using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Threading;

using System.Windows;

using System.Runtime.InteropServices;



namespace ConsoleApplication2

{

    class Program

    {

        [DllImport("user32.dll", EntryPoint = "FindWindow", CharSet = CharSet.Auto)]

        private extern static IntPtr FindWindow(string classname, string captionName);



        //[DllImport("user32.dll", EntryPoint = "FindWindowEx", CharSet = CharSet.Auto)]

        //private extern static IntPtr FindWindowEx(IntPtr parent, IntPtr child, string classname, string captionName);



        //[DllImport("user32.dll")]

        //static extern IntPtr SendMessage(IntPtr hWnd, UInt32 Msg, IntPtr wParam, [MarshalAs(UnmanagedType.LPStr)] string lParam);



        [DllImport("user32.dll")]

        [return: MarshalAs(UnmanagedType.Bool)]

        static extern bool SetForegroundWindow(IntPtr hWnd);



        static void Main(string[] args)

        {

            

            IntPtr mwh1 = IntPtr.Zero;



            while (mwh1 == IntPtr.Zero)

            {

                Thread.Sleep(1000);

                mwh1 = FindWindow(null, "无标题 - 记事本");

            }





            SetForegroundWindow(mwh1);

            //发送字符串

            System.Windows.Forms.SendKeys.SendWait("username");

            //模拟tab键

            System.Windows.Forms.SendKeys.SendWait("{TAB}");

            //模拟ctrl+A全选

            System.Windows.Forms.SendKeys.SendWait("^a");

            //模拟回车键

            //System.Windows.Forms.SendKeys.SendWait("{ENTER}");

        }

    }

}