i have some troubles with WM_PAINT work on tabs (it wont redraw pic on tab item change) and also with resetting image place holder to default colour before drawing new pic in to it (previous pic can be seen if it aspect ratio is different from new)...
#AutoIt3Wrapper_Version=Beta
#include <File.au3>
#include <Array.au3>
#include <GuiListBox.au3>
#include <GDIPlus.au3>
#include <WinAPIGdi.au3>
#include <WinAPI.au3>
#include <ButtonConstants.au3>
#include <ComboConstants.au3>
#include <GUIConstantsEx.au3>
#include <GUIListBox.au3>
#include <GuiStatusBar.au3>
#include <StaticConstants.au3>
#include <TabConstants.au3>
#include <WindowsConstants.au3>
Global $hBitmap_Scaled, $hGraphics
#Region ### START Koda GUI section ### Form=
$ChoiserGUI = GUICreate("Choiser GUI", 623, 449, 192, 114)
$Tab1 = GUICtrlCreateTab(8, 32, 609, 385)
$TabSheet1 = GUICtrlCreateTabItem("first tab")
$Group1 = GUICtrlCreateGroup("Selector", 16, 64, 329, 193)
GUICtrlCreateGroup("", -99, -99, 1, 1)
$Group2 = GUICtrlCreateGroup("Prewiev", 352, 64, 257, 313)
Global $aPrewievPic[4] = [360, 80, 244, 292]
$PrewievPic = GUICtrlCreatePic("", 360, 80, 244, 292, BitOR($GUI_SS_DEFAULT_PIC,$WS_BORDER), BitOR($WS_EX_CLIENTEDGE,$WS_EX_STATICEDGE,$GUI_WS_EX_PARENTDRAG))
GUICtrlCreateGroup("", -99, -99, 1, 1)
$Group3 = GUICtrlCreateGroup("Choise", 16, 264, 329, 113)
GUICtrlCreateGroup("", -99, -99, 1, 1)
$Button_Next = GUICtrlCreateButton("Next", 456, 384, 75, 25)
$TabSheet2 = GUICtrlCreateTabItem("second tab")
$TabSheet3 = GUICtrlCreateTabItem("third tab")
GUICtrlCreateTabItem("")
$StatusBar1 = _GUICtrlStatusBar_Create($ChoiserGUI)
GUIRegisterMsg($WM_PAINT,"WM_PAINT_PrewievPic")
GUISetState(@SW_SHOW)
#EndRegion ### END Koda GUI section ###
_GDIPlus_Startup()
$hDC = _WinAPI_GetDC ( $ChoiserGUI )
$BkColor = _WinAPI_GetBkColor ( $hDC )
ConsoleWrite($BkColor&@crlf)
_WinAPI_ReleaseDC($ChoiserGUI, $hDC)
$hBrush = _GDIPlus_BrushCreateSolid($BkColor)
Global $hImage, $hBitmap_Scaled, $hGraphics
$sSourceFolder = "C:\WINDOWS"
$picExtentions = "*.jpeg;*.jpg;*.png;*.tiff;*.tif;*.gif;*.tga;*.bmp;*.pcx;*.jpe;*.jif;*.jfif;*.jfi;*.dib;*.tpic"
$fl = _FileListToArrayRec($sSourceFolder,$picExtentions,Default,Default,Default, 2 )
$spath = $fl[Random(1,$fl[0],1)]
QQQ
($spath)
While 1
$nMsg = GUIGetMsg()
Switch $nMsg
Case $GUI_EVENT_CLOSE
_GDIPlus_Shutdown()
Exit
Case $Button_Next
QQQ
($fl[Random(1,$fl[0],1)])
EndSwitch
WEnd
Func QQQ
($spath)
Local $iW, $iH, $iAspect, $iAspectFrame, $iH_new, $iW_new
_GDIPlus_BitmapDispose($hImage)
_GDIPlus_BitmapDispose($hBitmap_Scaled)
$hImage = _GDIPlus_ImageLoadFromFile($spath)
$iW = _GDIPlus_ImageGetWidth($hImage)
$iH = _GDIPlus_ImageGetHeight($hImage)
$iAspect = $iW/$iH
$iAspectFrame = $aPrewievPic[2]/$aPrewievPic[3]
Select
Case $iAspectFrame >= $iAspect
$iH_new = $aPrewievPic[3]
$iW_new = $iH_new*$iAspect
Case $iAspectFrame < $iAspect
$iW_new = $aPrewievPic[2]
$iH_new = $iW_new/$iAspect
EndSelect
$hBitmap_Scaled = _GDIPlus_ImageResize($hImage, $iW_new-8, $iH_new-8)
$hGraphics = _GDIPlus_GraphicsCreateFromHWND($ChoiserGUI)
_GDIPlus_GraphicsFillRect($hGraphics, $aPrewievPic[0]+4, $aPrewievPic[1]+4, $aPrewievPic[2]-8, $aPrewievPic[3]-8, $hBrush)
_GDIPlus_GraphicsDrawImage($hGraphics, $hBitmap_Scaled, $aPrewievPic[0]+4, $aPrewievPic[1]+4)
EndFunc
Func WM
_PAINT
_PrewievPic
($hWnd,$wParam,$lParam)
#forceref $hWnd,$wParam,$lParam
_GDIPlus_GraphicsDrawImage($hGraphics, $hBitmap_Scaled, $aPrewievPic[0]+4, $aPrewievPic[1]+4)
Return $GUI_RUNDEFMSG
EndFunc