使用.NET中的代码更改桌面壁纸
如何使用C＃代码更改桌面墙纸？
这是一个从一年或两年前编写的应用程序中抽出的类：
public sealed class Wallpaper { 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); public enum Style : int { Tiled, Centered, Stretched } public static void Set(Uri uri, Style style) { System.IO.Stream s = new System.Net.WebClient().OpenRead(uri.ToString()); System.Drawing.Image img = System.Drawing.Image.FromStream(s); string tempPath = Path.Combine(Path.GetTempPath(), "wallpaper.bmp"); img.Save(tempPath, System.Drawing.Imaging.ImageFormat.Bmp); RegistryKey key = Registry.CurrentUser.OpenSubKey(@"Control Panel\Desktop", true); if (style == Style.Stretched) { key.SetValue(@"WallpaperStyle", 2.ToString()); key.SetValue(@"TileWallpaper", 0.ToString()); } if (style == Style.Centered) { key.SetValue(@"WallpaperStyle", 1.ToString()); key.SetValue(@"TileWallpaper", 0.ToString()); } if (style == Style.Tiled) { key.SetValue(@"WallpaperStyle", 1.ToString()); key.SetValue(@"TileWallpaper", 1.ToString()); } SystemParametersInfo(SPI_SETDESKWALLPAPER, 0, tempPath, SPIF_UPDATEINIFILE | SPIF_SENDWININICHANGE); } } 我没有广泛的testing，所以请自担风险。
基于这个有用的答案 ，我也做了我自己的应用程序来设置壁纸匹配屏幕分辨率。
但是registry设置是错误的。 这里是正确的值（在Win 7，Win 8.1，Win 10上testing）。
if (style == Style.Fill) { key.SetValue(@"WallpaperStyle", 10.ToString()); key.SetValue(@"TileWallpaper", 0.ToString()); } if (style == Style.Fit) { key.SetValue(@"WallpaperStyle", 6.ToString()); key.SetValue(@"TileWallpaper", 0.ToString()); } if (style == Style.Span) // Windows 8 or newer only! { key.SetValue(@"WallpaperStyle", 22.ToString()); key.SetValue(@"TileWallpaper", 0.ToString()); } if (style == Style.Stretch) { key.SetValue(@"WallpaperStyle", 2.ToString()); key.SetValue(@"TileWallpaper", 0.ToString()); } if (style == Style.Tile) { key.SetValue(@"WallpaperStyle", 0.ToString()); key.SetValue(@"TileWallpaper", 1.ToString()); } if (style == Style.Center) { key.SetValue(@"WallpaperStyle", 0.ToString()); key.SetValue(@"TileWallpaper", 0.ToString()); }
调整尼尔N的GIF答案：
private const int SPI_SETDESKWALLPAPER = 20; private const int SPIF_UPDATEINIFILE = 0x01; private const int SPIF_SENDWININICHANGE = 0x02; [DllImport("user32.dll", CharSet = CharSet.Auto)] private static extern int SystemParametersInfo(int uAction, int uParam, string lpvParam, int fuWinIni); public enum Style : int { Tiled, Centered, Stretched } /// <summary> /// Loops numFrames times, animating the desktop background as the given gif. /// Remember this will sorta bog down your computer, and probably isn't best to be running 24/7. /// If numFrames is negative this will loop forever /// </summary> /// <param name="gifPath">The gif to be animated</param> /// <param name="transparencyReplace">If the gif has transparency, it will be "replaced" with this color.</param> /// <param name="framesPerSecond">How many frames to play per second. This is a max: most likely it will be a little slower than this especially at first.</param> /// <param name="style">Whether to tile, center, or stretch each gif frame as it's played.</param> /// <param name="numFrames">The number of frames to play. If negative, this method will loop forever.