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The code works on windows 7 but not on XP... why so? #include <File.au3> Global $sIP, $MAs $Station=InputBox("Workstation", "enter the workstation", "") _GetMACFromIP($sIP) Local $text = StringReplace($MAs, "-", "") IniWrite(@ScriptDir & "\MAC.ini", "mac_addresses", $Station, $text) Func _GetMACFromIP($sIP) Local $MAC,$MACSize Local $MAi,$MAr ;Create the struct $MAC = DllStructCreate("byte[6]") ;Create a pointer to an int $MACSize = DllStructCreate("int") ;*MACSize = 6; DllStructSetData($MACSize,1,6) ;call inet_addr($sIP) $MAr = DllCall ("Ws2_32.dll", "int", "inet_addr", _ "str", $sIP) $iIP = $MAr[0] ;Make the DllCall $MAr = DllCall ("iphlpapi.dll", "int", "SendARP", _ "int", $iIP, _ "int", 0, _ "ptr", DllStructGetPtr($MAC), _ "ptr", DllStructGetPtr($MACSize)) ;Format the MAC address into user readble format: 00:00:00:00:00:00 $MAs = "" For $MAi = 0 To 5 If $MAi Then $MAs = $MAs & "-" $MAs = $MAs & Hex(DllStructGetData($MAC,1,$MAi+1),2) Next ;Return the user readble MAC address Return $MAs EndFunc Resolved by using this code instead: #Region ;**** Directives created by AutoIt3Wrapper_GUI **** #AutoIt3Wrapper_Outfile=MAG.exe #EndRegion ;**** Directives created by AutoIt3Wrapper_GUI **** #include <WinAPI.au3> #include <File.au3> $IPDetails=_IPDetails() $Station=InputBox("Workstation", "enter the workstation", "") Local $text = StringReplace($IPDetails[1], ":", "") IniWrite(@ScriptDir & "\MAC.ini", "mac_addresses", $Station, $text) Func _IPDetails() Local $oWMIService = ObjGet("winmgmts:{impersonationLevel = impersonate}!\\" & "." & "\root\cimv2") Local $oColItems = $oWMIService.ExecQuery("Select * From Win32_NetworkAdapterConfiguration Where IPEnabled = True", "WQL", 0x30), $aReturn[5] = [4] If IsObj($oColItems) Then For $oObjectItem In $oColItems If $oObjectItem.IPAddress(0) == @IPAddress1 Then $aReturn[1] = $oObjectItem.MACAddress $aReturn[2] = $oObjectItem.DefaultIPGateway(0) EndIf Next Return $aReturn EndIf Return SetError(1, 0, $aReturn) EndFunc ;==>_IPDetails