How do I set the desktop background to automatically change every so often?

I had my desktop background set to change every five seconds, with the photos coming from a folder in my iPhoto files. I then made a new folder of background pictures in iPhoto, but when I switched to them and tried to make it "change every 5 seconds", or 1 minute etc., it would not change. I then reverted back to the original group of files and it STILL wouldn't change, even though it had been doing so for the many months that I had been using this set of background photos before.
I have clicked on "change every 5 seconds" and "random order", but for some reason I can now only change the pictures manually by clicking on them in the right hand pane of the system preferences window. Please can someone tell me how to make them change automatically again...?

Have you tried restarting your computer and attempting it again?
Sorry if this is a dumb question, but a lot of people run their machines 24/7 and sometimes a little reboot helps.

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UPDATE:
I found the solution that addressed my problem, which I posted in a post below. Keeping the original post for Internet historical reasons as I the hope this helps someone else later on in their search for a solution.
===============
I have Bing'ed and I have Google'd and I haven't found a solid answer to setting the desktop wallpaper programmically. I am trying to do this via PowerShell, but I would be happy for any other language flavor or application to work.
Below is the code I have tried to set the desktop background image. This has been scrounged from a few sources across the web. This solution works 25% of the time and I haven't figured out what the cause for success or failure of the execution. Or maybe
it's neither, but waiting for Explorer to refresh. The only way to see the change 100% is to log out and log back in.
I am running Windows 8.1 btw.
Thank you for looking.
Function Get-WallPaper()
$wp=Get-ItemProperty -path 'HKCU:\Control Panel\Desktop\' -name wallpaper
if(!$wp.WallPaper)
{ "Wall paper is not set" }
Else
{"Wall paper is set to $($wp.WallPaper)" }
Function Refresh-Explorer {
$code = @'
private static readonly IntPtr HWND_BROADCAST = new IntPtr(0xffff);
private const int WM_SETTINGCHANGE = 0x1a;
private const int SMTO_ABORTIFHUNG = 0x0002;
[System.Runtime.InteropServices.DllImport("user32.dll", SetLastError=true, CharSet=CharSet.Auto)]
static extern bool SendNotifyMessage(IntPtr hWnd, uint Msg, UIntPtr wParam,
IntPtr lParam);
[System.Runtime.InteropServices.DllImport("user32.dll", SetLastError = true)]
private static extern IntPtr SendMessageTimeout ( IntPtr hWnd, int Msg, IntPtr wParam, string lParam, uint fuFlags, uint uTimeout, IntPtr lpdwResult );
[System.Runtime.InteropServices.DllImport("Shell32.dll")]
private static extern int SHChangeNotify(int eventId, int flags, IntPtr item1, IntPtr item2);
public static void Refresh() {
SHChangeNotify(0x8000000, 0x1000, IntPtr.Zero, IntPtr.Zero);
SendMessageTimeout(HWND_BROADCAST, WM_SETTINGCHANGE, IntPtr.Zero, null, SMTO_ABORTIFHUNG, 100, IntPtr.Zero);
Add-Type -MemberDefinition $code -Namespace MyWinAPI -Name Explorer
[MyWinAPI.Explorer]::Refresh()
Function Set-WallPaper($Value)
echo "Setting background to: $value"
Refresh-Explorer
Set-ItemProperty -path 'HKCU:\Control Panel\Desktop\' -name wallpaper -value $value
rundll32.exe user32.dll, UpdatePerUserSystemParameters
#sleep 1
rundll32.exe user32.dll, UpdatePerUserSystemParameters
#sleep 1
rundll32.exe user32.dll, UpdatePerUserSystemParameters
#sleep 1
Refresh-Explorer
#Stop-Process -ProcessName explorer
NOTE: I left in a few commented out statements. I found that they do not offer any help in formulating a solution.
Thank you.

