Тонкий ответ Нила Н для гифок:
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();
}
Также обратите внимание, что вам нужно использовать:
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;
Наконец, щелкните правой кнопкой мыши свой проект, добавьте ссылку и (в сборках и платформе) добавьте Presentation Core, System.Xaml и WindowsBase.
Затем щелкните правой кнопкой мыши свой проект и перейдите в Свойства, и убедитесь, что Target Framework - это .Net Framework 4.5. Если вы измените это, вам может потребоваться перезапустить Visual Studio.