key 차단 (with out debug) (alt+tab, alt+F4, windows key)

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Windows.Forms;

using System.Diagnostics;

using System.Runtime.InteropServices;

namespace BlockShortcuts

{

public partial class Form1 : Form

{

public Form1()

{

InitializeComponent();

}

private delegate int LowLevelKeyboardProcDelegate(int nCode, int

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")]

private static extern int UnhookWindowsHookEx(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;

private int intLLKey;

private KBDLLHOOKSTRUCT lParam;

private struct KBDLLHOOKSTRUCT

{

public int vkCode;

int scanCode;

public int flags;

int time;

int dwExtraInfo;

}

private int LowLevelKeyboardProc(

int nCode, int wParam,

ref KBDLLHOOKSTRUCT lParam)

{

bool blnEat = false;

switch (wParam)

{

case 256:

case 257:

case 260:

case 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)) || ((true) &&

(lParam.flags == 32)))

{

blnEat = true;

}

break;

}

if (blnEat)

return 1;

else return CallNextHookEx(0, nCode, wParam, ref lParam);

}

private 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 ReleaseKeyboardHook()

{

intLLKey = UnhookWindowsHookEx(intLLKey);

}

private void checkBox1_CheckedChanged(object sender, EventArgs e)

{

if (checkBox1.Checked)

KeyboardHook(this, e);

else

ReleaseKeyboardHook();

}

}

}