</param> public static void SetDesktopBackgroundAsGifAsync(string gifPath, System.Drawing.Color transparencyReplace, int framesPerSecond, Style style, int numFrames) { Thread workerThread = new Thread(() => SetDesktopBackgroundAsGif(gifPath, transparencyReplace, framesPerSecond, style, numFrames)); workerThread.Start(); } /// <summary> /// Loops numFrames times, animating the desktop background as the given gif. /// Remember this will sorta bog down your computer, and probably isn't best to be running 24/7. /// If num frames is negative this will loop forever. //// <summary> /// <param name="gifPath">The gif to be animated</param> /// <param name="backgroundImage">Image to render the gif on top of (because of transparency)</param> /// <param name="framesPerSecond">How many frames to play per second. This is a max: most likely it will be a little slower than this.</param> /// <param name="style">Whether to tile, center, or stretch each gif frame as it's played.</param> /// <param name="numFrames">The number of frames to play. If negative, this method will loop forever.</param> public static void SetDesktopBackgroundAsGifAsync(string gifPath, System.Drawing.Image backgroundImage, int framesPerSecond, Style style, int numFrames) { Thread workerThread = new Thread(() => SetDesktopBackgroundAsGif(gifPath, backgroundImage, framesPerSecond, style, numFrames)); workerThread.Start(); } /// <summary> /// Loops numFrames times, animating the desktop background as the given gif. /// Remember this will sorta bog down your computer, and probably isn't best to be running 24/7. /// if numFrames is negative this will loop forever /// </summary> /// <param name="gifPath">The gif to be animated</param> /// <param name="transparencyReplace">If the gif has transparency, it will be "replaced" with this color.</param> /// <param name="framesPerSecond">How many frames to play per second. This is a max: most likely it will be a little slower than this.</param> /// <param name="style">Whether to tile, center, or stretch each gif frame as it's played.</param> /// <param name="numFrames">The number of frames to play. If negative, this method will loop forever.</param> public static void SetDesktopBackgroundAsGif(string gifPath, System.Drawing.Color transparencyReplace, int framesPerSecond, Style style, int numFrames) { if (!File.Exists(gifPath)) throw new Exception("Given gif: '" + gifPath + "' not found"); FileStream gifFile = new FileStream(gifPath, FileMode.Open); GifBitmapDecoder gifDecoder = new GifBitmapDecoder(gifFile, BitmapCreateOptions.PreservePixelFormat, BitmapCacheOption.OnLoad); if (gifDecoder.Frames.Count == 0) throw new Exception("No frames in given gif"); Bitmap backgroundImage = new Bitmap(gifDecoder.Frames[0].PixelWidth, gifDecoder.Frames[0].PixelHeight, System.Drawing.Imaging.PixelFormat.Format32bppArgb); using(Graphics g = Graphics.FromImage(backgroundImage)) { g.FillRectangle(new System.Drawing.SolidBrush(transparencyReplace), 0, 0, gifDecoder.Frames[0].PixelWidth, gifDecoder.Frames[0].PixelHeight); } gifFile.Close(); SetDesktopBackgroundAsGif(gifPath, backgroundImage, framesPerSecond, style, numFrames); } /// <summary> /// Loops infinitely, animating the desktop background as the given gif. /// Remember this will sorta bog down your computer, and probably isn't best to be running 24/7. /// </summary> /// <param name="gifPath">The gif to be animated</param> /// <param name="backgroundImage">Image to render the gif on top of (because of transparency)</param> /// <param name="framesPerSecond">How many frames to play per second. This is a max: most likely it will be a little slower than this.</param> /// <param name="style">Whether to tile, center, or stretch each gif frame as it's played.</param> /// <param name="numFrames">The number of frames to play. If negative, this method will loop forever.