Question

我希望使用C＃为Windows XP设置壁纸。我已经开发了代码，因此它在Windows 7中完美运行，但显然它与XP不同。我将壁纸添加为资源，将其编译操作设置为内容并始终复制。奇怪的是，它在桌面属性对话框中设置了正确的墙纸名称。但是，壁纸未设置。我的代码如下所示：

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(string wpaper, Style style)
    {
        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());
        }

        string tempPath = "Resources\\"+wpaper;
        SystemParametersInfo(SPI_SETDESKWALLPAPER,
            0,
            tempPath,
            SPIF_UPDATEINIFILE | SPIF_SENDWININICHANGE);
    }
}

当调用Wallpaper.Set（“wpapername”）时，它从项目资源中获取壁纸。它适用于Win7，但不适用于WinXP。我做错了吗？

Answer 1

嗯，这有点尴尬，但我会回答我自己的问题。

我不得不重复使用接受的答案here中的更多代码。基本上XP中的问题是它需要使用bmp文件，所以我设法使用前面的例子和一些调整将项目资源转换为bmp文件。 Set方法以这种方式完美运行：

public static void Set(string wpaper, Style style)
{
    using(System.Drawing.Image img = System.Drawing.Image.FromFile(Path.GetFullPath(wpaper)))
    {
        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);

}

重要的部分是在这段代码的第三行（System.Drawing.Image.FromFile(Path.GetFullPath(wpaper));）。

Answer 2

获得良好可靠的解决方案。

将foillowing类添加到项目中

using Microsoft.Win32;
using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Runtime.InteropServices;

namespace XXXNAMESPACEXXX
{
    public class Wallpaper
    {
        public enum Style : int
        {
            Tiled,
            Centered,
            Stretched
        }

        [DllImport("user32.dll")]
        public static extern Int32 SystemParametersInfo(UInt32 action, UInt32 uParam, String vParam, UInt32 winIni);

        public static readonly UInt32 SPI_SETDESKWALLPAPER = 0x14;
        public static readonly UInt32 SPIF_UPDATEINIFILE = 0x01;
        public static readonly UInt32 SPIF_SENDWININICHANGE = 0x02;

        public static bool Set(string filePath, Style style)
        {
            bool Success = false;
            try
            {
                Image i = System.Drawing.Image.FromFile(Path.GetFullPath(filePath));

                Set(i, style);

                Success = true;

            }
            catch //(Exception ex)
            {
                //ex.HandleException();
            }
            return Success;
        }

        public static bool Set(Image image, Style style)
        {
            bool Success = false;
            try
            {
                string TempPath = Path.Combine(Path.GetTempPath(), "wallpaper.bmp");

                image.Save(TempPath, ImageFormat.Bmp);

                RegistryKey key = Registry.CurrentUser.OpenSubKey(@"Control Panel\Desktop", true);

                switch (style)
                {
                    case Style.Stretched:
                        key.SetValue(@"WallpaperStyle", 2.ToString());

                        key.SetValue(@"TileWallpaper", 0.ToString());

                        break;

                    case Style.Centered:
                        key.SetValue(@"WallpaperStyle", 1.ToString());

                        key.SetValue(@"TileWallpaper", 0.ToString());

                        break;

                    default:
                    case Style.Tiled:
                        key.SetValue(@"WallpaperStyle", 1.ToString());

                        key.SetValue(@"TileWallpaper", 1.ToString());

                        break;

                }

                SystemParametersInfo(SPI_SETDESKWALLPAPER, 0, TempPath, SPIF_UPDATEINIFILE | SPIF_SENDWININICHANGE);

                Success = true;

            }
            catch //(Exception ex)
            {
                //ex.HandleException();
            }
            return Success;
        }

    }

}

注意：将XXXNAMESPACEXXX替换为项目的默认命名空间。

然后它可以像下面一样使用：

string FilePath = TxtFilePath.Text;

Wallpaper.Set(FilePath, Wallpaper.Style.Centered);

它也可以像这样使用：

if(Wallpaper.Set(FilePath, Wallpaper.Style.Centered))
{
    MessageBox.Show("Your wallpaper has been set to " + FilePath);

}
else
{
    MessageBox.Show("There was a problem setting the wallpaper.");

}

这适用于Windows XP，7,8,8.1和Windows 10。

注意值得注意的是，此方法将绕过网络管理员应用的任何桌面壁纸安全限制。

如何以编程方式更改Windows桌面墙纸？

2 个答案: