c# - C# 更改桌面模式

Question

我正在制作一个简单的壁纸更换器。它在更换壁纸时有效，但我无法更改壁纸的图案。我试过这样的东西，但它不起作用：S

SystemParametersInfo(SPI_SETDESKPATTERN, 0, "Center",
SPIF_UPDATEINIFILE | SPIF_SENDWININICHANGE);

有人可以告诉我设置壁纸图案的正确方法吗？

Answer 1

我假设您的意思是居中/拉伸/平铺设置，这将是第二个过去值 int 1-3

[DllImport("user32.dll", CharSet = CharSet.Auto)]
        private static extern Int32 SystemParametersInfo(UInt32 action, UInt32 uParam, String vParam, UInt32 winIni);
        private static readonly UInt32 SPI_SETDESKWALLPAPER = 0x14;
        private static readonly UInt32 SPIF_UPDATEINIFILE = 0x01;
        private static readonly UInt32 SPIF_SENDWININICHANGE = 0x02;

        private void SetWallpaper(string path)
        {
            if (File.Exists(path))
            {
                Image imgInFile = Image.FromFile(path);
                try
                {
                    imgInFile.Save(SaveFile, ImageFormat.Bmp);
                    SystemParametersInfo(SPI_SETDESKWALLPAPER, 3, SaveFile, SPIF_UPDATEINIFILE | SPIF_SENDWININICHANGE);
                }
                catch
                {
                    MessageBox.Show("error in setting the wallpaper");
                }
                finally
                {
                    imgInFile.Dispose();
                }
            }
        }