</param> private static void SetDesktopBackgroundAsGif(string gifPath, System.Drawing.Image backgroundImage, int framesPerSecond, Style style, int numFrames) { if (!File.Exists(gifPath)) throw new Exception("Given gif: '" + gifPath + "' not found"); FileStream gifFile = new FileStream(gifPath, FileMode.Open); GifBitmapDecoder gifDecoder = new GifBitmapDecoder(gifFile, BitmapCreateOptions.PreservePixelFormat, BitmapCacheOption.OnLoad); if (gifDecoder.Frames.Count == 0) throw new Exception("No frames in given gif"); Console.WriteLine("Saving frames to temporary files:"); int numFramesSoFar = 0; for (int i = 0; i < gifDecoder.Frames.Count; i++) { BitmapFrame gifFrame = gifDecoder.Frames[i]; PngBitmapEncoder pngEncoder = new PngBitmapEncoder(); pngEncoder.Frames.Add(gifFrame); MemoryStream pngStream = new MemoryStream(); pngEncoder.Save(pngStream); Image frameImage = Image.FromStream(pngStream); Bitmap bmp = new Bitmap(frameImage.Width, frameImage.Height, System.Drawing.Imaging.PixelFormat.Format32bppArgb); using (Graphics g = Graphics.FromImage(bmp)) { g.DrawImage(backgroundImage, 0, 0); g.DrawImageUnscaled(frameImage, 0, 0); } string tempPath = Path.Combine(Path.GetTempPath(), gifPath + i + ".bmp"); bmp.Save(tempPath, System.Drawing.Imaging.ImageFormat.Bmp); Console.WriteLine("Saved frame " + i); numFramesSoFar++; if (numFrames >= 0 && numFramesSoFar >= numFrames) break; } Console.WriteLine("Setting frames to desktop background at about " + framesPerSecond + " FPS"); // 1.0/... to convert to seconds per frame (instead of frames per second) // * 1000 to convert to milliseconds per frame // * 1000 to convert to microseconds per frame // * 10 to convert to 0.1s of microseconds per frame = 100s of nanoseconds per frame long ticksBetweenFrames = (long)Math.Round(1.0 / framesPerSecond) * 1000*1000*10; Stopwatch timer = new Stopwatch(); timer.Start(); numFramesSoFar = 0; while(numFrames < 0 || numFramesSoFar < numFrames) { for (int i = 0; i < gifDecoder.Frames.Count; i++) { // Sleep until we're at the desired frame rate, if needed. if(ticksBetweenFrames > timer.ElapsedTicks) Thread.Sleep(new TimeSpan(Math.Max(0, ticksBetweenFrames - timer.ElapsedTicks))); timer.Restart(); // From http://stackoverflow.com/a/1061682/2924421 string filePath = Path.Combine(Path.GetTempPath(), "wallpaper" + i + ".bmp"); RegistryKey key = Registry.CurrentUser.OpenSubKey(@"Control Panel\Desktop", true); if (style == Style.Stretched) { key.SetValue(@"WallpaperStyle", 2.ToString()); key.SetValue(@"TileWallpaper", 0.ToString()); } if (style == Style.Centered) { key.SetValue(@"WallpaperStyle", 1.ToString()); key.SetValue(@"TileWallpaper", 0.ToString()); } if (style == Style.Tiled) { key.SetValue(@"WallpaperStyle", 1.ToString()); key.SetValue(@"TileWallpaper", 1.ToString()); } SystemParametersInfo(SPI_SETDESKWALLPAPER, 0, filePath, SPIF_UPDATEINIFILE | SPIF_SENDWININICHANGE); numFramesSoFar++; if (numFrames >= 0 && numFramesSoFar >= numFrames) break; } } gifFile.Close(); }
另外请注意，您需要使用：
using Microsoft.Win32; using System; using System.Collections.Generic; using System.Diagnostics; using System.Drawing; using System.IO; using System.Linq; using System.Runtime.InteropServices; using System.Text; using System.Threading; using System.Threading.Tasks; using System.Windows.Media; using System.Windows.Media.Imaging;
最后，右键单击您的项目，添加引用，（在程序集和框架中）添加Presentation Core，System.Xaml和WindowsBase。
然后右键单击您的项目并进入属性，并确保目标框架是.Net Framework 4.5。 如果您更改此，您可能需要重新启动Visual Studio。
