c# - 适合/填充图像？

Question

我正在制作一个简单的程序来更改我的计算机背景。我在网上发现了一个stackoverflow问题，或多或少涵盖了我想做的事情。我现在可以成功地将我的墙纸更改为平铺、居中和从在线图像 URL 拉伸(stretch)。但是，在控制面板中，可以选择将墙纸置于“适合”和“填充”位置。如何以编程方式将墙纸设置为适合/填充模式？

相关代码:

public enum Style : int
{
    Tiled,
    Centered,
    Stretched
}
public class Wallpaper
{
    public 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 void Set(string URL, Style style)
    {
        HttpWebRequest httpWebRequest = (HttpWebRequest)HttpWebRequest.Create(URL);
        HttpWebResponse httpWebReponse = (HttpWebResponse)httpWebRequest.GetResponse();
        Stream stream = httpWebReponse.GetResponseStream();
        System.Drawing.Image img = Image.FromStream(stream);

        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);
    }
}

fit/fill 键不可用吗？在网上查了一会儿，只找到平铺的、居中的、拉伸(stretch)的。

Answer 1

这可能对你有帮助。

摘自 Set the desktop wallpaper

   case WallpaperStyle.Fit: // (Windows 7 and later)
       key.SetValue(@"WallpaperStyle", "6");
       key.SetValue(@"TileWallpaper", "0");
       break;
   case WallpaperStyle.Fill: // (Windows 7 and later)
       key.SetValue(@"WallpaperStyle", "10");
       key.SetValue(@"TileWallpaper", "0");
       break;

我相信您可以轻松地将其适应您的代码。