GDIplus question

[sandin]

This is modified example for create GDI plus graphic, with added option to make imaged of it, but it always turn out black, why?

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

Opt('MustDeclareVars', 1)

_Main()

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

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

    ; 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)
    Local $hbitimage = _GDIPlus_BitmapCreateFromGraphics(400, 300, $hGraphic) ;<--- crate image (black?)
    _GDIPlus_ImageSaveToFile($hbitimage, @DesktopDir & "\temp_image.bmp")
    _WinAPI_DeleteObject($hbitimage)
    
    ; Loop until user exits
    Do
    Until GUIGetMsg() = $GUI_EVENT_CLOSE

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

EndFunc   ;==>_Main

[monoceres]

When you use _GDIPlus_BitmapCreateFromGraphics it doesn't mean that the content in the Graphics object are copied to the bitmap, the bitmap only gets the same format as the graphics object.

Easiest way to accomplish what you want is to use a simple double buffering structure.

I have posted a template here: http://www.autoitscript.com/forum/index.ph...mp;#entry617017

And then use _GDIPlus_ImageSaveToFile($bitmap,"blah.png")

Edited January 7, 2009 by monoceres

[sandin]

thank you

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#include <GUIConstants.au3>
#include <GDIplus.au3>

HotKeySet("{F11}", "makeSS")

Global Const $width=600
Global Const $height=400
GLobal $title="GDI+"

; Build your GUI here
Opt("GUIOnEventMode",1)
$hwnd=GUICreate($title,$width,$height)
GUISetOnEvent($GUI_EVENT_CLOSE,"close")
GUISetState()

; Load your GDI+ resources here:
_GDIPlus_Startup()
$graphics=_GDIPlus_GraphicsCreateFromHWND($hwnd)
$bitmap=_GDIPlus_BitmapCreateFromGraphics($width,$height,$graphics)
$hBrush = _GDIPlus_BrushCreateSolid (0xFFFFFFFF);(0x2FB3E7FF)
$hFormat = _GDIPlus_StringFormatCreate ()
$hFamily = _GDIPlus_FontFamilyCreate ("Arial")
$hFont = _GDIPlus_FontCreate ($hFamily, 18, 2)
$backbuffer=_GDIPlus_ImageGetGraphicsContext($bitmap)
$txt = "something"
Do
    _GDIPlus_GraphicsClear($backbuffer)
    
    $tLayout = _GDIPlus_RectFCreate (1/$width+50, 1/$height+5, 0, 0)
    _GDIPlus_GraphicsDrawStringEx ($backbuffer, $txt, $hFont, $tLayout, $hFormat, $hBrush)
    
    _GDIPlus_GraphicsDrawImageRect($graphics,$bitmap,0,0,$width,$height)
    Sleep(10)
Until False

Func makeSS()
    _GDIPlus_ImageSaveToFile($bitmap, @DesktopDir & "\blah.png")
    ConsoleWrite("SS made" & @CRLF)
EndFunc

Func close()
    _GDIPlus_GraphicsDispose($backbuffer)
    _GDIPlus_BitmapDispose($bitmap)
    _GDIPlus_GraphicsDispose($graphics)
    _GDIPlus_Shutdown()
    Exit
EndFunc

Edited January 7, 2009 by sandin