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While looking for a way to change my desktop background of only my secondary monitor, I found a few simple solutions that are built into Windows. But when you look up how to do such with a slideshow... You only find programs that cost money. So, I set out to make it myself.This is a pretty basic program. It simply displays an image in the center of the screen (scaled to fit screen) and uses a black background.The program does allow mouse passthrough, though you can't drag and drop over it, so it wouldn't really work well if you have icons on your second monitor. #include <File.au3> #include <GUIConstants.au3> #include <GUIConstantsEx.au3> #include <WindowsConstants.au3> #include <StaticConstants.au3> #include <EditConstants.au3> #include <Misc.au3> #include <Array.au3> #include <GDIPlus.au3> ;User Changeable Variables ;======================================================================== $pictureFolder = "D:\Wallpapers" $changeTime = 5 ;Seconds Global $smWidth = 1600 Global $smHeight = 900 Global $monitorPosition = "Right" ;Global $monitorPosition = "Left" ;======================================================================== Global $imageList = _FileListToArray($pictureFolder) Global $imageCount = $imageList[0] Global $imageHeight, $imageWidth, $pHeight, $pWidth, $pic, $gdiPic _GDIPlus_Startup() OnAutoItExitRegister("CloseProgram") $GUIStyle = BitOR($WS_POPUP, $WS_VISIBLE, $HWND_BOTTOM) ;Popup, Visible, Window on Bottom $GUIStyleEx = BitOR($WS_EX_TRANSPARENT, $WS_EX_TOOLWINDOW) ;Allow Passthrough, Hide from Alt+Tab $Parent = WinGetHandle('Program Manager', '') ;Sets parent to the program manager, allowing you to right click the desktop If $monitorPosition = "Right" Then $GUI = GUICreate("Secondary Wallpaper", $smWidth, $smHeight, @DesktopWidth, 0, $GUIStyle, $GUIStyleEx, $Parent) Else $GUI = GUICreate("Secondary Wallpaper", $smWidth, $smHeight, (-1 * @DesktopWidth), 0, $GUIStyle, $GUIStyleEx, $Parent) EndIf GUISetBkColor(0, $GUI) _WinAPI_SetWindowPos($GUI, $HWND_BOTTOM, 0, 0, 0, 0, BitOR($SWP_NOACTIVATE, $SWP_NOMOVE, $SWP_NOSIZE, $SWP_SHOWWINDOW)) ;Forces window to bottom of screen WinSetTrans($GUI, '', 255) ;Sets Window Visible Transparency: Required for mouse passthrough ChangeImage() GUISetState(@SW_SHOW) ;Show GUI While 1 Sleep($changeTime * 1000) ChangeImage() WEnd Func ChangeImage() $picName = Random(1, $imageCount, 1) ;Get Dimensions of image GetDimensions($imageList[$picName]) $imageHeight = $pHeight $imageWidth = $pWidth ;Turn them all into integers. (Fixes glitch that caused some images to skip resizing) $imageHeight = Int($imageHeight) $imageWidth = Int($imageWidth) $smHeight = Int($smHeight) $smWidth = Int($smWidth) ;Adjust the image size ;----------------------------------------------- ;If the image is bigger than the screen, adjust it If $imageWidth > $smWidth = 1 Or $imageHeight > $smHeight = 1 Then ;Calculate Aspect Ratio of image $aspectRatioX = $smWidth / $imageWidth $aspectRatioY = $smHeight / $imageHeight If $aspectRatioX < $aspectRatioY Then $scaleFactor = $aspectRatioX Else $scaleFactor = $aspectRatioY EndIf $imageHeight = $imageHeight * $scaleFactor $imageWidth = $imageWidth * $scaleFactor ;Else ;Image is smaller/same size as monitor EndIf ;Calculate Center of monitor ;(Monitor size - image size) / 2 $smCenterX = ($smWidth - $imageWidth) / 2 $smCenterY = ($smHeight - $imageHeight) / 2 ;Resize the image $hHBmp = $pictureFolder & "\" & $imageList[$picName] $gdiPic = _GDIPlus_BitmapCreateFromFile($hHBmp) ;convert GDI bitmap to GDI+ bitmap _GDIPlus_BitmapDispose($pic) $pic = _GDIPlus_ImageResize($gdiPic, $imageWidth, $imageHeight) ;resize image _GDIPlus_BitmapDispose($gdiPic) GUISetBkColor(0, $GUI) Local $hGraphics = _GDIPlus_GraphicsCreateFromHWND($GUI) ;create a graphics object from a window handle $gdiPic = _GDIPlus_BitmapCreateFromFile($pictureFolder & "\" & $imageList[$picName]) _GDIPlus_GraphicsDrawImage($hGraphics, $pic, $smCenterX, $smCenterY) ;display scaled image _GDIPlus_GraphicsDispose($hGraphics) ;Garbage Cleanup EndFunc ;==>ChangeImage Func GetDimensions($picName) Local $prop, $dArray, $fileSize, $imageDimensionsGDI $path = $pictureFolder & "\" & $picName $fileSize = FileGetSize($path) ;Save information to registry for faster access. Compare size of picture to verify changes to picture If $fileSize <> RegRead("HKEY_CURRENT_USER\Software\Secondary Wallpaper\Pictures", $picName & " Size") Then ;File sizes do not match RegWrite("HKEY_CURRENT_USER\Software\Secondary Wallpaper\Pictures", $picName & " Size", "REG_SZ", $fileSize) $imageDimensionsGDI = _GDIPlus_ImageLoadFromFile($path) $pWidth = _GDIPlus_ImageGetWidth($imageDimensionsGDI) $pHeight = _GDIPlus_ImageGetHeight($imageDimensionsGDI) _GDIPlus_ImageDispose($imageDimensionsGDI) RegWrite("HKEY_CURRENT_USER\Software\Secondary Wallpaper\Pictures", $picName & " Width", "REG_SZ", $pWidth) RegWrite("HKEY_CURRENT_USER\Software\Secondary Wallpaper\Pictures", $picName & " Height", "REG_SZ", $pHeight) Else ;File sizes match $pWidth = RegRead("HKEY_CURRENT_USER\Software\Secondary Wallpaper\Pictures", $picName & " Width") $pHeight = RegRead("HKEY_CURRENT_USER\Software\Secondary Wallpaper\Pictures", $picName & " Height") If $pWidth = "-1" Or $pHeight = "-1" Then RegWrite("HKEY_CURRENT_USER\Software\Secondary Wallpaper\Pictures", $picName & " Size", "REG_SZ", $fileSize) $imageDimensionsGDI = _GDIPlus_ImageLoadFromFile($path) $pWidth = _GDIPlus_ImageGetWidth($imageDimensionsGDI) $pHeight = _GDIPlus_ImageGetHeight($imageDimensionsGDI) _GDIPlus_ImageDispose($imageDimensionsGDI) RegWrite("HKEY_CURRENT_USER\Software\Secondary Wallpaper\Pictures", $picName & " Width", "REG_SZ", $pWidth) RegWrite("HKEY_CURRENT_USER\Software\Secondary Wallpaper\Pictures", $picName & " Height", "REG_SZ", $pHeight) EndIf EndIf EndFunc ;==>GetDimensions Func CloseProgram() ;Garbage Cleanup _GDIPlus_GraphicsDispose($gdiPic) _GDIPlus_Shutdown() EndFunc ;==>CloseProgram Secondary Wallpaper.au3