Source code for getcurrentwallpapers.cs

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using System;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.IO;
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using System.Linq;
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using System.Text;
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using System.Text.RegularExpressions;
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using Microsoft.Win32;
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namespace RobvanderWoude
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{
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	internal class GetCurrentWallpapers
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	{
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		static readonly string progver = "1.01";

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		static bool openwallpapers = false;
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		static bool singlewallpaper = false;
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		static bool verbosedisplay = false;
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		static int Main( string[] args )
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		{
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			#region Parse Command Line
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			foreach ( string arg in args )
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			{
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				switch ( arg.ToUpper( ) )
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				{
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					case "/?":
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						return ShowHelp( );
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					case "/O":
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						if ( openwallpapers )
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						{
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							return ShowHelp( "Duplicate command line switch /O" );

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						}
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						openwallpapers = true;
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						break;
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					case "/S":
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						if ( singlewallpaper )
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						{
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							return ShowHelp( "Duplicate command line switch /S" );

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						}
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						singlewallpaper = true;
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						break;
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					case "/V":
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						if ( verbosedisplay )
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						{
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							return ShowHelp( "Duplicate command line switch /V" );

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						}
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						verbosedisplay = true;
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						break;
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					default:
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						return ShowHelp( "Invalid command line argument \"{0}\"", arg );

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				}
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			}
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			#endregion Parse Command Line
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			Dictionary<string, string> wallpapers = new Dictionary<string, string>( );

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			#region List Wallpapers
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			try
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			{
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				using ( RegistryKey key = Registry.CurrentUser.OpenSubKey( @"Control Panel\\Desktop" ) )

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				{
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					byte[] imagebytes = (byte[])key.GetValue( "TranscodedImageCache" );

					string image = Bytes2Path( imagebytes );

					if ( !wallpapers.Keys.Contains( image ) )

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					{
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						wallpapers.Add( image, @"HKEY_CURRENT_USER\Control Panel\Desktop\TranscodedImageCache" );

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					}
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					if ( !singlewallpaper )
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					{
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						// Check if more cached values are available

						foreach ( string valuename in key.GetValueNames( ) )

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						{
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							if ( valuename.StartsWith( "TranscodedImageCache_" ) )

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							{
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								imagebytes = (byte[])key.GetValue( valuename );

								image = Bytes2Path( imagebytes );

								if ( image != null && !wallpapers.Keys.Contains( image ) )

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								{
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									wallpapers.Add( image, @"HKEY_CURRENT_USER\Control Panel\Desktop\" + valuename );

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								}
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							}
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						}
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					}
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				}
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			}
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			catch { } // ignore errors
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			#endregion List Wallpapers
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			#region Return Results
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			int maxlen = 0;
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			if ( verbosedisplay )
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			{
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				foreach ( string wallpaper in wallpapers.Keys )

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				{
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					maxlen = Math.Max( maxlen, wallpaper.Length );

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				}
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				foreach ( string wallpaper in wallpapers.Keys )

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				{
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					Console.WriteLine( "{0,-" + maxlen + "}\t{1}", wallpaper, wallpapers[wallpaper] );

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					if ( openwallpapers )
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					{
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						Process.Start( wallpaper );
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					}
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				}
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			}
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			else
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			{
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				foreach ( string wallpaper in wallpapers.Keys )

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				{
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					Console.WriteLine( wallpaper );
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					if ( openwallpapers )
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					{
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						Process.Start( wallpaper );
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					}
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				}
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			}
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			#endregion Return Results
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			return wallpapers.Count;
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		}
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		static string Bytes2Path( byte[] bytesarray )

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		{
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			string imageraw = Encoding.Unicode.GetString( bytesarray ).Replace( "\0", "" );

			string image = imageraw.Substring( imageraw.IndexOf( ":\\" ) - 1 );

			string pattern = @"(?<=\.[a-z0-9]+)[^a-z0-9].*";

			image = Regex.Replace( image, pattern, "" );

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			if ( File.Exists( image ) )
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			{
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				return image;
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			}
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			return null;
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		}
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		static int ShowHelp( params string[] errmsg )

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		{
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			#region Help Text
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			/*
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			GetCurrentWallpapers,  Version 1.01
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			Get the path(s) of the current wallpaper(s)

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			Usage:   GetCurrentWallpapers  [ /O ]  [ /S ]  [ /V ]

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			Where:   /O    tells the program to open each wallpaper found

			         /S    tells the program to get only the first wallpaper it finds

			         /V    tells the program to display the registry keys for each

			               wallpaper found (Verbose mode)

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			Notes:   Without /S the listed wallpapers may include previous ones too.

