I've put the script in code tag and I lost access to the previous topic! Can someone explain me how I do this? Here's the code: #Include <Memory.au3> $bVar = StringToBinary("JScript") $TcpRxLen = 256 $tMemB = DllStructCreate("byte[" & $TcpRxLen & "]") ; Create struct DllStructSetData($tMemB, 1, $bVar) $bOld = DllStructGetData($tMemB, 1) DllStructSetData($tMemB, 1, $bOld & StringToBinary(" - João Carlos.")) MsgBox(4096, "Teste", BinaryToString(DllStructGetData($tMemB, 1)