using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace test3
{
    public partial class ExampleForm : Form{
    [System.Runtime.InteropServices.DllImport("user32.dll")]
    protected static extern IntPtr SetWindowsHookEx(HookType code, HookProc func, IntPtr hInstance, int threadID);
    [System.Runtime.InteropServices.DllImport("user32.dll")]
    static extern int CallNextHookEx(IntPtr hhk, int nCode, IntPtr wParam, IntPtr lParam);
    [System.Runtime.InteropServices.DllImport("kernel32.dll", SetLastError = true)]
    private static extern IntPtr GetModuleHandle(string lpModuleName);
    public enum HookType : int
    {
        WH_KEYBOARD = 2,
    };

      public delegate int HookProc(int nCode, IntPtr wParam, IntPtr lParam);
      private HookProc myCallbackDelegate = null;

      public ExampleForm(){
        this.myCallbackDelegate = new HookProc(this.MyCallbackFunction);
        SetWindowsHookEx(HookType.WH_KEYBOARD, this.myCallbackDelegate, GetModuleHandle("user32")/*IntPtr.Zero*/, /*AppDomain.GetCurrentThreadId()*/0);
      }

      private int MyCallbackFunction(int code, IntPtr wParam, IntPtr lParam){
        if (code < 0) {
             return CallNextHookEx(IntPtr.Zero, code, wParam, lParam);
         }
        // convert to a System.Windows.Forms.Keys enum constant
        Keys key = (Keys)wParam.ToInt32();
      //  if (lParam.ToInt32() < 0 /*&& wParam.ToInt32() == (int)'A'*/) 
            Console.WriteLine(key);
        //return the value returned by CallNextHookEx
        return CallNextHookEx(IntPtr.Zero, code, wParam, lParam);
      }
    }

}