Installation Directory Restrictions

[madams]

Hello,

What I am trying to do is check the installation directory chosen by the user, and if it contains any spaces (ex: Program Files) disable the "next" button and show a message box informing the user that the installation directory may not contain spaces. I know how to disable the "next" button and create a message box, but I can't figure out how to check for spaces in the $INSTDIR variable.

If anyone knows how to do this, please let me know.

Thanks.

[Red Wine]

code:
; ---------------------------------------------------------------

; Function StrOutOfStr 

                                                               /*

     Usage:



       !insertmacro StrOutOfStr     ; for installer

       !insertmacro un.StrOutOfStr  ; for uninstaller





     Whithin installer section/function use:



          ${StrOutOfStr} "Input_String" "String_To_Get" "$var"

               $var = String_To_Get if found

               if not found/error then $var = error





     Whithin uninstaller section/function use:



          ${un.StrOutOfStr} "Input_String" "String_To_Get" "$var"

               $var = String_To_Get if found

               if not found/error then $var = error

                                                               */



!macro StrOutOfStrFunc UN

Function ${UN}StrOutOfStr

   Exch $0 ;str to get

   Exch

   Exch $1 ;input str

   Push $2

   Push $3

   Push $4

   Push $5



        StrCpy $3 "0"

        StrLen $4 "$0"

        StrLen $5 "$1"

        IntCmp $4 $5 0 0 _err

        Intop $5 $5 - $4



  _start:

        StrCpy $2 "$1" $4 $3

        StrCmp "$2" "$0" _done

        IntCmp "$3" "$5" _err

        Intop $3 $3 + 1

        Goto _start



   _err:

        StrCpy $2 "error"



  _done:

        StrCpy $0 "$2"



   Pop $5

   Pop $4

   Pop $3

   Pop $2

   Pop $1

   Exch $0

FunctionEnd

!macroend



!macro StrOutOfStrCall _UN _INPUT _FIND _RESULT

    Push "${_INPUT}"

    Push "${_FIND}"

    Call ${_UN}StrOutOfStr

    Pop "${_RESULT}"

!macroend



!macro StrOutOfStr

    !define StrOutOfStr `!insertmacro StrOutOfStrCall ""`

    !insertmacro StrOutOfStrFunc ""

!macroend



!macro un.StrOutOfStr

    !define un.StrOutOfStr `!insertmacro StrOutOfStrCall "un."`

    !insertmacro StrOutOfStrFunc "un."

!macroend





;----------------------------------------

; Example of usage



outfile 'test.exe'

ShowInstDetails show



!define STRING_TO_GET  " "



!insertmacro StrOutOfStr

;!insertmacro un.StrOutOfStr



Section -

    ${StrOutOfStr} "$PROGRAMFILES"  "${STRING_TO_GET}"  "$R0"

     DetailPrint "Search result: [$R0]"

SectionEnd

[madams]

Thanks for the code Red Wine. I'm pretty new to NSIS though, and I'm not totally sure how I'm supposed to use it. If you could give me little bit more usage information, that would be great.

Thanks.

[Red Wine]

Don't know what else should I add, it is a function that you can use to find a specific string within a given sting, so it finds the space for your case.
There is a small example of usage as well, just copy/paste and compile the code to see the action.
Furthermore, you said that you know all the rest