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Why $WS_EX_LAYERED does not work?

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Hi all,
I created a GUI window with $WS_EX_LAYERED style, then used _WinAPI_BltBit API with parameter $SRCCOPY (no $CAPTUREBLT) to copy the desktop to the GUI window. What I want is captured the background which was covered by the GUI window.
However, the Bitblt can still captured the GUI window, not the background. How can I do to get the background instead?
#include <GuiConstantsEx.au3>
#include <WindowsConstants.au3>
#include <Misc.au3>
#include <WinAPIGdi.au3>

Opt("GUIOnEventMode", 1)
Opt("MouseCoordMode", 1)

$ZoomSizeX = 256
$ZoomSizeY = 256

_WinAPI_SetLayeredWindowAttributes($ZoomGUI,  0, 255, $LWA_ALPHA)



Func Main()
    Local $aMPosNew
    Local $dll = DllOpen("user32.dll")

        $ZoomDC = _WinAPI_GetDC($ZoomGUI)
        $DeskDC = _WinAPI_GetDC(0)

        $aMPosNew = MouseGetPos()
        _WinAPI_BitBlt($ZoomDC, 0, 0, $ZoomSizeX, $ZoomSizeY, $DeskDC, $aMPosNew[0], $aMPosNew[1],  $SRCCOPY )

        _WinAPI_ReleaseDC(0, $DeskDC)
        _WinAPI_ReleaseDC($ZoomGUI, $ZoomDC)
    Until _IsPressed("1B", $dll); ESC key
EndFunc   ;==>Main



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Have a look to >Pseudo Aero Look where I copy the desktop background under the GUI to the GUI.





Edited by UEZ

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