在C#中使用钩子实现Alt+F4健窗口最小化功能

   71 }
   72 #endregion
   73
   74 钩子类型的枚举#region 钩子类型的枚举
   75 public enum HookType : int
   76 {
   77 WH_JOURNALRECORD = 0,
   78 WH_JOURNALPLAYBACK = 1,
   79 WH_KEYBOARD = 2,
   80 WH_GETMESSAGE = 3,
   81 WH_CALLWNDPROC = 4,
   82 WH_CBT = 5,
   83 WH_SYSMSGFILTER = 6,
   84 WH_MOUSE = 7,
   85 WH_HARDWARE = 8,
   86 WH_DEBUG = 9,
   87 WH_SHELL = 10,
   88 WH_FOREGROUNDIDLE = 11,
   89 WH_CALLWNDPROCRET = 12,
   90 WH_KEYBOARD_LL = 13,
   91 WH_MOUSE_LL = 14
   92 }
   93 #endregion
   94
   95 虚键值的定义(参照WinUser.h中定义)#region 虚键值的定义(参照WinUser.h中定义)
   96 public enum VirtualKeys
   97 {
   98 VK_SHIFT = 0x10,
   99 VK_CONTROL = 0x11,
  100 VK_MENU = 0x12, //ALT
  101 VK_PAUSE = 0x13,
  102 VK_CAPITAL = 0x14
  103 }
  104 #endregion
  105
  106 钩子委托#region 钩子委托
  107 public delegate int HookProc(int code, IntPtr wParam, IntPtr lParam);
  108 public delegate void HookEventHandler(object sender, HookEventArgs e);
  109 #endregion
  110
  111 钩子事件参数#region 钩子事件参数
  112 public class HookEventArgs : EventArgs
  113 {
  114 public int HookCode;
  115 public IntPtr wParam;
  116 public IntPtr lParam;
  117 public Keys key;
  118 public bool bAltKey;
  119 public bool bCtrlKey;
  120 }
  121 #endregion
  122
  123 钩子类#region 钩子类
  124 public class MyHook
  125 {
  126 调用Windows API#region 调用Windows API
  127 [DllImport("user32.dll")]
  128 static extern IntPtr SetWindowsHookEx(HookType hook, HookProc callback, IntPtr hMod, uint dwThreadId);
  129
  130 [DllImport("user32.dll")]
  131 static extern bool UnhookWindowsHookEx(IntPtr hhk);
  132
  133 [DllImport("user32.dll")]
  134 static extern int CallNextHookEx(IntPtr hhk, int nCode, IntPtr wParam, IntPtr lParam);
  135
  136 [DllImport("user32.dll")]
  137 static extern short GetKeyState(VirtualKeys nVirtKey);
  138 #endregion
  139
  140 局部变量#region 局部变量
  141 private IntPtr m_hook;
  142 private HookType m_hooktype;
  143 private HookProc m_hookproc;
  144
  145 private bool _bCallNext;
  146
  147 public bool CallNextProc
  148 {
  149 get { return _bCallNext; }
  150 set { _bCallNext = value; }
  151 }
  152
  153 #endregion
  154
  155 public event HookEventHandler HookInvoked;
  156
  157 public void Install()
  158 {
  159 m_hook = SetWindowsHookEx(m_hooktype, m_hookproc, IntPtr.Zero, (uint)AppDomain.GetCurrentThreadId());
  160 }
  161
  162 public void Uninstall()
  163 {
  164 if (m_hook != IntPtr.Zero)
  165 {
  166 UnhookWindowsHookEx(m_hook);
  167 }
  168 }
  169
  170 public MyHook(HookType HookType)
  171 {
  172 m_hooktype = HookType;
  173 if (m_hooktype == HookType.WH_KEYBOARD)
  174 {
  175 m_hookproc = new HookProc(KeyHookProcedure);
  176 }
  177 else if (m_hooktype == HookType.WH_CALLWNDPROC)
  178 {
  179 m_hookproc = new HookProc(CallProcHookProcedure);
  180 }
  181 }
  182
  183 protected int KeyHookProcedure(int code, IntPtr wParam, IntPtr lParam)
  184 {
  185 if (code != 0)
  186 {
  187 return CallNextHookEx(m_hook, code, wParam, lParam);
  188 }
  189
  190 if (HookInvoked != null)
  191 {
  192 Keys key = (Keys)wParam.ToInt32();

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