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[NutStomper]

Edited July 13, 2013 by NutStomper

[Mat]

Problem seems to be fixed by creating the graphics before showing the GUI. For example this works, just by switching the order of two lines:

#AutoIt3Wrapper_Au3Check_Parameters=-q -d -w 1 -w 2 -w 3 -w 4 -w 5 -w 6 -w 7
#include <GUIConstantsEx.au3>
#include <GDIPlus.au3>

If Not _GDIPlus_Startup() Then Exit
_Main()
_GDIPlus_Shutdown()

Func _Main()
    ; Create GUI 1
    Local $h_GUI_1 = GUICreate("GUI without Graphic", 200, 600, 200)
    GUISetState()
    Local $h_Graphics = _GDIPlus_GraphicsCreateFromHWND($h_GUI_1)
    _GDIPlus_GraphicsDrawLine($h_Graphics, 0, 250, 200, 250)
    _GDIPlus_GraphicsDispose($h_Graphics)
    ; Create GUI 2
    Local $h_GUI_2 = GUICreate("GUI with Graphic", 200, 600, 450)
    GUICtrlCreateGraphic(10, 100, 56, 56)
    GUICtrlSetGraphic(-1, $GUI_GR_COLOR, 0x0000FF, 0x0000FF)
    GUICtrlSetGraphic(-1, $GUI_GR_PIE, 28, 28, 27, 90, 360)
    $h_Graphics = _GDIPlus_GraphicsCreateFromHWND($h_GUI_2) ; <<<<<<< Moved this line before GUISetState
    GUISetState()
    _GDIPlus_GraphicsDrawLine($h_Graphics, 0, 250, 200, 250)
    _GDIPlus_GraphicsDispose($h_Graphics)
    While 1
        If GUIGetMsg() = -3 Then ExitLoop
    WEnd
EndFunc

But no, that is most strange and I would not expect it. You might get an answer as to why if you are lucky, but I don't think its anything to do with AutoIt.

Edit: Actually it works like this too:

#AutoIt3Wrapper_Au3Check_Parameters=-q -d -w 1 -w 2 -w 3 -w 4 -w 5 -w 6 -w 7
#include <GUIConstantsEx.au3>
#include <GDIPlus.au3>

If Not _GDIPlus_Startup() Then Exit
_Main()
_GDIPlus_Shutdown()

Func _Main()
    ; Create GUI 1
    Local $h_GUI_1 = GUICreate("GUI without Graphic", 200, 600, 200)
    GUISetState()
    Local $h_Graphics = _GDIPlus_GraphicsCreateFromHWND($h_GUI_1)
    _GDIPlus_GraphicsDrawLine($h_Graphics, 0, 250, 200, 250)
    _GDIPlus_GraphicsDispose($h_Graphics)
    ; Create GUI 2
    Local $h_GUI_2 = GUICreate("GUI with Graphic", 200, 600, 450)
    $h_Graphics = _GDIPlus_GraphicsCreateFromHWND($h_GUI_2)
    GUICtrlCreateGraphic(10, 100, 56, 56)
    GUICtrlSetGraphic(-1, $GUI_GR_COLOR, 0x0000FF, 0x0000FF)
    GUICtrlSetGraphic(-1, $GUI_GR_PIE, 28, 28, 27, 90, 360)
    GUISetState()
    _GDIPlus_GraphicsDrawLine($h_Graphics, 0, 250, 200, 250)
    _GDIPlus_GraphicsDispose($h_Graphics)
    While 1
        If GUIGetMsg() = -3 Then ExitLoop
    WEnd
EndFunc

Edited December 13, 2012 by Mat

[UEZ]

I don't know why this happens but you can use this way:

...
    GUICtrlCreateGraphic(0, 0, 200, 600)
    GUICtrlSetGraphic(-1, $GUI_GR_COLOR, 0x0000FF, 0x0000FF)
    GUICtrlSetGraphic(-1, $GUI_GR_PIE, 38, 100, 27, 90, 360)
...

Btw, why are you mixing the graphic elements?

Br,

UEZ