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Posted 27 Jun 2007

Hooking in Microsoft .NET

, 27 Jun 2007
An article discussing hook implementation in .NET
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;

namespace HookedAp
    public partial class Form1 : Form
        public Form1()

        private void btnInstall_Click(object sender, EventArgs e)
            m_oHookManager.HookInvoked += new Win32Hook.HookEventHandler(m_oHookManager_OnHookMessage);

        void m_oHookManager_OnHookMessage(object sender, HookEventArgs hea)
            if ((QueueStatus)hea.wParam == QueueStatus.PM_REMOVE)
                if (hea.Message.message == 0x100) /*This is a WM_KEYDOWN Message*/
                    char ch = (char)hea.Message.wParam;
                    MessageBox.Show(string.Format("The character {0} caught in hook procedure.", ch));

        private void Form1_FormClosed(object sender, FormClosedEventArgs e)
            if (m_oHookManager != null)

        private Win32Hook m_oHookManager = new Win32Hook();

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Technical Lead
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