Data from array not being inserted in command.

#include <GUIConstantsEx.au3>
Opt("GuiOnEventMode",1)
 
Global $CompanyName = IniRead("settings.ini","CompanyName","name","")
Global $GUIheight = IniRead("settings.ini","WindowSize","height","400")
Global $GUIwidth = IniRead("settings.ini","WindowSize","width","500")
Global $printserver = IniRead("settings.ini","ServerSettings", "PrintServer", "Not Found")
 
Global $Printers = IniRead("settings.ini","Printers","PrinterList","NotFound")
Global $printarr = StringSplit ($Printers, ",")
Global $iPrinternumber = UBound($printarr) - 1
Global $box[$printarr[0] + 1]
Global $hService
 
Global $iTop = 0, $iLeft =(.1 * $GUIwidth)
 
GUICreate($CompanyName & " Printer Installer", $GUIwidth, $GUIheight)
;GUISetBkColor(0x33ccff)
 
 
GUISetOnEvent($GUI_EVENT_CLOSE, "_CLOSEClicked")
 
$Title = GUICtrlCreateLabel("Select the Printers to be Installed", (.3 * $GUIwidth), 15, 300)
GUICtrlSetFont($Title, 11,400,2)
 
For $i = 1 To $iPrinternumber 
     
     If $iTop >= ($GUIheight - 100) Then
        
        $iLeft = (.6 * $GUIwidth)
        $iTop = 0
     Else
     EndIf
 
 
   $box[$i]= GUICtrlCreateCheckbox($printarr[$i], $iLeft, $iTop + 40)
     
     $iTop = $iTop + 20
  Next
 
$InstallButton = GUICtrlCreateButton("Install Selected", .1 * $GUIwidth, $GUIheight - 50, 150)
$ExitButton = GUICtrlCreateButton("Exit", .6 * $GUIwidth, $GUIheight -50, 150)
 
GUIctrlSetOnEvent($InstallButton, "_PrinterInstall")
GUICtrlSetOnEvent($ExitButton, "_CLOSEClicked")
 
GUISetState(@SW_SHOW)
 
 
While 1
   Sleep(1000)
WEnd
 
Func _CLOSEClicked ()
   Exit
EndFunc
 
Func _PrinterInstall ()
   
SplashTextOn("", "Installing printer, please wait...", 150, 75)  
 
 
For $i = 1 To $iPrinternumber
 
   If GUICtrlRead($box[$i]) = $GUI_CHECKED Then
         
      RunWait(@SystemDir & "\RUNDLL32 PRINTUI.DLL,PrintUIEntry /in /q /u /n\\" & $printserver & "\" & $printarr[$i])
      
      GUICtrlSetState($box[$i], $GUI_UNCHECKED)
   Else
      
   EndIf
   
     
  next
  
  SplashOff()
  
  MsgBox(0,"Done","Printer instlation complete")
 
EndFunc