Question

I am using:

; Set output path to the installation directory.
SetOutPath $INSTDIR\

SetOverwrite on

; Put file there
File "ACC\*.APP"

to overwrite a file, but if the file can’t be overwritten, then I want that the installer quits, how to do this?

Does Error Flag value needs to be used? But how?

Answer 1

The File command sets the error flag
if overwrite mode is set to ‘try’ and
the file could not be overwritten, or
if the overwrite mode is set to ‘on’
and the file could not be overwritten
and the user selects ignore

!include LogicLib.nsh
Section
ClearErrors
SetOverwrite try
SetOutPath $INSTDIR
File "ACC\*.APP"
${If} ${Errors}
  Quit
${EndIf}
SectionEnd