Hook Lwin and Rwin Button

Add a new class to your project and paste this code:

using System;

using System.ComponentModel;

using System.Diagnostics;

using System.Windows.Forms;

using System.Runtime.InteropServices;

public class KeyboardFilter

{

private Keys[] mFilter;

private IntPtr mHook;

private LowLevelKeyboardProc mProc;

public KeyboardFilter(Keys[] keysToFilter)

{

// Install hook

mFilter = keysToFilter;

ProcessModule mod = Process.GetCurrentProcess().MainModule;

mProc = new LowLevelKeyboardProc(KeyboardProc); // Avoid garbage collector problems

mHook = SetWindowsHookEx(13, mProc, GetModuleHandle(mod.ModuleName), 0);

if (mHook == IntPtr.Zero) throw new Win32Exception(Marshal.GetLastWin32Error(), "Failed to set hook");

}

public void Dispose()

{

// Release hook

if (mHook != IntPtr.Zero)

{

UnhookWindowsHookEx(mHook);

mHook = IntPtr.Zero;

}

private IntPtr KeyboardProc(int nCode, IntPtr wp, IntPtr lp)

{

// Callback, filter key

if (nCode >= 0)

{

KBDLLHOOKSTRUCT info = (KBDLLHOOKSTRUCT)Marshal.PtrToStructure(lp, typeof(KBDLLHOOKSTRUCT));

foreach (Keys key in mFilter)

if ((key & Keys.KeyCode) == info.key && CheckModifier(key)) return (IntPtr)1;

}

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

}

private bool CheckModifier(Keys key)

{

// Check if modifier key in required state

if ((key & Keys.Control) == Keys.Control &&

GetAsyncKeyState(Keys.LControlKey) == 0 && GetAsyncKeyState(Keys.RControlKey) == 0) return false;

if ((key & Keys.Shift) == Keys.Shift &&

GetAsyncKeyState(Keys.LShiftKey) == 0 && GetAsyncKeyState(Keys.RShiftKey) == 0)

return false;

if ((key & Keys.Alt) == Keys.Alt &&

GetAsyncKeyState(Keys.LMenu) == 0 && GetAsyncKeyState(Keys.RMenu) == 0)

return false;

return true;

}

// P/Invoke declarations

[StructLayout(LayoutKind.Sequential)]

private struct KBDLLHOOKSTRUCT

{

public Keys key;

public int scanCode;

public int flags;

public int time;

public IntPtr extra;

}

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);

}

Add this line to your main form:

KeyboardFilter filter = new KeyboardFilter(new Keys[] { Keys.LWin, Keys.RWin, Keys.Escape | Keys.Control });