LoadBingPicture/SetDesktop.cs at main · mking2203/LoadBingPicture · GitHub

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//
// Mark König, 03/2022
//

using System;
using System.Windows.Forms;
using System.Runtime.InteropServices;
using Microsoft.Win32;

namespace LoadBingPicture
{
    public class SetDesktop
    {
        #region windows stuff

        [DllImport("user32.dll", SetLastError = true)]
        [return: MarshalAs(UnmanagedType.Bool)]
        static extern bool SystemParametersInfo(uint uiAction, uint uiParam, String pvParam, uint fWinIni);

        private const uint SPI_SETDESKWALLPAPER = 0x14;
        private const uint SPIF_UPDATEINIFILE = 0x1;
        private const uint SPIF_SENDWININICHANGE = 0x2;

        #endregion

        public enum DesktopStyle : int
        {
            Fill,
            Fit,
            Span,
            Stretch,
            Tile,
            Center
        }

        public static void DisplayPicture(string file_name, bool update_registry)
        {
            try
            {
                // If we should update the registry,
                // set the appropriate flags.
                uint flags = 0;
                if (update_registry)
                    flags = SPIF_UPDATEINIFILE | SPIF_SENDWININICHANGE;

                // Set the desktop background to this file.
                if (!SystemParametersInfo(SPI_SETDESKWALLPAPER,
                    0, file_name, flags))
                {
                    MessageBox.Show("SystemParametersInfo failed.",
                        "Error", MessageBoxButtons.OK,
                        MessageBoxIcon.Exclamation);
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show("Error displaying picture " +
                    file_name + ".\n" + ex.Message,
                    "Error", MessageBoxButtons.OK,
                    MessageBoxIcon.Exclamation);
            }
        }

        public static void SetKey(DesktopStyle style)
        {
            RegistryKey key = Registry.CurrentUser.OpenSubKey(@"Control Panel\Desktop", true);

            if (style == DesktopStyle.Fill)
            {
                key.SetValue(@"WallpaperStyle", 10.ToString());
                key.SetValue(@"TileWallpaper", 0.ToString());
            }
            if (style == DesktopStyle.Fit)
            {
                key.SetValue(@"WallpaperStyle", 6.ToString());
                key.SetValue(@"TileWallpaper", 0.ToString());
            }
            if (style == DesktopStyle.Span) // Windows 8 or newer only!
            {
                key.SetValue(@"WallpaperStyle", 22.ToString());
                key.SetValue(@"TileWallpaper", 0.ToString());
            }
            if (style == DesktopStyle.Stretch)
            {
                key.SetValue(@"WallpaperStyle", 2.ToString());
                key.SetValue(@"TileWallpaper", 0.ToString());
            }
            if (style == DesktopStyle.Tile)
            {
                key.SetValue(@"WallpaperStyle", 0.ToString());
                key.SetValue(@"TileWallpaper", 1.ToString());
            }
            if (style == DesktopStyle.Center)
            {
                key.SetValue(@"WallpaperStyle", 0.ToString());
                key.SetValue(@"TileWallpaper", 0.ToString());
            }
        }

    }
}