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Help with GetKeyboardState

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I'm using the following code to test the GetKeyboardState from USER32.DLL:

$key = DllStructCreate("byte[256]")
$key2 = DllStructCreate("byte[256]")
DllCall("user32.dll", "int", "GetKeyboardState", "ptr", DllStructGetPtr($key))
DllCall("user32.dll", "int", "GetKeyboardState", "ptr", DllStructGetPtr($key2))
For $a = 0 to 0xFF
    If DllStructGetData($key, 1, $a) <> DllStructGetData($key2, 1, $a) Then
    ConsoleWrite(Hex($a, 2) & "(" & DllStructGetData($key, 1, $a) & DllStructGetData($key2, 1, $a) & ")" & @CRLF)

I press the CAPS LOCK (or other letter) in the Sleep() time, but the function detects no change. If I close the program, it detects the change :/. Why it doesn't work?

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