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Simple GDI+ Question

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I just want to draw a rect in specific size, then save it to file, the rect must be transparent, only line that have color, can someone point me to the right direction?

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Here we go

#include <GDIP.au3>
#include <WinAPI.au3>

Local $aResult = DllCall($ghGDIPDll, "uint", "GdipCreateBitmapFromScan0", "int", 101, "int", 101, "int", 0, "int", $GDIP_PXF32ARGB, "ptr", 0, "int*", 0)
$aResult = $aResult[6]

;Get the Graphics object
Local $hCtxt = _GDIPlus_ImageGetGraphicsContext($aResult)
;Draw the Rect
_GDIPlus_GraphicsDrawRect($hCtxt, 0, 0, 100, 100)
;Save to File
_GDIPlus_ImageSaveToFile($aResult, "Test.png")
;Show the Image

;Memory Release

Regards :)

My code:

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