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[C#] Hook To Disable Win Shortcuts C# (.NET) - Printable Version

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+---- Thread: [C#] Hook To Disable Win Shortcuts C# (.NET) (/showthread.php?tid=465123)

Hook To Disable Win Shortcuts C# (.NET) - Volim te - Jun 6, 2010

C# (.NET)

OK I Will make this as fast as i can

1st We Need To Import System.Diagnostics And
System.Runtime.InteropServices

Code
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.Runtime.InteropServices;
using System.Diagnostics;

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

Now assign callback function each time keyboard process
Code
public Form1()
        {
            InitializeComponent();
ProcessModule objCurrentModule =
Process.GetCurrentProcess().MainModule;

            objKeyboardProcess = new LowLevelKeyboardProc(captureKey);

            ptrHook = SetWindowsHookEx(13, objKeyboardProcess, GetModuleHandle(objCurrentModule.ModuleName), 0);
         }

Now Under that we need

Code
[StructLayout(LayoutKind.Sequential)]

        private struct KBDLLHOOKSTRUCT
        {

            public Keys key;

            public int scanCode;

            public int flags;

            public int time;

            public IntPtr extra;

        }
Time For The DLL imports
Code
private delegate IntPtr LowLevelKeyboardProc(int nCode, IntPtr wParam, IntPtr lParam);

        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        private static extern IntPtr SetWindowsHookEx(int id, LowLevelKeyboardProc callback, IntPtr hMod, uint dwThreadId);

        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        private static extern bool UnhookWindowsHookEx(IntPtr hook);

        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        private static extern IntPtr CallNextHookEx(IntPtr hook, int nCode, IntPtr wp, IntPtr lp);

        [DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        private static extern IntPtr GetModuleHandle(string name);

        [DllImport("user32.dll", CharSet = CharSet.Auto)]

Last Bit
Code
private static extern short GetAsyncKeyState(Keys key);
        private IntPtr ptrHook;
        private LowLevelKeyboardProc objKeyboardProcess;
        private IntPtr captureKey(int nCode, IntPtr wp, IntPtr lp)
        {
            if (nCode >= 0)
            {
                KBDLLHOOKSTRUCT objKeyInfo = (KBDLLHOOKSTRUCT)Marshal.PtrToStructure(lp, typeof(KBDLLHOOKSTRUCT));
                //DISABLES THE KEYS HERE>>>>>>!`
              
                //NOTE!! DOES --NOT-- Disable ctrl + Alt + Del!
                if (objKeyInfo.key == Keys.Alt || objKeyInfo.key == Keys.F4 || objKeyInfo.key == Keys.Escape || objKeyInfo.key == Keys.RControlKey || objKeyInfo.key == Keys.RWin
                    || objKeyInfo.key == Keys.LWin)
                {
                  
                  
                    return (IntPtr)1;
                  
                }
            }

            return CallNextHookEx(ptrHook, nCode, wp, lp);

        }

Full Code
||NOTE THIS WORKS 4 MOST KEYS AND SHORTCUTS BUT NOT CTRL & ALT & DEL (WORKS FOR EACH KEY CTRL ,DEL AND AIT JUST NOT THE SHORTCUT!

Code
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.Runtime.InteropServices;
using System.Diagnostics;

namespace KyREADER
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            ProcessModule objCurrentModule = Process.GetCurrentProcess().MainModule;

            objKeyboardProcess = new LowLevelKeyboardProc(captureKey);

            ptrHook = SetWindowsHookEx(13, objKeyboardProcess, GetModuleHandle(objCurrentModule.ModuleName), 0);
        }
        
        [StructLayout(LayoutKind.Sequential)]

        private struct KBDLLHOOKSTRUCT
        {

            public Keys key;

            public int scanCode;

            public int flags;

            public int time;

            public IntPtr extra;

        }

        // DLL IMPORTS FOR KEYBOARD HOOK!>>>>>
        private delegate IntPtr LowLevelKeyboardProc(int nCode, IntPtr wParam, IntPtr lParam);

        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        private static extern IntPtr SetWindowsHookEx(int id, LowLevelKeyboardProc callback, IntPtr hMod, uint dwThreadId);

        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        private static extern bool UnhookWindowsHookEx(IntPtr hook);

        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        private static extern IntPtr CallNextHookEx(IntPtr hook, int nCode, IntPtr wp, IntPtr lp);

        [DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        private static extern IntPtr GetModuleHandle(string name);

        [DllImport("user32.dll", CharSet = CharSet.Auto)]
      
        
        private static extern short GetAsyncKeyState(Keys key);
        private IntPtr ptrHook;
        private LowLevelKeyboardProc objKeyboardProcess;
        private IntPtr captureKey(int nCode, IntPtr wp, IntPtr lp)
        {
            if (nCode >= 0)
            {
                KBDLLHOOKSTRUCT objKeyInfo = (KBDLLHOOKSTRUCT)Marshal.PtrToStructure(lp, typeof(KBDLLHOOKSTRUCT));
                //DISABLES THE KEYS HERE>>>>>>!`
              
                //NOTE!! DOES --NOT-- Disable ctrl + Alt + Del!
                if (objKeyInfo.key == Keys.Alt || objKeyInfo.key == Keys.F4 || objKeyInfo.key == Keys.Escape || objKeyInfo.key == Keys.RControlKey || objKeyInfo.key == Keys.RWin
                    || objKeyInfo.key == Keys.LWin)
                {
                  
                  
                    return (IntPtr)1;
                  
                }
            }

            return CallNextHookEx(ptrHook, nCode, wp, lp);

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

        }


* - The Ostrich - Nov 6, 2010

how do you re-enable them?

* - Volim te - Nov 6, 2010

The hook only works when the process is running so to
Enable them the program has to be ended/killed

* - The Ostrich - Nov 7, 2010

i get the error "'InitializeComponent' does not exist in the current context" how do i fix that?

* - Volim te - Nov 7, 2010

you ,Porlly put this part in the wrong place
Code
ProcessModule objCurrentModule =
Process.GetCurrentProcess().MainModule;

    objKeyboardProcess = new LowLevelKeyboardProc(captureKey);

    ptrHook = SetWindowsHookEx(13, objKeyboardProcess, GetModuleHandle(objCurrentModule.ModuleName), 0);
you ,do not make a new void for ^ that
it go's here (its under your project's namespace)
Code
public partial class Form1 : Form
    {
  public Form1()
  {
    InitializeComponent();
// here
  }
PM me or post if you keep getting that error and i will upload a project of it

* - spyware - Jan 18, 2013

Thanks for the share, it works perfectly :)
Got many keys disabled :)