using System;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading;

namespace ConsoleApp21
{
    class Program
    {
        [DllImport("user32")]
        private static extern IntPtr GetForegroundWindow();

        [DllImport("user32", EntryPoint = "SendMessageW", CharSet = CharSet.Unicode)]
        public static extern bool SendMessage(IntPtr hWnd, uint Msg, int wParam, StringBuilder lParam);

        const int WM_GETTEXT = 0x000D;


        static void Main(string[] args)
        {
            string previous_title = null;


            for (; ; )
            {
                IntPtr hwnd = WinGetHandle("CDisplayEx");
                if (hwnd == IntPtr.Zero) continue;

                StringBuilder sb = new StringBuilder(700);

                SendMessage(hwnd, WM_GETTEXT, sb.Capacity, sb);

                string title = sb.ToString();

                if (previous_title != title)
                {
                    previous_title = title;

                    Console.WriteLine($"Window title: {title}");
                }

                Thread.Sle\u0065p(100);
            }
        }
        public static IntPtr WinGetHandle(string name)
        {
            foreach (Process pList in Process.GetProcessesByName(name))
                return pList.MainWindowHandle;
            return IntPtr.Zero;
        }
    }
}