somewhat nonstandard help for newbie
Hi. I hope that the question I'll be asking isn't too stupid: I've looked everywhere, but I can't find enough information to do what I want to do (especially in the time frame that's been given to me). Even a nudge in the right direction would be appreciated.
I'm trying to write an nsis procedure that installs a service pack to patch a large program. It'll have to extract archives, copy files, etc., and most of that's not hard to do.
Through use of some help docs I've thrown together a page that should ask the user where to find a certain directory, and that shouldn't let the user continue with the procedure if a particular file (tar.exe) does not exist on that directory.
The page's creator function looks like this:
Function FindingTarPage
!insertmacro MUI_HEADER_TEXT "$(FINDTAR_TITLE)" "$(FINDTAR_SUBTITLE)"
!insertmacro MUI_INSTALLOPTIONS_DISPLAY "FindTar"
!insertmacro MUI_INSTALLOPTIONS_READ $locOfTar "FindTar" "Field 2" "State"
FunctionEnd
Is there some way to make it so that the user can click back without choosing a correct directory, while being unable to click forward? I'm finding the MUI code pretty incomprehensible.
(Current solution: putting code like the following at the end of the creator function, which is - obviously - quite suboptimal.)
IfFileExists $locOfTar\tar.exe +3 0
MessageBox MB_OKCANCEL "tar.exe is not present in that directory. Try again, or press cancel to exit the installer." IDOK -4 IDCANCEL 0
Quit