gdi+ transparenz-problem

[autoit]

#include <GDIPlus.au3>
#include <WindowsConstants.au3>
_GDIPlus_Startup()
_splatter()

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Func _splatter()
$hImageS = _GDIPlus_ImageLoadFromFile("blut.png")
$iW = _GDIPlus_ImageGetWidth($hImageS)
$iH = _GDIPlus_ImageGetHeight($hImageS)
$GUIsplatter = GUICreate("",$iW, $iH,0,@DesktopHeight-$iH,$WS_POPUP,BitOR($WS_EX_LAYERED,$WS_EX_TOPMOST))
;~ GUISetBkColor(0xABCDEF)
GUISetState(@SW_SHOW)
;~ Sleep(1000)
;~ _WinAPI_SetLayeredWindowAttributes($GUIsplatter, 0xABCDEF, 255)
Global $hImageS, $hGraphicS
$hGraphicS = _GDIPlus_GraphicsCreateFromHWND($GUIsplatter)
$splatterBlut = _GDIPlus_GraphicsDrawImage($hGraphicS,$hImageS,0,0)
SetTransparentBitmap($GUIsplatter, $hImageS)
sleep(5000)
_GDIPlus_GraphicsDispose($hGraphicS)
_GDIPlus_ImageDispose($hImageS)
GUIDelete($GUIsplatter)
EndFunc

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Func SetTransparentBitmap($hGUI, $hImage, $iOpacity = 0xFF)
Local $hScrDC, $hMemDC, $hBitmap, $hOld, $pSize, $tSize, $pSource, $tSource, $pBlend, $tBlend
$hScrDC = _WinAPI_GetDC(0)
$hMemDC = _WinAPI_CreateCompatibleDC($hScrDC)
$hBitmap = _GDIPlus_BitmapCreateHBITMAPFromBitmap($hImage)
$hOld = _WinAPI_SelectObject($hMemDC, $hBitmap)
$tSize = DllStructCreate($tagSIZE)
$pSize = DllStructGetPtr($tSize)
DllStructSetData($tSize, "X", _GDIPlus_ImageGetWidth($hImage))
DllStructSetData($tSize, "Y", _GDIPlus_ImageGetHeight($hImage))
$tSource = DllStructCreate($tagPOINT)
$pSource = DllStructGetPtr($tSource)
$tBlend = DllStructCreate($tagBLENDFUNCTION)
$pBlend = DllStructGetPtr($tBlend)
DllStructSetData($tBlend, "Alpha", $iOpacity)
DllStructSetData($tBlend, "Format", 1)
_WinAPI_UpdateLayeredWindow($hGUI, $hMemDC, 0, $pSize, $hMemDC, $pSource, 0, $pBlend, $ULW_ALPHA)
_WinAPI_ReleaseDC(0, $hScrDC)
_WinAPI_SelectObject($hMemDC, $hOld)
_WinAPI_DeleteObject($hBitmap)
_WinAPI_DeleteDC($hMemDC)
EndFunc ;==>SetTransparentBitmap

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