GDI+ background disappear if minimize + maximize

[lillo78]

Hi, i've created a GUI with a background .png file using GDI+ . If i minimize and then restore the background is not shown anymore, same thing happens when maximizing the GUI

Here's the basic code where the gui is created.

_GDIPlus_Startup()
    Local $hImage = _GDIPlus_ImageLoadFromFile($FILEPATH_BACKGROUND)
    ; Create a GUI with various controls.

    Local $hGUI = GUICreate("My GUI", $WIDTH, $HEIGHT)
    GUICtrlSetState(-1, $GUI_DISABLE)
    GUISetState(@SW_SHOW, $hGUI)

    #Region Background
        Local $hGraphics = _GDIPlus_GraphicsCreateFromHWND($hGUI) ;create a Graphics object from a window handle
        _GDIPlus_GraphicsClear($hGraphics, 0xFF404040) ;clear graphic handle with dark grey (background)
        _GDIPlus_GraphicsSetSmoothingMode($hGraphics, $GDIP_SMOOTHINGMODE_HIGHQUALITY) ;sets the graphics object rendering quality (antialiasing)
        Local $hTexture = _GDIPlus_TextureCreate($hImage)
        _GDIPlus_GraphicsFillRect($hGraphics, -1, -1, $WIDTH, $HEIGHT, $hTexture) ;draw rectangle with texture as a brush
    #EndRegion Background

any help will be much appreciated.

Thnx.

[UEZ]

You have to repaint the graphic on $GUI_EVENT_RESTORE event.

[lillo78]

Thnak you @UEZ

appreciate it!

[Zedna]

Better to do painting in event WM_PAINT so your window will be correctly repainted also when other external overlapping window/application will move away from that position on top of your window.

Use: GUIRegisterMsg($WM_PAINT, 'MY_WM_PAINT')

Search this code on this forum for plenty of existing examples ...