Write Access in $INSTDIR ?

How do I run a function to check if the user has write access to $INSTDIR, on leaving MUI_PAGE_DIRECTORY ?

I have the function, I'm just not sure how to call it and don't want to create a custom page.

!include LogicLib.nsh



!define MUI_PAGE_CUSTOMFUNCTION_LEAVE DirectoryPageLeave

!insertmacro MUI_PAGE_DIRECTORY



Function DirectoryPageLeave

  ClearErrors

  FileOpen $R0 $INSTDIR\temp.tmp w

  FileClose $R0

  ${If} ${Errors}

    MessageBox MB_OK|MB_ICONSTOP "Path $INSTDIR is write protected!"

    Abort

  ${EndIf}

FunctionEnd

Stu

<3, works great.

Better use "a" instead of "w" in case the file already exists. A temporary filename with GetTempFileName might be even better.