使用.NET 中的代码更改桌面壁纸

如何使用 C # 代码更改桌面壁纸？

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最佳答案

这是我一两年前写的一个应用程序里的一门课:

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);
}
}

我还没有做过广泛的测试，所以使用风险自负。

小开

调整 Neal N 对 Gifs 的回答:

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();
}

还要注意你需要使用:

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，并(在程序集和框架中)添加演示核心、 System.Xaml 和 WindowsBase。

然后右键单击您的项目，进入属性，并确保目标框架是。Net Framework 4.5.如果更改此属性，则可能需要重新启动 VisualStudio。

小开

基于 这个有用的答案，我也使 我自己的应用设置壁纸匹配屏幕分辨率。

但是注册表设置错误。下面是正确的值(在 Win 7，Win 8.1，Win 10上测试)。

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());
}
小开

如果您在 c # 中使用 UWP，下面是我找到的 给你代码

using Windows.System.UserProfile;


// Pass in a relative path to a file inside the local appdata folder
async Task<bool> SetWallpaperAsync(string localAppDataFileName)
{
bool success = false;
if (UserProfilePersonalizationSettings.IsSupported())
{
var uri = new Uri("ms-appx:///Local/" + localAppDataFileName);
StorageFile file = await StorageFile.GetFileFromApplicationUriAsync(uri);
UserProfilePersonalizationSettings profileSettings = UserProfilePersonalizationSettings.Current;
success = await profileSettings.TrySetWallpaperImageAsync(file);
}
}

其实我觉得还可以更简单 Png 是你的照片，它可以是. jpg 或者别的什么

StorageFile file = await ApplicationData.Current.LocalFolder.CreateFileAsync("file.png", CreationCollisionOption.ReplaceExisting);
bool success = false;
UserProfilePersonalizationSettings profileSettings = UserProfilePersonalizationSettings.Current;
success = await profileSettings.TrySetWallpaperImageAsync(file);
小开

如果你想在不污染 Windows 设置历史的情况下临时设置桌面壁纸，这里有一个我提出的要点。

它在设置临时壁纸之前备份 壁纸历史(存储在注册表中) ，然后您可以恢复它。

Https://gist.github.com/drarig29/4aa001074826f7da69b5bb73a83ccd39


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