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copied!<p>Sorry I'm a bit behind @ataylor's answer because I was preparing a snippet to do it. Yes, JNA is a correct approach. Here you go:</p> <pre><code>import java.util.HashMap; import com.sun.jna.Native; import com.sun.jna.platform.win32.WinDef.UINT_PTR; import com.sun.jna.win32.*; public class WallpaperChanger { public static void main(String[] args) { //supply your own path instead of using this one String path = "C:\\Users\\Public\\Pictures\\Sample Pictures\\Chrysanthemum.jpg"; SPI.INSTANCE.SystemParametersInfo( new UINT_PTR(SPI.SPI_SETDESKWALLPAPER), new UINT_PTR(0), path, new UINT_PTR(SPI.SPIF_UPDATEINIFILE | SPI.SPIF_SENDWININICHANGE)); } public interface SPI extends StdCallLibrary { //from MSDN article long SPI_SETDESKWALLPAPER = 20; long SPIF_UPDATEINIFILE = 0x01; long SPIF_SENDWININICHANGE = 0x02; SPI INSTANCE = (SPI) Native.loadLibrary("user32", SPI.class, new HashMap<Object, Object>() { { put(OPTION_TYPE_MAPPER, W32APITypeMapper.UNICODE); put(OPTION_FUNCTION_MAPPER, W32APIFunctionMapper.UNICODE); } }); boolean SystemParametersInfo( UINT_PTR uiAction, UINT_PTR uiParam, String pvParam, UINT_PTR fWinIni ); } } </code></pre> <p>You need to have the JNA libraries on the classpath for this to work. This was tested in Windows 7, there might be some nuances in XP but I think it should work. That API is presumably stable.</p> <h2>References</h2> <ul> <li><a href="http://blogs.msdn.com/b/coding4fun/archive/2006/10/31/912569.aspx" rel="nofollow noreferrer">Setting Wallpaper - Coding4Fun</a></li> <li><a href="https://stackoverflow.com/questions/2057492/how-to-determine-if-a-screensaver-is-running-in-java">How to determine if a screensaver is running in Java?</a></li> <li><a href="http://www.koders.com/java/fidFD72484D3A2451C9E8B017577D085D8C95154A35.aspx" rel="nofollow noreferrer">W32API.java</a></li> </ul> <h2>Edit (2010/01/20):</h2> <p>I had previously omitted the options <code>SPIF_UPDATEINIFILE</code> and <code>SPIF_SENDWININICHANGE</code>. These are now being used as they were suggested in the Coding4Fun MSDN article.</p>

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