第一步：將窗體的FormBorderStyle設置為none，WindowState設為Maximized
占據整個屏幕。
第二步：使用鉤子監控全局鍵盤事件。即屏蔽掉大部分系統熱鍵。但是屏蔽ctrl+alt+del 任務管理器則較復雜，這個特例後面討論。
使用全局鉤子應該注意的地方：將代碼放到一個獨立的類庫裡面（只有dll才能被注射到其他進程中）。
using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;
using System.IO;
using System.Reflection;
namespace KeyboardHookDLL
{
public class KeyboardHook
{
public delegate int KeyboardProc(int nCode, IntPtr wParam, IntPtr lParam);
static int hKeyboardHook = 0;
KeyboardProc KeyboardHookProcedure;
/// <summary>
/// 鉤子函數,需要引用空間(using System.Reflection;)
/// 線程鉤子監聽鍵盤消息設為2,全局鉤子監聽鍵盤消息設為13
/// 線程鉤子監聽鼠標消息設為7,全局鉤子監聽鼠標消息設為14
/// </summary>
public const int WH_KEYBOARD = 13;
public const int WH_MOUSE_LL = 14;
public struct KeyboardMSG
{
public int vkCode;
public int scanCode;
public int flags;
public int time;
public int dwExtraInfo;
}
//private FileStream MyFs;
//各種鍵位的ASC碼
private const byte LLKHF_ALTDOWN = 0x20;
private const byte VK_CAPITAL = 0x14;
private const byte VK_ESCAPE = 0x1B;
private const byte VK_F4 = 0x73;
private const byte VK_LCONTROL = 0xA2;
private const byte VK_NUMLOCK = 0x90;
private const byte VK_RCONTROL = 0xA3;
private const byte VK_SHIFT = 0x10;
private const byte VK_TAB = 0x09;
//public const int WH_KEYBOARD = 13;
private const int WH_KEYBOARD_LL = 13;
private const int WH_MOUSE = 7;
//private const int WH_MOUSE_LL = 14;
private const int WM_KEYDOWN = 0x100;
private const int WM_KEYUP = 0x101;
private const int WM_LBUTTONDBLCLK = 0x203;
private const int WM_LBUTTONDOWN = 0x201;
private const int WM_LBUTTONUP = 0x202;
private const int WM_MBUTTONDBLCLK = 0x209;
private const int WM_MBUTTONDOWN = 0x207;
private const int WM_MBUTTONUP = 0x208;
private const int WM_MOUSEMOVE = 0x200;
private const int WM_MOUSEWHEEL = 0x020A;
private const int WM_RBUTTONDBLCLK = 0x206;
private const int WM_RBUTTONDOWN = 0x204;
private const int WM_RBUTTONUP = 0x205;
private const int WM_SYSKEYDOWN = 0x104;
private const int WM_SYSKEYUP = 0x105;
//private static int hKeyboardHook = 0;
/// <summary>
/// vs2008中的聲明方法，在vs2010中略有不同
/// </summary>
/// <returns></returns>
[DllImport("kernel32")]
public static extern int GetCurrentThreadId();
[DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention =
CallingConvention.StdCall)]
public static extern int SetWindowsHookEx(int idHook, KeyboardProc lpfn, IntPtr
hInstance, int threadId);
[DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention =
CallingConvention.StdCall)]
public static extern bool UnhookWindowsHookEx(int idHook);
[DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
public static extern int CallNextHookEx(int idHook, int nCode, IntPtr wParam, IntPtr lParam);
[DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.Winapi)]
public static extern short GetKeyState(int keycode);
//在這裡你可以自己定義要攔截的鍵。
private int KeyboardHookProc(int nCode, IntPtr wParam, IntPtr lParam)
{
KeyboardMSG m = (KeyboardMSG)Marshal.PtrToStructure(lParam, typeof(KeyboardMSG));
if (
((int)m.vkCode == 91) || ((int)m.vkCode == 92) ||
((m.vkCode == VK_TAB) && ((m.flags & LLKHF_ALTDOWN) != 0)) ||
((m.vkCode == VK_ESCAPE) && ((m.flags & LLKHF_ALTDOWN) != 0)) ||
((m.vkCode == VK_F4) && ((m.flags & LLKHF_ALTDOWN) != 0)) ||
(m.vkCode == VK_ESCAPE) && ((GetKeyState(VK_LCONTROL) & 0x8000) != 0) ||
(m.vkCode == VK_ESCAPE) && ((GetKeyState(VK_RCONTROL) & 0x8000) != 0)
)
{
return 1;
}
return CallNextHookEx(hKeyboardHook, nCode, wParam, lParam);
&nb
