WinFrom中如何屏蔽各种热键

Question

我要做一个考试系统，想打开软件后全屏，屏蔽任何可以切换出去的可能
要如何做呢？
都有什么可能呢？因为是考试软件不能屏蔽输入法的

Answer 1

把Control、Alt和Win键一屏蔽几乎就没问题了

Answer 2

    [System.Runtime.InteropServices.DllImport("user32.dll")]
        static extern bool SetForegroundWindow(IntPtr hWnd);        private void Form1_Load(object sender, EventArgs e)
        {
            this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;
            
            this.ShowInTaskbar = false;
            this.TopMost = true;
            this.timer1.Interval = 1;
            this.timer1.Enabled = true;
            this.WindowState = FormWindowState.Maximized;
        }        private void timer1_Tick(object sender, EventArgs e)
        {
            SetForegroundWindow(this.Handle);
        }

Answer 3

设置窗体在前面
[DllImport("User32.dll ", EntryPoint = "SetParent")]
private static extern IntPtr SetParent(IntPtr hWndChild, IntPtr hWndNewParent);
[DllImport("user32.dll ", EntryPoint = "ShowWindow")]
public static extern int ShowWindow(IntPtr hwnd, int nCmdShow); 
private void button1_Click(object sender, EventArgs e)
{
    Process p = new Process();
    p.StartInfo.FileName = "cmd.exe ";
    p.StartInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Minimized;    p.Start();
    System.Threading.Thread.Sleep(100);
     SetParent(p.MainWindowHandle, this.Handle);
    ShowWindow(p.MainWindowHandle, 3);}int WINDOW_HANDLER = FindWindow(null, @"Form1");
 //设为系统前台窗体并激活
SetForegroundWindow((System.IntPtr)WINDOW_HANDLER);

Answer 4

直接贴代码，我以前用过
 #region 钩子程序
        //委托 
        //public delegate int HookProc(int nCode, int wParam, IntPtr lParam);
        //static int hHook = 0;
        //public const int WH_KEYBOARD_LL = 13;        //LowLevel键盘截获，如果是WH_KEYBOARD＝2，并不能对系统键盘截取，Acrobat Reader会在你截取之前获得键盘。 
        //HookProc KeyBoardHookProcedure;        //键盘Hook结构函数 
        //[StructLayout(LayoutKind.Sequential)]
        //public class KeyBoardHookStruct
        //{
        //    public int vkCode;
        //    public int scanCode;
        //    public int flags;
        //    public int time;
        //    public int dwExtraInfo;
        //}        //设置钩子 
        //[DllImport("user32.dll")]
        //public static extern int SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hInstance, int threadId);
        //[DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
        //抽掉钩子 
        //public static extern bool UnhookWindowsHookEx(int idHook);
        //[DllImport("user32.dll")]
        //调用下一个钩子 
        //public static extern int CallNextHookEx(int idHook, int nCode, int wParam, IntPtr lParam);        //[DllImport("kernel32.dll")]
        //public static extern int GetCurrentThreadId();        //[DllImport("kernel32.dll")]
        //public static extern IntPtr GetModuleHandle(string name);
        #endregion #region
        //public void Hook_Start()
        //{
        //    // 安装键盘钩子 
        //    if (hHook == 0)
        //    {
        //        KeyBoardHookProcedure = new HookProc(KeyBoardHookProc);        //        //hHook = SetWindowsHookEx(2, 
        //        //            KeyBoardHookProcedure, 
        //        //          GetModuleHandle(Process.GetCurrentProcess().MainModule.ModuleName), GetCurrentThreadId());         //        hHook = SetWindowsHookEx(WH_KEYBOARD_LL,
        //                  KeyBoardHookProcedure,
        //                GetModuleHandle(Process.GetCurrentProcess().MainModule.ModuleName), 0);        //        //如果设置钩子失败. 
        //        if (hHook == 0)
        //        {
        //            Hook_Clear();
        //            //throw new Exception("设置Hook失败!"); 
        //        }
        //    }
        //}        //取消钩子事件 
        //public void Hook_Clear()
        //{
        //    bool retKeyboard = true;
        //    if (hHook != 0)
        //    {
        //        retKeyboard = UnhookWindowsHookEx(hHook);
        //        hHook = 0;
        //    }
        //    //如果去掉钩子失败. 
        //    if (!retKeyboard) throw new Exception("UnhookWindowsHookEx failed.");
        //}        //这里可以添加自己想要的信息处理         //public static int KeyBoardHookProc(int nCode, int wParam, IntPtr lParam)
        //{
        //    if (nCode >= 0)
        //    {
        //        KeyBoardHookStruct kbh = (KeyBoardHookStruct)Marshal.PtrToStructure(lParam, typeof(KeyBoardHookStruct));
        //        if (kbh.vkCode == 91)  // 截获左win(开始菜单键) 
        //        {
        //            return 1;
        //        }
        //        if (kbh.vkCode == 92)// 截获右win 
        //        {
        //            return 1;
        //        }
        //        if (kbh.vkCode == (int)Keys.Escape && (int)Control.ModifierKeys == (int)Keys.Control) //截获Ctrl+Esc 
        //        {
        //            return 1;
        //        }
        //        if (kbh.vkCode == (int)Keys.F4 && (int)Control.ModifierKeys == (int)Keys.Alt)  //截获alt+f4 
        //        {
        //            return 1;
        //        }        //        if ((int)Control.ModifierKeys == (int)Keys.Control + (int)Keys.Alt + (int)Keys.Delete)      //截获Ctrl+Alt+Delete 
        //        {
        //            return 1;
        //        }
        //        if (kbh.vkCode == (int)Keys.Tab && (int)Control.ModifierKeys == (int)Keys.Alt) //截获alt+tab 
        //        {
        //            return 1;
        //        }         //    }
        //    return CallNextHookEx(hHook, nCode, wParam, lParam);
        //}
        #endregion