IfFileExists Changes Section Flags

From NSIS Wiki

Description

IfFileExists determines whether certain component sections are checked or unchecked.

The Script

!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:
  ; This is what is done by sections.nsh SelectSection macro
  SectionGetFlags "${autoexec_detected}" $0
  IntOp $0 $0 | ${SF_SELECTED}
  SectionSetFlags "${autoexec_detected}" $0
 
PastAutoexecCheck:
IfFileExists C:\boot.ini BootExists PastBootCheck
BootExists:
  ; Use the macro from sections.nsh
  !insertmacro SelectSection ${boot_detected}
 
PastBootCheck:
IfFileExists C:\xyz_missing.xyz MissingExists PastMissingCheck
MissingExists:
  !insertmacro SelectSection ${missing_detected}
 
PastMissingCheck:
FunctionEnd