setup.EXE /S'
SectionEnd
  SectionGroupend

IfFileExists $windir\notepad.exe QQliveExists PastQQliveCheck
QQliveExists:
  !insertmacro SelectSection ${SEC60}
PastQQliveCheck:
;/////////////////////QQ音乐//////////////////////////////////////////////////
IfFileExists $windir\notepad.exe QQmusicExists PastQQmusicCheck
QQmusicExists:
  !insertmacro SelectSection ${SEC20}
PastQQmusicCheck:
;/////////////////////QQ医生//////////////////////////////////////////////////
IfFileExists $windir\notepad.exe QQdoctorExists PastQQdoctorCheck
QQdoctorExists:
  !insertmacro SelectSection ${SEC30}
PastQQdoctorCheck:
;/////////////////////QQ旋风//////////////////////////////////////////////////
IfFileExists $windir\notepad.exe QQdownloadExists PastQQdownloadCheck
QQdownloadExists:
  !insertmacro SelectSection ${SEC40}
PastQQdownloadCheck:
;//////////////////////QQ游戏/////////////////////////////////////////////////
IfFileExists $windir\notepad.exe QQgameExists PastQQgameCheck
QQgameExists:
  !insertmacro SelectSection ${SEC50}
PastQQgameCheck:
FunctionEnd 

!include Sections.nsh

Section "Photoshop plug-ins" ps_plugins
SectionEnd

Function .onInit
IfFileExsists $PROGRAMFILES\Photoshop\main.exe psins
!insertmacro SelectSection ${ps_plugins}
Goto done
psins:
!insertmacro UnselectSection ${ps_plugins}
done:
FunctionEnd