system Environment Variable delete when uninstall
 

in the script i use this:
ReadRegStr $0 HKLM "SYSTEM\CurrentControlSet\Control\Session Manager\Environment" "Path"
WriteRegExpandStr HKLM "SYSTEM\CurrentControlSet\Control\Session Manager\Environment" "Path" "$0;$INSTDIR\bin"

to registry the system Environment Variable.So i also want to delete it when uninstaller is running.
but use the "DeleteRegValue
" will delete all the system Environment Variables,
what i want is only to delete the value "$INSTDIR\bin".
how to do it?

Use:

http://nsis.sourceforge.net/Path_Manipulation

Thank U first!

I'm using a much simpler method to add/remove path stuff. Here I'm adding (then removing in the uninstaller portion) PHP from the system path:

code:


        ;Update the system path

        ReadRegStr $R1 HKLM "SYSTEM\CurrentControlSet\Control\Session Manager\Environment" "Path"

        ${WordFind} "$R1" "$INSTDIR\php" "E+1{" $R0

        StrCpy $R1 "$R1;$INSTDIR\php"

        WriteRegExpandStr HKLM "SYSTEM\CurrentControlSet\Control\Session Manager\Environment" "Path" "$R1" 



    ;Remove system path

    ReadRegStr $R1 HKLM "SYSTEM\CurrentControlSet\Control\Session Manager\Environment" "Path"

    ${un.WordReplace} "$R1" ";$INSTDIR\php" "" "+" $R1

    WriteRegExpandStr HKLM "SYSTEM\CurrentControlSet\Control\Session Manager\Environment" "Path" "$R1"