GLOBAL HOOK example C#

Form1.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Text.RegularExpressions;
using System.IO;
using System.Drawing.Imaging;

using System.Runtime.InteropServices;


namespace WFA
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            
            InitializeComponent();
          
        }


        // ... { GLOBAL HOOK }
        [DllImport("user32.dll")]
        static extern IntPtr SetWindowsHookEx(int idHook, LowLevelKeyboardProc callback, IntPtr hInstance, uint threadId);
 
        [DllImport("user32.dll")]
        static extern bool UnhookWindowsHookEx(IntPtr hInstance);
 
        [DllImport("user32.dll")]
        static extern IntPtr CallNextHookEx(IntPtr idHook, int nCode, int wParam, IntPtr lParam);
 
        [DllImport("kernel32.dll")]
        static extern IntPtr LoadLibrary(string lpFileName);
 
        private delegate IntPtr LowLevelKeyboardProc(int nCode, IntPtr wParam, IntPtr lParam);
 
        const int WH_KEYBOARD_LL = 13; // Номер глобального LowLevel-хука на клавиатуру
        const int WM_KEYDOWN = 0x100; // Сообщения нажатия клавиши
 
        private LowLevelKeyboardProc _proc = hookProc;
 
        private static IntPtr hhook = IntPtr.Zero;
 
        public void SetHook()
        {
            IntPtr hInstance = LoadLibrary("User32");
            hhook = SetWindowsHookEx(WH_KEYBOARD_LL, _proc, hInstance, 0);
        }
 
        public static void UnHook()
        {
            UnhookWindowsHookEx(hhook);
        }
 
        public static IntPtr hookProc(int code, IntPtr wParam, IntPtr lParam)
        {
            if (code >= 0 && wParam == (IntPtr)WM_KEYDOWN)
            {
                int vkCode = Marshal.ReadInt32(lParam);
                //////ОБРАБОТКА НАЖАТИЯ
                if (vkCode.ToString() == "162")
                {
                    MessageBox.Show("You pressed a CTR");                    
                }
                return (IntPtr)1;
            }
            else
                return CallNextHookEx(hhook, code, (int)wParam, lParam);
        }
 
        private void Form1_Closing(object sender, System.ComponentModel.CancelEventArgs e)
        {
            // убираем хук
            UnHook();
         
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            // Устанавливаем хук
            SetHook();
        }


    }

}

@Joer89 You are not calling CallNextHookEx in case you find the strings you are writing to your stream you return before that...
You should always call CallNextHookEx. And btw... please use a switch case instead of if /else cascades...

Thanks! 1st of one hundred not working hook examples.

What a great example, however I cannot hook lower case characters. Can you help me?

Во время выполнения программы нельзя печатать( что делать?

Great. Thanks

Wohh , thx! finally found!