Great news! I found the solution and all props and credit goes to
jsd1982 of the XKCD comic
forum from a post he made in 2007 and some deep search kung-fu Googling on my part. Here is the
direct link to the post.
This solution has worked for me 100% of the time on Windows 8. The only gotcha I found (minor detail) was when setting this process to run as a scheduled task, I had to run it as elevated privileges for the code to compile in memory. Running this function
from PowerShell at the command prompt was fine.
NOTE: The code below is a slight trimmed down version posted by jsd1982 to just set the desktop wallpaper. I removed the image fetching from the Internet and the color inversion.
# Credit to jsd1982
function Compile-Csharp ([string] $code, $FrameworkVersion="v2.0.50727",
[Array]$References)
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$cp = new-object Microsoft.CSharp.CSharpCodeProvider
# Build up a compiler params object...
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$refs = new-object Collections.ArrayList
$refs.AddRange( @("${framework}\System.dll",
# "${mshhome}\System.Management.Automation.dll",
# "${mshhome}\System.Management.Automation.ConsoleHost.dll",
"${framework}\system.windows.forms.dll",
"${framework}\System.data.dll",
"${framework}\System.Drawing.dll",
"${framework}\System.Xml.dll"))
if ($references.Count -ge 1)
$refs.AddRange($References)
$cpar = New-Object System.CodeDom.Compiler.CompilerParameters
$cpar.GenerateInMemory = $true
$cpar.GenerateExecutable = $false
$cpar.CompilerOptions = "/unsafe";
$cpar.OutputAssembly = "custom"
$cpar.ReferencedAssemblies.AddRange($refs)
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if ( $cr.Errors.Count)
$codeLines = $code.Split("`n");
foreach ($ce in $cr.Errors)
write-host "Error: $($codeLines[$($ce.Line - 1)])"
$ce |out-default
Throw "INVALID DATA: Errors encountered while compiling code"
[System.Reflection.Assembly]::LoadWithPartialName("System.Drawing") > $null
[System.Reflection.Assembly]::LoadWithPartialName("System.Runtime") > $null
# C# code to post to wallpaper
$code = @'
using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.Runtime.InteropServices;
using System.IO;
using System.Net;
using Microsoft.Win32;
namespace test
public class Wallpaper
const int SPI_SETDESKWALLPAPER = 20 ;
const int SPIF_UPDATEINIFILE = 0x01;
const int SPIF_SENDWININICHANGE = 0x02;
[DllImport("user32.dll", CharSet=CharSet.Auto)]
static extern int SystemParametersInfo (int uAction , int uParam , string lpvParam , int fuWinIni) ;
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System.IO.Stream s = new WebClient().OpenRead(uri);
Image img = System.Drawing.Image.FromStream(s);
Bitmap copy = new Bitmap(img.Width, img.Height);
Graphics g = Graphics.FromImage(copy);
Rectangle rect = new Rectangle(0, 0, img.Width, img.Height);
g.DrawImage(img, rect, 0, 0, img.Width, img.Height, GraphicsUnit.Pixel);
g.Dispose();
img.Dispose();
// Save to a temp file:
string tempPath = Path.Combine(Path.GetTempPath(), "wallpaper.bmp");
copy.Save(tempPath, System.Drawing.Imaging.ImageFormat.Bmp);
RegistryKey key = Registry.CurrentUser.OpenSubKey( @"Control Panel\Desktop", true ) ;
key.SetValue(@"WallpaperStyle", 1.ToString( ) ) ;
key.SetValue(@"TileWallpaper", 0.ToString( ) ) ;
SystemParametersInfo( SPI_SETDESKWALLPAPER,
0,
tempPath,
SPIF_UPDATEINIFILE | SPIF_SENDWININICHANGE );
function Set-Wallpaper([string] $imgurl)
compile-CSharp $code
[test.Wallpaper]::SetWallpaper($imgurl)

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Introduction
Per Books Online:
http://msdn.microsoft.com/en-us/library/ms189595.aspx
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Also, we can go to the following registry to specify the DAC port number manually:
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HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft SQL Server\MSSQL11.MSSQLSERVER\MSSQLServer\SuperSocketNetLib\AdminConnection\Tcp
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name
local_tcp_port
Dedicated Admin Connection 5555
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DAC port will not change even SQL Server service is restarted only if the TCP port is available.
More Information
http://msdn.microsoft.com/en-us/library/ms189595.aspx
Applies to
SQL Server 2012
Please click to vote if the post helps you. This can be beneficial to other community members reading the thread.

I tested your script after
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SELECT name,local_tcp_port FROM sys.dm_exec_connections ec
join sys.endpoints e
on (ec.endpoint_id=e.endpoint_id)
WHERE e.name='Dedicated Admin Connection'
name local_tcp_port
Dedicated Admin Connection 1434
Kalman Toth Database & OLAP Architect
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New Book / Kindle: Exam 70-461 Bootcamp: Querying Microsoft SQL Server 2012

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