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AuthorQuestion
KeyBoard Hook not working
Posted on: 01 Dec 2007


Hi

I have made a application to control the HotKeys.

The Form1 contains ::
------------------
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;
using System.Diagnostics;

namespace Hook
{
    public partial class Form1 : Form
    {

        private delegate int LowLevelKeyboardProcDelegate(int nCode, int wParam, ref KBDLLHOOKSTRUCT lParam);
        private delegate IntPtr HookHandlerDelegate(int nCode, IntPtr wParam, ref KBDLLHOOKSTRUCT lParam);

        [DllImport("user32.dll", EntryPoint = "SetWindowsHookExA", CharSet = CharSet.Ansi)]
        private static extern int SetWindowsHookEx(int idHook, LowLevelKeyboardProcDelegate lpfn, int hMod, int dwThreadId);
        [DllImport("user32.dll", EntryPoint = "UnHookWindowsHookEx", CharSet = CharSet.Ansi)]
        private static extern int UnHookWindowsEx(int hHook);
        [DllImport("user32.dll", EntryPoint = "CallNextHookEx", CharSet = CharSet.Ansi)]
        private static extern int CallNextHookEx(int hHook, int nCode, int wParam, ref KBDLLHOOKSTRUCT lParam);

        const int WH_KEYBOARD_LL = 13;

        public struct KBDLLHOOKSTRUCT
        {
            public int vkCode;
            int scanCode;
            public int flags;
            int time;
            int dwExtraInfo;
        }


        private int intLLKey;
        private KBDLLHOOKSTRUCT lParam;

        public Form1()
        {
            InitializeComponent();
        }
    

        private int LowLevelKeyboardProc(int nCode, int wParam, ref KBDLLHOOKSTRUCT lParam)
        {
            bool blnEat = false;
            switch (wParam)
            {
                case (256 | 257 | 260 | 261):
                    //Alt+Tab, Alt+Esc, Ctrl+Esc, Windows Key
                    if (((lParam.vkCode == 9) && (lParam.flags == 32)) || ((lParam.vkCode == 27) && (lParam.flags == 32)) || ((lParam.vkCode == 27) && (lParam.flags == 0)) || ((lParam.vkCode == 91) && (lParam.flags == 1)) || ((lParam.vkCode == 92) && (lParam.flags == 1)))
                    {
                        blnEat = true;
                    }
                    break;
            }
            if (blnEat)
                return 1;
            else return CallNextHookEx(0, nCode, wParam, ref lParam);

        }
        public void KeyboardHook(object sender, EventArgs e)
        {
            intLLKey = SetWindowsHookEx(WH_KEYBOARD_LL, new LowLevelKeyboardProcDelegate(LowLevelKeyboardProc),
                System.Runtime.InteropServices.Marshal.GetHINSTANCE(System.Reflection.Assembly.GetExecutingAssembly().GetModules()[0]).ToInt32(),
                0);
        }


        private void Form1_Load(object sender, EventArgs e)
        {
            KeyboardHook(sender, e);
        }

        public static void main()
        {           
            Application.Run(new Form1());
       
        }

        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            //UnHookWindowsEx(intLLKey);
        }

        private void button1_Click(object sender, EventArgs e)
        {
            KeyboardHook(sender, e);
        }


    }

 

}

-----------------

But this is not wokring please help me.


Regards

jklanka


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