前言
有时候开发会遇到这样一个需求，软件需要屏蔽用户的组合快捷键或某些按键，避免强制退出软件，防止勿操作等。
原理
1、要实现组合键，按键拦截，需要用到user32.dll中的SetWindowsHookEx。
2、要拦截ctrl+alt+del，需要使用ntdll.dll的ZwSuspendProcess函数挂起winlogon程序，退出之后使用ZwResumeProcess恢复winlogon程序。
3、软件需要开启topMost，以及全屏，否则离开软件则拦截无效。
4、如果要实现热键监听（非焦点拦截），则需要用到user32.dll的RegisterHotKey以及UnregisterHotKey。
实现
1、Program类
using System;using System.Collections.Generic;using System.Diagnostics;using System.Runtime.InteropServices;using System.Windows.Forms;namespace LockForm{ static class Program { /// /// 应用程序的主入口点。 /// [STAThread] static void Main() { Application.EnableVisualStyles(); Application.SetCompatibleTextRenderingDefault(false); SuspendWinLogon(); Application.Run(new Form1()); ResumeWinLogon(); } [DllImport("ntdll.dll")] public static extern int ZwSuspendProcess(IntPtr ProcessId); [DllImport("ntdll.dll")] public static extern int ZwResumeProcess(IntPtr ProcessId); private static void SuspendWinLogon() { Process[] pc = Process.GetProcessesByName("winlogon"); if (pc.Length > 0) { ZwSuspendProcess(pc[0].Handle); } } private static void ResumeWinLogon() { Process[] pc = Process.GetProcessesByName("winlogon"); if (pc.Length > 0) { ZwResumeProcess(pc[0].Handle); } } }} 2、Form1类
using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Diagnostics;using System.Drawing;using System.Runtime.InteropServices;using System.Text;using System.Windows.Forms;namespace LockForm{ public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { if (textBox1.Text == "123") { Application.ExitThread(); } else { webBrowser1.Navigate(textBox1.Text); } } private void Form1_Load(object sender, EventArgs e) { //webBrowser1.Navigate("https://baidu.com"); HookStart(); //this.TopMost = false; //SuspendWinLogon(); } private void webBrowser1_NewWindow(object sender, CancelEventArgs e) { e.Cancel = true; webBrowser1.Navigate(webBrowser1.Document.ActiveElement.GetAttribute("href")); } private void button3_Click(object sender, EventArgs e) { webBrowser1.GoBack(); } private void button2_Click(object sender, EventArgs e) { webBrowser1.GoForward(); } private void button4_Click(object sender, EventArgs e) { webBrowser1.GoHome(); } private void webBrowser1_Navigated(object sender, WebBrowserNavigatedEventArgs e) { textBox1.Text = webBrowser1.Url.ToString(); } private void webBrowser1_Navigating(object sender, WebBrowserNavigatingEventArgs e) { } #region 键盘钩子 public delegate int HookProc(int nCode, int wParam, IntPtr lParam);//定义全局钩子过程委托，以防被回收（钩子函数原型） HookProc KeyBoardProcedure; //定义键盘钩子的相关内容，用于截获键盘消息 static int hHook = 0;//钩子函数的句柄 public const int WH_KEYBOARD = 13; //钩子结构函数 public struct KeyBoardHookStruct { public int vkCode; public int scanCode; public int flags; public int time; public int dwExtraInfo; } //安装键盘钩子 public void HookStart() { if (hHook == 0) { //实例化一个HookProc对象 KeyBoardProcedure = new HookProc(Form1.KeyBoardHookProc); //创建线程钩子 hHook = Win32API.SetWindowsHookEx(WH_KEYBOARD, KeyBoardProcedure, Win32API.GetModuleHandle(Process.GetCurrentProcess().MainModule.ModuleName), 0); //如果设置线程钩子失败 if (hHook == 0) { HookClear(); } } } //取消钩子 public void HookClear() { bool rsetKeyboard = true; if (hHook != 0) { rsetKeyboard = Win32API.UnhookWindowsHookEx(hHook); hHook = 0; } if (!rsetKeyboard) { throw new Exception("取消钩子失败!"); } } //对截获的键盘操作的处理 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)//截获左边WIN键 { return 1; } if (kbh.vkCode == 92)//截获右边WIN键 { return 1; } if (kbh.vkCode == (int)Keys.Escape && (int)Control.ModifierKeys == (int)Keys.Control)//截获Ctrl+ESC键 { return 1; } if (kbh.vkCode == (int)Keys.Escape && (int)Control.ModifierKeys == (int)Keys.Alt) { return 1; } if (kbh.vkCode == (int)Keys.F4 && (int)Control.ModifierKeys == (int)Keys.Alt)//截获ALT+F4 { return 1; } if (kbh.vkCode == (int)Keys.Tab && (int)Control.ModifierKeys == (int)Keys.Alt)//截获ALT+TAB { return 1; } if (kbh.vkCode == (int)Keys.Delete&&(int)Control.ModifierKeys == (int)Keys.Control + (int)Keys.Alt) { return 1; } if ( kbh.vkCode == (int) Keys.Escape && (int) Control.ModifierKeys == (int) Keys.Control + (int) Keys.Alt ) /* 截获Ctrl+Shift+Esc */ { return 1; } } return Win32API.CallNextHookEx(hHook, nCode, wParam, lParam); } #endregion }} 3、声明windows api
//设置钩子 [DllImport("user32.dll")] public static extern int SetWindowsHookEx(int idHook, LockForm.Form1.HookProc lpfn, IntPtr hInstance, int threadID); //卸载钩子 [DllImport("user32.dll", CallingConvention = CallingConvention.StdCall)] public static extern bool UnhookWindowsHookEx(int idHook); //调用下一个钩子 [DllImport("user32.dll")] public static extern int CallNextHookEx(int idHook, int nCode, int wParam, IntPtr lParam);
PS：
windows api查询
http://www.pinvoke.net/index.aspx
demo下载
链接：http://pan.baidu.com/s/1jGpOvsE 密码：dbj2