/// <summary>
/// Return the number of screens
/// </summary>
/// <returns>Count of screens based on the wallpaper mode</returns>
internal static int GetScreenCount(MultiMonitorModes vMultiMonitorMode, WallpaperModes vWallpaperMode)
{
int screenCount;// = Screen.AllScreens.Length;
//set the screen count default
if (vMultiMonitorMode == MultiMonitorModes.DifferentOnAll && vWallpaperMode != WallpaperModes.Tile)
{
screenCount = Screen.AllScreens.Length;
}
else
{
screenCount = 1;
// modify screen count in these specific circumstances
switch (vWallpaperMode)
{
case WallpaperModes.None:
break;
case WallpaperModes.Centre:
break;
case WallpaperModes.FillWidth:
break;
case WallpaperModes.FillHeight:
break;
case WallpaperModes.Stretch:
break;
case WallpaperModes.Tile:
//screenCount = 1;
//screenCount = Screen.AllScreens.Length;
break;
case WallpaperModes.Span:
//screenCount = 1;
screenCount = Screen.AllScreens.Length; // Screen.AllScreens.Length;
break;
case WallpaperModes.LAWC:
screenCount = Screen.AllScreens.Length;
break;
default:
break;
}
}
return(screenCount);
}
/// <summary>
/// NOTES: https://code.msdn.microsoft.com/windowsapps/CSSetDesktopWallpaper-2107409c
/// https://stackoverflow.com/questions/1061678/change-desktop-wallpaper-using-code-in-net
/// </summary>
/// <param name="filename"></param>
/// <param name="style"></param>
/// <returns></returns>
internal static Boolean SetWallpaper(string filename, WallpaperModes style)
{
Boolean output;// = false;
RegistryKey key = Registry.CurrentUser.OpenSubKey("Control Panel\\Desktop", true);
switch (style)
{
case WallpaperModes.Tile:
//key.SetValue(@"WallpaperStyle", "0");
//key.SetValue(@"TileWallpaper", "1");
key.SetValue(@"WallpaperStyle", "0");
key.SetValue(@"TileWallpaper", "1");
//output = true;
break;
case WallpaperModes.Centre:
key.SetValue(@"WallpaperStyle", "0");
key.SetValue(@"TileWallpaper", "0");
//output = true;
break;
case WallpaperModes.Stretch:
key.SetValue(@"WallpaperStyle", "2");
key.SetValue(@"TileWallpaper", "0");
//output = true;
break;
case WallpaperModes.FillWidth:
key.SetValue(@"WallpaperStyle", "10"); //1
key.SetValue(@"TileWallpaper", "0");
//output = true;
break;
case WallpaperModes.FillHeight:
key.SetValue(@"WallpaperStyle", "6");
key.SetValue(@"TileWallpaper", "0");
//output = true;
break;
case WallpaperModes.Span:
key.SetValue(@"WallpaperStyle", "22");
key.SetValue(@"TileWallpaper", "1");
//output = true;
break;
//Same as SPAN, but just for custom building of the wallpaper (in other parts of the code)
case WallpaperModes.LAWC:
key.SetValue(@"WallpaperStyle", "22");
key.SetValue(@"TileWallpaper", "1");
//output = true;
break;
default:
//output = false;
break;
}
//WORKS, but black screens occasionally:
//output = SystemParametersInfo(SPI_SETDESKWALLPAPER, 0, filename, SPIF_UPDATEINIFILE | SPIF_SENDWININICHANGE);
//output = NativeMethods.SystemParametersInfo(SPI_SETDESKWALLPAPER, 0, filename, SPIF_UPDATEINIFILE | SPIF_SENDWININICHANGE);
output = NativeMethods.SystemParametersInfo(0x0014, 0, filename, 0x0001);
//int result = SystemParametersInfo(SPI_SETDESKWALLPAPER, 0, filename, SPIF_UPDATEINIFILE | SPIF_SENDWININICHANGE);
//output = SystemParametersInfo(SPI_SETDESKWALLPAPER, 0, filename, 0); // 0 = dont save changes to theme https://stackoverflow.com/questions/35716843/how-to-restore-undo-desktop-wallpaper-after-changing
//output = Convert.ToBoolean(result);
//if (Convert.ToBoolean(result) == false)
//{
// MessageBox.Show("ERROR WARNING WARNING WARNING!!!!");
//}
if (output == false)
{
MessageBox.Show("There was an error setting the wallpaper.", "Error Setting Wallpaper", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
return(output);
}