Question

怎么用c#写的键盘钩子屏蔽键盘按键

Answer 1

c# 钩子屏蔽键盘快捷键

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace Hook_Demo
{
public partial class Form1 : Form
{
Win32Hook.Hook hook;
public Form1()
{
InitializeComponent();
this.FormBorderStyle = FormBorderStyle.None;
this.WindowState = FormWindowState.Maximized;
this.TopMost = true;
hook = new Win32Hook.Hook();
hook.Start();
this.FormClosing += new FormClosingEventHandler(Form1_FormClosing);
this.buttonExit.Click+=new EventHandler(buttonExit_Click);
}
void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
hook.Close();
}
private void buttonExit_Click(object sender, EventArgs e)
{
Application.Exit();
}
}
}

cs

* 调用：
* Hook hook = new Hook();
* hook.Start();//安装钩子
* hook.Close();//卸载钩子
* 如果需要屏蔽键盘，请在KeyBoardHookProc方法中添加处理
*
* 时 间:2010/7/27 15:56:05
*
* 备注:调用此类必须已管理员身份运行，否则没有权限写入注册表
* 判断是否是管理员代码：（isAdministrator如果为true为系统管理员，false不是管理员）
* AppDomain myDomain = Thread.GetDomain();
* myDomain.SetPrincipalPolicy(PrincipalPolicy.WindowsPrincipal);
* WindowsPrincipal myPrincipal = (WindowsPrincipal)Thread.CurrentPrincipal;
* bool isAdministrator = myPrincipal.IsInRole(WindowsBuiltInRole.Administrator);
*/
using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;
using System.Diagnostics;
using System.Windows.Forms;
using System.IO;
using Microsoft.Win32;
namespace Win32Hook
{
public class Hook : IDisposable
{
public delegate int HookProc(int nCode, int wParam, IntPtr lParam);
static int hHook = 0;
public const int WH_KEYBOARD_LL = 13;
HookProc KeyBoardHookProcedure;
[StructLayout(LayoutKind.Sequential)]
public class KeyBoardHookStruct
{
public int vkCode;
public int scanCode;
public int flags;
public int time;
public int dwExtraInfo;
}
[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)]
public static extern bool UnhookWindowsHookEx(int idHook);
[DllImport("user32.dll")]
public static extern int CallNextHookEx(int idHook, int nCode, int wParam, IntPtr lParam);
[DllImport("kernel32.dll")]
public static extern IntPtr GetModuleHandle(string name);
public void Start()
{
// 安装键盘钩子
if (hHook == 0)
{
KeyBoardHookProcedure = new HookProc(KeyBoardHookProc);
hHook = SetWindowsHookEx(WH_KEYBOARD_LL, KeyBoardHookProcedure, GetModuleHandle(Process.GetCurrentProcess().MainModule.ModuleName), 0);
//如果设置钩子失败.
if (hHook == 0)
Close();
else
{
RegistryKey key = Registry.CurrentUser.OpenSubKey(@"Software\Microsoft\Windows\CurrentVersion\Policies\System", true);
if (key == null)//如果该项不存在的话，则创建该项
key = Registry.CurrentUser.CreateSubKey(@"Software\Microsoft\Windows\CurrentVersion\Policies\System");
key.SetValue("DisableTaskMgr", 1, RegistryValueKind.DWord);
key.Close();
}
}
}
public void Close()
{
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.");
RegistryKey key = Registry.CurrentUser.OpenSubKey(@"Software\Microsoft\Windows\CurrentVersion\Policies\System", true);
if (key != null)
{
key.DeleteValue("DisableTaskMgr", false);
key.Close();
}
}
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 (kbh.vkCode == (int)Keys.Tab && (int)Control.ModifierKeys == (int)Keys.Alt) //截获alt+tab
return 1;
if (kbh.vkCode == (int)Keys.Escape && (int)Control.ModifierKeys == (int)Keys.Control + (int)Keys.Shift) //截获Ctrl+Shift+Esc
return 1;
if (kbh.vkCode == (int)Keys.Space && (int)Control.ModifierKeys == (int)Keys.Alt) //截获alt+空格
return 1;
if (kbh.vkCode == 241) //截获F1
return 1; if (kbh.vkCode == (int)Keys.Control && kbh.vkCode == (int)Keys.Alt && kbh.vkCode == (int)Keys.Delete)
return 1;
if ((int)Control.ModifierKeys == (int)Keys.Control + (int)Keys.Alt + (int)Keys.Delete) //截获Ctrl+Alt+Delete
return 1;
if ((int)Control.ModifierKeys == (int)Keys.Control + (int)Keys.Shift) //截获Ctrl+Shift
return 1;
}
return CallNextHookEx(hHook, nCode, wParam, lParam);
}
#region IDisposable 成员
public void Dispose()
{
Close();
}
#endregion
}
}