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If @IPAddress1 <> "" Then
    Global $UserIP = @IPAddress1
ElseIf @IPAddress2 <> "" Then
    Global $UserIP = @IPAddress2
ElseIf @IPAddress3 <> "" Then
    Global $UserIP = @IPAddress3
ElseIf @IPAddress4 <> "" Then
    Global $UserIP = @IPAddress4
EndIf

MsgBox(0, "Adresse mac", "Votre adresse Mac est "&_GetMACFromIP($UserIP)&".")

Func _GetMACFromIP ($sIP)
    Local $MAC,$MACSize
    Local $i,$s,$r,$iIP

;Create the struct
;{
;   char    data[6];
;}MAC
    $MAC        = DllStructCreate("byte[6]")

;Create a pointer to an int
;   int *MACSize;
    $MACSize    = DllStructCreate("int")

;*MACSize = 6;
    DllStructSetData($MACSize,1,6)

;call inet_addr($sIP)
    $r = DllCall ("Ws2_32.dll", "int", "inet_addr", _
                    "str", $sIP)
    $iIP = $r[0]

;Make the DllCall
    $r = 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
    $s  = ""
    For $i = 0 To 5
        If $i Then $s = $s & ":"
        $s = $s & Hex(DllStructGetData($MAC,1,$i+1),2)
    Next

;Must free the memory after it is used
    $MAC = 0
    $MACSize = 0

;Return the user readble MAC address
    Return $s
EndFunc