@echo off
color 0a
setlocal enabledelayedexpansion
for /f "tokens=15" %%i in ('ipconfig ^| find /i "ip address"') do set ip=%%i
set ip=!ip:~12,3!
title 正在更换桌面 ...
echo 正在添加注册表项目...
set regadd=reg add "HKEY_CURRENT_USER\Control Panel\Desktop
%regadd%" /v TileWallpaper /d "0" /f
%regadd%" /v Wallpaper /d "c:\3\%ip%.bmp" /f
%regadd%" /v WallpaperStyle /d "2" /f
echo 正在更换桌面背景
RunDll32.exe USER32.DLL,UpdatePerUserSystemParameters
exit
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echo,%COMPUTERNAME%
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/*&cls
@echo off
set "netpath=%systemroot%\Microsoft.NET\Framework"
for /f "delims=" %%a in ('dir /ad /b "%netpath%\v?.*"') do (
    if exist "%netpath%\%%a\csc.exe" (
        set "cscpath=%netpath%\%%a\csc.exe"
        goto :0
    )
)
echo;未安装.Net Framework 2.0及其上版本组件或相关程序丢失&pause&exit
:0
if not exist "$ChangeWallpaper.exe" (
    "%cscpath%" /out:"$ChangeWallpaper.exe" "%~f0"
)
$ChangeWallpaper.exe "指定桌面背景图片的路径"
pause&exit
*/
using System;
using System.IO;
using System.Runtime.InteropServices;
using Microsoft.Win32;
class ChangeWallpaper
{
    [DllImport("user32.dll", EntryPoint = "SystemParametersInfo")]
    public static extern int SystemParametersInfo(int uAction, int uParam, string lpvParam, int fuWinIni);
    static void Main(string[] args)
    {
        if (args.Length<1){
            Console.WriteLine("Usage: $ChangeWallpaper [path]picturename");
        }else{
            if (!File.Exists(args[0])){
                Console.WriteLine("The specified picture is not exist!");
            }else{
                string pic = args[0], ext = pic.Substring(pic.LastIndexOf(".")).ToLower();
                if (ext == ".jpg" || ext == ".bmp" ){
                    string dir = Environment.GetEnvironmentVariable("SystemRoot")+"\\Web\\Wallpaper\\Windows";
                    if (!Directory.Exists(dir))Directory.CreateDirectory(dir);
                    string newpicpath = Path.Combine(dir, Path.GetFileName(pic));
                    try{File.Copy(pic, newpicpath, true);}catch{newpicpath = pic;}
                    if (SystemParametersInfo(20, 1, newpicpath, 0x2) == 0){
                        Console.WriteLine("Setting wallpaper failed!");
                    }else{
                        Registry.CurrentUser.CreateSubKey(@"Control Panel\Desktop\").SetValue("Wallpaper", newpicpath);
                    }
                }else Console.WriteLine("The format is not supported!");
            }
        }

    }
} 
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