c#控制功能键的问题
代码
  private IntPtr pKeyboardHook = IntPtr.Zero;//键盘钩子句柄
        public delegate int HookProc(int nCode, Int32 wParam, IntPtr lParam);// 钩子委托声明
        //键盘钩子委托实例不能省略变量
        private HookProc KeyboardHookProcedure;
        //底层键盘钩子
        public const int idHook = 13;
        //安装钩子
        [DllImport("user32.dll", CallingConvention = CallingConvention.StdCall)]
        public static extern IntPtr SetWindowsHookEx(int idHook, HookProc lpfn,
            IntPtr pInstance, int threadId);
        //卸载钩子
        [DllImport("user32.dll", CallingConvention = CallingConvention.StdCall)]
        public static extern bool UnhookWindowsHookEx(IntPtr pHookHandle);
        //键盘钩子处理函数
        private int KeyboardHookProc(int nCode, Int32 wParam, IntPtr lParam)
        {
            KeyMSG m = (KeyMSG)Marshal.PtrToStructure(lParam, typeof(KeyMSG));
            if (pKeyboardHook != IntPtr.Zero)
            {
                switch (((Keys)m.vkCode))
                {
                    case Keys.LWin:
                    case Keys.RWin:
                    case Keys.Delete:
                    case Keys.Alt:
                    case Keys.Escape:
                    case Keys.F4:
                    case Keys.Control:
                    case Keys.Tab:
                        return 1;
                }
            }
            return 0;
  &