NumpadMouseEmul

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Threading;
using System.Windows.Forms;
using System.Runtime.InteropServices;
using System.Windows;

namespace NumpadMouseEmul
{
    class Program
    {
        class Win32
        {
            public const uint MOUSEEVENTF_ABSOLUTE = 0x8000;
            public const uint MOUSEEVENTF_LEFTDOWN = 0x0002;
            public const uint MOUSEEVENTF_LEFTUP = 0x0004;
            public const uint MOUSEEVENTF_MIDDLEDOWN = 0x0020;
            public const uint MOUSEEVENTF_MIDDLEUP = 0x0040;
            public const uint MOUSEEVENTF_MOVE = 0x0001;
            public const uint MOUSEEVENTF_RIGHTDOWN = 0x0008;
            public const uint MOUSEEVENTF_RIGHTUP = 0x0010;
            public const uint MOUSEEVENTF_XDOWN = 0x0080;
            public const uint MOUSEEVENTF_XUP = 0x0100;
            public const uint MOUSEEVENTF_WHEEL = 0x0800;
            public const uint MOUSEEVENTF_HWHEEL = 0x01000;
            [DllImport("user32.dll")]
            public static extern void mouse_event(uint dwFlags, uint dx, uint dy, uint dwData, int dwExtraInfo);
            // Check mouse buttons & keys if pressed
            [DllImport("user32.dll")]
            public static extern short GetAsyncKeyState(System.Windows.Forms.Keys vKey);
        }

        [DllImport("User32.dll")]
        private static extern short GetAsyncKeyState(System.Windows.Forms.Keys vKey); // Keys enumeration
        [DllImport("User32.dll")]
        private static extern short GetAsyncKeyState(System.Int32 vKey);

        [DllImport("user32.dll", SetLastError = true)]
        static extern void keybd_event(byte bVk, byte bScan, uint dwFlags, UIntPtr dwExtraInfo);
        public static void PressKey(Keys key, bool up)
        {
            const int KEYEVENTF_EXTENDEDKEY = 0x1;
            const int KEYEVENTF_KEYUP = 0x2;
            if (up)
            {
                keybd_event((byte)key, 0x45, KEYEVENTF_EXTENDEDKEY | KEYEVENTF_KEYUP, (UIntPtr)0);
            }
            else
            {
                keybd_event((byte)key, 0x45, KEYEVENTF_EXTENDEDKEY, (UIntPtr)0);
            }
        }

        static void Main(string[] args)
        {
            while (true)
            {
                if (Win32.GetAsyncKeyState(Keys.LButton) != 0)
                {
                    PressKey(Keys.NumPad5, true);
                    Thread.Sleep(2);
                    PressKey(Keys.NumPad5, false);
                    Console.Write(5);
                }
                Thread.Sleep(20);
                if (Win32.GetAsyncKeyState(Keys.RButton) != 0)
                {
                    PressKey(Keys.NumPad4, true);
                    Thread.Sleep(2);
                    PressKey(Keys.NumPad4, false);
                    Console.Write(4);
                }
                Thread.Sleep(20);
            }
        }
    }
}