C# Winform 实现屏蔽键盘的win和alt+F4的实现代码

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）