			         Return code ("errorlevel") equals the number of wallpapers found,

			         or -1 in case of (command line) errors.

```
 
```

			Credits: Based on PowerShell code by Ramesh Srinivasan on GitHub:

			         https://gist.github.com/winhelponline/4dc635770d5b123f6c1a719326037880

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			Written by Rob van der Woude
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			https://www.robvanderwoude.com
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			*/
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			#endregion Help Text
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			#region Error Message
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			if ( errmsg.Length > 0 )
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			{
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				List<string> errargs = new List<string>( errmsg );

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				errargs.RemoveAt( 0 );
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				Console.Error.WriteLine( );
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				Console.ForegroundColor = ConsoleColor.Red;

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				Console.Error.Write( "ERROR:\t" );
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				Console.ForegroundColor = ConsoleColor.White;

				Console.Error.WriteLine( errmsg[0], errargs.ToArray( ) );

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				Console.ResetColor( );
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			}
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			#endregion Error Message
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			#region Display Help Text
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			Console.Error.WriteLine( );
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			Console.Error.WriteLine( "GetCurrentWallpapers,  Version {0}", progver );

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			Console.Error.WriteLine( "Get the path(s) of the current wallpaper(s)" );

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			Console.Error.WriteLine( );
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			Console.Error.Write( "Usage:   " );
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			Console.ForegroundColor = ConsoleColor.White;

			Console.Error.WriteLine( "GetCurrentWallpapers  [ /O ]  [ /S ]  [ /V ]" );

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			Console.ResetColor( );
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			Console.Error.WriteLine( );
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			Console.Error.Write( "Where:   " );
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			Console.ForegroundColor = ConsoleColor.White;

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			Console.Error.Write( "/O" );
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			Console.ResetColor( );
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			Console.Error.WriteLine( "    tells the program to open each wallpaper found" );

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			Console.ForegroundColor = ConsoleColor.White;

			Console.Error.Write( "         /S" );

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			Console.ResetColor( );
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			Console.Error.WriteLine( "    tells the program to get only the first wallpaper it finds" );

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			Console.ForegroundColor = ConsoleColor.White;

			Console.Error.Write( "         /V" );

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			Console.ResetColor( );
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			Console.Error.WriteLine( "    tells the program to display the registry keys for each" );

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			Console.Error.Write( "               wallpaper found (" );

			Console.ForegroundColor = ConsoleColor.White;

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			Console.Error.Write( "V" );
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			Console.ResetColor( );
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			Console.Error.WriteLine( "erbose mode)" );

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			Console.Error.WriteLine( );
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			Console.Error.WriteLine( "Notes:   Without /S the listed wallpapers may include previous ones too." );

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			Console.Error.WriteLine( "         Return code (\"errorlevel\") equals the number of wallpapers found," );

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			Console.Error.WriteLine( "         or -1 in case of (command line) errors." );

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			Console.Error.WriteLine( );
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			Console.Error.WriteLine( "Credits: Based on PowerShell code by Ramesh Srinivasan on GitHub:" );

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			Console.ForegroundColor = ConsoleColor.DarkGray;

			Console.Error.WriteLine( "         https://gist.github.com/winhelponline/4dc635770d5b123f6c1a719326037880" );

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			Console.ResetColor( );
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			Console.Error.WriteLine( );
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			Console.Error.WriteLine( "Written by Rob van der Woude" );

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			Console.Error.WriteLine( "https://www.robvanderwoude.com" );

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			#endregion Display Help Text
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			return -1;
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		}
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	}
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}
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