@echo off
set "dnfpath=C:\\Windows\\Microsoft.NET\\Framework"
for /f "delims=" %%v in ('dir /ad /b %dnfpath%\\v?.*') do (
         if exist %dnfpath%\\%%v\\csc.exe set cscpath=%dnfpath%\\%%v\\csc.exe
)
< "%~f0" more +15 > %temp%\\estCapture.cs
%cscpath% /out:%cd%\\estCapture.exe %temp%\\estCapture.cs 1>nul 2>nul
estCapture.exe
start estCapture.bmp
ping -n 2 127.1 1>nul 2>nul
del estCapture.exe 2>nul

goto:eof

:estCapture

using System.Drawing;
using System.Drawing.Imaging;
using System.Windows.Forms;

public class MyClass
{
        public static void Main()
        {
                        Image img = new Bitmap(Screen.AllScreens[0].Bounds.Width, Screen.AllScreens[0].Bounds.Height);
                        Graphics g = Graphics.FromImage(img);
                        g.CopyFromScreen(new Point(0, 0), new Point(0, 0), Screen.AllScreens[0].Bounds.Size);
                        img.Save("estCapture.bmp", ImageFormat.Bmp);
        }
}

展示下批处理调用 .NET 的威力，需要 .NET Framework支持，测试环境： Windows Vista + .Net Framework 3.0 。代码比较简单，没写注释哈。