最近在做一个恶搞程序，就是打开后，程序获得桌面的截图然后，然后全屏显示在屏幕上，，用户此时则不能进行任何操作。
此时希望用户不能通过键盘alt+F4来结束程序及通过Win的组合键对窗口进行操作。我在网上搜索了一下，采用全局键盘钩子的方法可以做到屏蔽用户对键盘的操作。。以下为相关代码，用到了Form1_load事件和Form1_FormClosing事件：
using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; using System.Runtime.InteropServices; using System.Reflection; namespace WindowsApplication10 { public partial class Form1 : Form { // 安装钩子 [DllImport("user32.dll")] public static extern int SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hInstance, int threadId); // 卸载钩子 [DllImport("user32.dll")] public static extern bool UnhookWindowsHookEx(int idHook); // 继续下一个钩子 [DllImport("user32.dll")] public static extern int CallNextHookEx(int idHook, int nCode, Int32 wParam, IntPtr lParam); //声明定义 public delegate int HookProc(int nCode, Int32 wParam, IntPtr lParam); static int hKeyboardHook = 0; HookProc KeyboardHookProcedure; public Form1() { InitializeComponent(); } private void Form1_Load(object sender, EventArgs e) { HookStart(); } private void Form1_FormClosing(object sender, FormClosingEventArgs e) { HookStop(); } // 安装钩子 public void HookStart() { if (hKeyboardHook == 0) { // 创建HookProc实例 KeyboardHookProcedure = new HookProc(KeyboardHookProc); //定义全局钩子 hKeyboardHook = SetWindowsHookEx(13, KeyboardHookProcedure, Marshal.GetHINSTANCE(Assembly.GetExecutingAssembly().GetModules()[0]), 0);//如果无效，就把 Marshal.GetHINSTANCE(Assembly.GetExecutingAssembly().GetModules()[0]) 改成IntPtr.Zero if (hKeyboardHook == 0) { HookStop(); throw new Exception("SetWindowsHookEx failed."); } } } //钩子子程就是钩子所要做的事情。 private int KeyboardHookProc(int nCode, Int32 wParam, IntPtr lParam) { //这里可以添加别的功能的代码 return 1; } // 卸载钩子 public void HookStop() { bool retKeyboard = true; if (hKeyboardHook != 0) { retKeyboard = UnhookWindowsHookEx(hKeyboardHook); hKeyboardHook = 0; } if (!(retKeyboard)) throw new Exception("UnhookWindowsHookEx failed."); } } }
（注：该方法可以屏蔽win和alt+F4但是不能屏蔽ctrl+alt+del）