first commit

Program.cs

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+using Microsoft.Win32;
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Runtime.InteropServices;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Wallsh
+{
+    class Program
+    {
+        [DllImport("user32.dll", CharSet = CharSet.Auto)]
+        private static extern Int32 SystemParametersInfo(UInt32 uiAction, int uParam, String pvParam, UInt32 fWinIni);
+        private static UInt32 SPI_GETDESKWALLPAPER = 0x73;
+        private static UInt32 SPI_SETDESKWALLPAPER = 20;
+        private static int MAX_PATH = 260;
+        private static UInt32 SPIF_UPDATEINIFILE = 0x1;
+
+        static void Main(string[] args)
+        {
+            if(args.Length > 0)
+                switch (args[0])
+                {
+                    case "/G":
+                        getWallpaper();
+                       break;
+                    case "/S":
+                        if (args.Length == 2)
+                            setWallpaper(args[1]);
+                        else {
+                            Console.Write("No path introduced!");
+                            Environment.Exit(1);
+                        }
+                        break;
+                    default:
+                        printHelp();
+                        break;
+                }
+            else printHelp();
+        }
+
+        private static void getWallpaper()
+        {
+            string currentWallpaper = new string('\0', MAX_PATH);
+
+            SystemParametersInfo(SPI_GETDESKWALLPAPER, currentWallpaper.Length, currentWallpaper, 0);
+
+            Console.Write(currentWallpaper.Substring(0, currentWallpaper.IndexOf('\0')));
+        }
+
+        private static void setWallpaper(string filename)
+        {
+            if (File.Exists(filename))
+            {
+                SystemParametersInfo(SPI_SETDESKWALLPAPER, 0, filename, SPIF_UPDATEINIFILE);
+                Registry.SetValue(@"HKEY_CURRENT_USER\Control Panel\Desktop", "Wallpaper", filename);
+            }
+            else{
+                Console.Write("Invalid path introduced!");
+                Environment.Exit(1);
+            }
+        }
+
+        private static void printHelp()
+        {
+            string message = 
+                "\r\n wallsh (v0.1): get and set the desktop wallpaper." +
+                "\r\n\r\n Usage:\twallsh [options]" +
+                "\r\n\r\n Options:" +
+                "\r\n /H      \t\t\tprint help" +
+                "\r\n /G      \t\t\tget the current wallpaper" +
+                "\r\n /S [path]\t\t\tset a wallpaper" +
+                "\r\n\r\n Created by Jaume Segarra";
+
+            Console.Write(message);
+        }
+    }
+}

README.md

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+#  wallsh for windows
+
+> Get and set the desktop wallpaper.
+
+## How to install
+- [Download](https://github.com/jaumesegarra/wallsh-windows/releases) the binary file 
+- Execute for add file to the path
+```
+setx path "%path%;C:\wallsh.exe"
+```
+
+## How to use this command
+
+##### Get
+```
+$  wallsh /G
+```
+
+##### Set 
+```
+$ wallsh /S /Users/jaumesegarra/Pictures/world.png
+```