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Начиная с версии 3.2.10.0 DllCallBack функции включены в AutoIt по умолчанию (так сказать стали нативными), соответсвенно нужно немного исправить скрипт:

Код:

Global Const $WH_KEYBOARD_LL = 13
Global $hHook, $pStub_KeyProc
Global $pStub_KeyProc = DllCallbackRegister("_KeyProc", "int", "int;ptr;ptr")
Global $hmod = DllCall("kernel32.dll","hwnd","GetModuleHandle","ptr",0)
Global $hHook = DllCall("user32.dll","hwnd","SetWindowsHookEx","int", _
            $WH_KEYBOARD_LL,"ptr",DllCallbackGetPtr($pStub_KeyProc),"hwnd",$hmod[0],"dword",0)
Global $buffer = ""

MsgBox(4096,"","Type anything anywhere and it will appear in the top left corner of the screen.")

While 1
    Sleep(10)
WEnd

Func EvaluateKey($keycode)
    If (($keycode > 22) And ($keycode < 91)) _
        Or (($keycode > 47) And ($keycode < 58)) Then
        $buffer &= Chr($keycode)
        ToolTip($buffer,0,0)
    ElseIf ($keycode > 159) And ($keycode < 164) Then
        Return
    EndIf
EndFunc

Func _KeyProc($nCode, $wParam, $lParam)
    Local $ret,$KEYHOOKSTRUCT
    If $nCode < 0 Then
        $ret = DllCall("user32.dll","long","CallNextHookEx","hwnd",$hHook[0], _
                        "int",$nCode,"ptr",$wParam,"ptr",$lParam)
        Return $ret[0]
    EndIf
    If $wparam = 256 Then
        $KEYHOOKSTRUCT = DllStructCreate("dword;dword;dword;dword;ptr",$lParam)
        EvaluateKey(DllStructGetData($KEYHOOKSTRUCT,1))
    EndIf
    $ret = DllCall("user32.dll","long","CallNextHookEx","hwnd",$hHook[0], _
                    "int",$nCode,"ptr",$wParam,"ptr",$lParam)
    Return $ret[0]
EndFunc

Func OnAutoItExit()
    DllCall("user32.dll","int","UnhookWindowsHookEx","hwnd",$hHook[0])
EndFunc