View source for IfFileExists Changes Section Flags

== Description ==
IfFileExists determines whether certain component sections are checked or unchecked.

== The Script ==
<highlight-nsis>!include Sections.nsh

Name TestSelectSection
OutFile "TestSelectSection.exe"

Page components
Page instfiles
ShowInstDetails show

; This file will exist on most computers
Section /o "autoexec.bat detected" autoexec_detected
MessageBox MB_OK autoexec
SectionEnd

Section /o "Boot.ini detected" boot_detected
MessageBox MB_OK boot
SectionEnd

Section /o "non-existing file detected" missing_detected
MessageBox MB_OK missing
SectionEnd

Function .onInit
IfFileExists C:\autoexec.bat AutoexecExists PastAutoexecCheck
AutoexecExists:
  SectionGetFlags "${autoexec_detected}" $0
  IntOp $0 $0 | ${SF_SELECTED}
  SectionSetFlags "${autoexec_detected}" $0

PastAutoexecCheck:
IfFileExists C:\boot.ini BootExists PastBootCheck
BootExists:
  !insertmacro SelectSection ${boot_detected}

PastBootCheck:
IfFileExists C:\xyz_missing.xyz MissingExists PastMissingCheck
MissingExists:
  !insertmacro SelectSection ${missing_detected}

PastMissingCheck:
FunctionEnd
</highlight-nsis>
[[Category:Code Examples]]