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1. Code the web wallpaper code#
2. Code the web wallpaper windows 7#
3. Code the web wallpaper download#
4. Code the web wallpaper windows#

(Detailed information on the function can be found here. This function retrieves or sets the value of one of the system-wide parameters and updates the user profile.

Code the web wallpaper code#

Img.Save(_imagePath, .Bmp) Ĭhanging the wallpaper is not accessible through managed code so I’ll be calling SystemParametersInfo from the Win32 API, as proposed by Sean Campbell, which is hosted on user32.dll. Stream s = new ().OpenRead(url.ToString()) / /// Uri url private static void DownloadImage(Uri url) / /// Downloads an image and saves it to a temp path _imagePath = Path.Combine(Path.GetTempPath(), " wallpaper.bmp")

Code the web wallpaper windows#

But to achieve compatibility with Windows XP system, I’m saving the image as a bitmap regardless of the system the application is running.

Code the web wallpaper windows 7#

With the method I’ll be using Windows 7 and newer versions support both BMPs and JPGs file formats for wallpapers. I will also change the image format and save it as a bitmap (BMP).

Code the web wallpaper download#

Once we have the image URL, we need to download it and store it on a temporal folder (you can change this folder to whatever you want). String _Response = responseStream.ReadToEnd() (webresponse.GetResponseStream(), Encoding.ASCII) StreamReader responseStream = new StreamReader HttpWebResponse webresponse = (HttpWebResponse)webrequest.GetResponse() WriteStream.Write(bytes, 0, bytes.Length) Using (Stream writeStream = webrequest.GetRequestStream())īyte bytes = (_Request) Webrequest.ContentLength = _Request.Length String _Request = BuildRequestBody(Items) Webrequest.ContentType = " application/x-www-form-urlencoded" HttpWebRequest webrequest = (HttpWebRequest)WebRequest.Create(Uri) / /// Site URL send the httprequest /// NameValueCollection with the data to send as post /// Image Url static string getImageUrl( string Uri, NameValueCollection Items) / /// Gets the image URL with an HTTPRequest I can change the image URL whenever I want or echo an empty string to avoid a change on the wallpaper.įor instance, hosted page would look as follows: To achieve this behavior, I’ll be hosting a web page with the URL of the desired image. However, since this is a prank, not only do I want to fully control the image that will be displaying but also when it will be displaying. We can provide a URL or a set of URLs to the image(s) we want to display. We can either provide the path to an image we already have stored. Getting the Image to DisplayĪs a first step, we need to choose the image we want to display as new wallpaper. But mainly, I’ll be using the method described by Sean Campbell in his article Setting Wallpaper (link to the article provided below). Next, I’ll be discussing different approaches to achieve the automation and periodical repetition of changing the computer’s wallpaper.įor the section about setting the wallpaper, I’ll be using documentation from other sites (which you can find at the end of this article, in the reference section).

In this article, I’ll be using C# and calling Win32 APIs to change the computer’s wallpaper. There are quite a few articles around the web about changing a computer’s wallpaper describing the steps and providing sample code to achieve it. But, what if we could automate the process of changing someone else’s wallpaper? Furthermore, what if we could have a background process making the change whenever we want. When the owner of the computer comes back, he knows that he forgot to lock the computer and also has a good time laughing about the prank. If someone forgets to lock his/her computer, as part of the policy we have agreed, the remaining coworkers can make changes to the computer’s settings (typically changing the desktop wallpaper). In our office, we have established the policy to lock our computer (Windows key + L) when we are away from it.