GDIPlus disappearing after a ScreenSaver

[charvi]

Hello,

If you have an active ScreenSaver, resuming the screen will not redraw the GDIPlus elements - if drawn on a picture at least. Is this normal? How to avoid this behaviour?

This is a snippet of the code that does not reappear:

$h_Wnd = WinGetHandle($h_Win)
    GUISetState()
    _GDIPlus_Startup()
    $h_Graph2 = _GDIPlus_GraphicsCreateFromHWND($h_Wnd)
    $h_Pen = _GDIPlus_PenCreate()
    _GDIPlus_PenSetColor($h_Pen, 0xff838b83)
    _GDIPlus_GraphicsDrawRect($h_Graph2, 5, 62, $ci_ScreenW-10, $ci_ProgramBodyH-68, $h_Pen)
    _GDIPlus_PenDispose($h_Pen)
    _GDIPlus_GraphicsDispose($h_Graph2)
    _GDIPlus_Shutdown()

[ProgAndy]

yes, this is normal. to save it, you have to zse the UDF _setimage or redraw on WM_PAINT

[charvi]

yes, this is normal. to save it, you have to zse the UDF _setimage or redraw on WM_PAINT

Ah, OK, but I'm not sure how to do that with WM_PAINT or _setimage. Even when using Alt+Tab to toggle windows, they clear the GDI+ stuff. In my thoughts, screens must then be constantly redrawn - if we want to be sure we are not missing anything.

[charvi]

Never mind, I found it.

Zedna already told it to me how to draw on a picture, but I did not knew that it was keeping the drawings too. Ohmy, what does it become a bit more complex! It remains however easy when using discipline, that I will now share here:

First, create a window:

$h_Win = GUICreate("My window")

Then, put the pictures:

$h_Pic = GUICtrlCreatePic(@ScriptDir & "\image.jpg", 0, 0, 200, 150)

Then, write a block to draw the GDI elements:

; ## Special Painting with GDI+
$h_Wnd = WinGetHandle($h_Win)
_GDIPlus_Startup()
$h_Graph = _GDIPlus_GraphicsCreateFromHWND($h_Wnd)
GUIRegisterMsg($WM_PAINT, "MY_WM_PAINT")

Then, display everything:

GUISetState()

Then, when you leave the script, dispose the graphic elements and close the GDI:

_GDIPlus_PenDispose($h_Pen)
_GDIPlus_GraphicsDispose($h_Graph)
_GDIPlus_Shutdown()

Then, add a Func MY_WM_PAINT() with your drawings:

Func MY_WM_PAINT()
    _WinAPI_RedrawWindow($h_Pic_H, 0, 0, $RDW_UPDATENOW); force redraw of pic (Rect=0 Region=0)
; Below is my WM Paint =====================================================================
    $h_Pen = _GDIPlus_PenCreate()
    _GDIPlus_PenSetColor($h_Pen, 0xff838b83)
    _GDIPlus_GraphicsDrawRect($h_Graph, 5, 62, 200, 200, $h_Pen)
; End of my WM Paint =======================================================================
    _WinAPI_RedrawWindow($h_Pic_H, 0, 0, $RDW_VALIDATE); then force no-redraw of pic
    Return $GUI_RUNDEFMSG
EndFunc

I hope this will help those with volatile graphic elements!!