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I'm always getting ret. val for this function larger than 0: Local $lpszReturnString $mciLevel = DllCall('winmm.dll', 'long', 'mciSendStringA', 'str', 'status mywave level', 'str', $lpszReturnString, 'long', 64, 'long', 0) ;now my $mciLevel[0] = 328, and $mciLevel[2] is blank and I cannot get any values, why is that? P.S. I'm using windows 7 x64 P.S.S. full script is this: Local $Form = GUICreate('Sound level', 220, 50) Local $Label1 = GUICtrlCreateLabel('000', 10, 10, 30) GUISetState(@SW_SHOW, $Form) Local $lpszReturnString Local $mciInit = DllCall('winmm.dll', 'long', 'mciSendStringA', 'str', 'open new type waveaudio alias mywave', 'str', $lpszReturnString, 'long', 64, 'long', 0) If $mciInit[0] <> 0 Then Exit Do $mciLevel = DllCall('winmm.dll', 'long', 'mciSendStringA', 'str', 'status mywave level', 'str', $lpszReturnString, 'long', 64, 'long', 0) If $mciLevel[0] <> 0 Then MsgBox(0, 'Error', 'Script will now close') Exit EndIf GUICtrlSetData($Label1, $mciLevel[2]) Until GUIGetMsg() = -3 GUIDelete($Form) Exit