Some questions about GDI+ use

[charvi]

Hello there,

Are there some rules we need to know about GDI+ used in AutoIt ?

GDI+ functions are put between _GDIPlus_Startup() and _GDIPlus_Shutdown(). Is this correct ?

Can we add later other GDI+ elements in the same $Pic handle after a _GDIPlus_Shutdown() has been done? or do we need to leave it open, as long as the program will add more elements later?

Is there a GDI+ tutorial somewhere in the AutoIt environment?

[PsaltyDS]

Hello there,

Are there some rules we need to know about GDI+ used in AutoIt ?

GDI+ functions are put between _GDIPlus_Startup() and _GDIPlus_Shutdown(). Is this correct ?

Can we add later other GDI+ elements in the same $Pic handle after a _GDIPlus_Shutdown() has been done? or do we need to leave it open, as long as the program will add more elements later?

Is there a GDI+ tutorial somewhere in the AutoIt environment?

I think you can get a reference to it again later with _GDIPlus_GraphicsCreateFromHDC() or _GDIPlus_GraphicsCreateFromHwnd().

[charvi]

Thank you PsaltyDS, I then looked for the _GDIPlus_GraphicsCreateFromHwnd() example, and it seems to work well.

I was asking that because I would like to write separate functions that will each open and close a GDI+ session on a common handle.

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#include <GuiConstantsEx.au3>
#include <GDIPlus.au3>

Opt('MustDeclareVars', 1)

Global $hGUI, $hWnd

; Create GUI
$hGUI = GUICreate("GDI+", 400, 300)
$hWnd = WinGetHandle("GDI+")
GUISetState()
    
_First($hGUI, $hWnd)
_Second($hGUI, $hWnd)

; Loop until user exits
Do
Until GUIGetMsg() = $GUI_EVENT_CLOSE

Func _First($hGUI, $hWnd)
    Local $hGraphic, $hBrush, $hFormat, $hFamily, $hFont, $tLayout

    ; Draw a string
    _GDIPlus_Startup ()
    $hGraphic = _GDIPlus_GraphicsCreateFromHWND ($hWnd)
    $hBrush = _GDIPlus_BrushCreateSolid (0x7F00007F)
    $hFormat = _GDIPlus_StringFormatCreate ()
    $hFamily = _GDIPlus_FontFamilyCreate ("Arial")
    $hFont = _GDIPlus_FontCreate ($hFamily, 12, 2)
    $tLayout = _GDIPlus_RectFCreate (140, 110, 100, 20)
    _GDIPlus_GraphicsDrawStringEx ($hGraphic, "Hello world", $hFont, $tLayout, $hFormat, $hBrush)

    ; Clean up resources
    _GDIPlus_FontDispose ($hFont)
    _GDIPlus_FontFamilyDispose ($hFamily)
    _GDIPlus_StringFormatDispose ($hFormat)
    _GDIPlus_BrushDispose ($hBrush)
    _GDIPlus_GraphicsDispose ($hGraphic)
    _GDIPlus_Shutdown ()

EndFunc   ;==>_First

Func _Second($hGUI, $hWnd)
    Local $hGraphic, $hBrush, $hFormat, $hFamily, $hFont, $tLayout

    ; Draw a string
    _GDIPlus_Startup ()
    $hGraphic = _GDIPlus_GraphicsCreateFromHWND ($hWnd)
    $hBrush = _GDIPlus_BrushCreateSolid (0x7F00007F)
    $hFormat = _GDIPlus_StringFormatCreate ()
    $hFamily = _GDIPlus_FontFamilyCreate ("Arial")
    $hFont = _GDIPlus_FontCreate ($hFamily, 12, 2)
    $tLayout = _GDIPlus_RectFCreate (140, 150, 100, 20)
    _GDIPlus_GraphicsDrawStringEx ($hGraphic, "Hello world", $hFont, $tLayout, $hFormat, $hBrush)

    ; Clean up resources
    _GDIPlus_FontDispose ($hFont)
    _GDIPlus_FontFamilyDispose ($hFamily)
    _GDIPlus_StringFormatDispose ($hFormat)
    _GDIPlus_BrushDispose ($hBrush)
    _GDIPlus_GraphicsDispose ($hGraphic)
    _GDIPlus_Shutdown ()

EndFunc   ;==>_Second