c# 屏蔽快捷键
c# 屏蔽快捷键
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
{
/// <summary>
/// 应用程序的主入口点。
/// </summary>
[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
我不怕千万人阻挡，只怕自己投降。
