C# HOOK钩子屏蔽键盘代码

来源：互联网发布：广东人吃老鼠知乎编辑：程序博客网时间：2024/05/16 17:17

C#基于HOOK钩子屏蔽键盘代码，包括了安装钩子和卸载钩子，设置的是线程钩子，或截获键盘上的Ctrl+Esc 、Alt+Esc、alt+f4 、alt+tab、Ctrl+Shift+Esc、截获alt+空格、截获Ctrl+Alt+Delete 、截获Ctrl+Alt+空格，钩子函数,需要引用空间(using System.Reflection;)，线程钩子监听键盘消息设为2,全局钩子监听键盘消息设为13，线程钩子监听鼠标消息设为7,全局钩子监听鼠标消息设为14。

using System;

using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;
using System.Reflection;
using System.IO;
namespace ScreenLock
{
public class KeyboardHook
{
public delegate int KeyboardProc(int nCode, IntPtr wParam, IntPtr lParam);
static int hKeyboardHook = 0;
KeyboardProc KeyboardHookProcedure;
public const int WH_KEYBOARD = 13;
public const int WH_MOUSE_LL = 14;
public struct KeyboardMSG
{
public int vkCode;
public int scanCode;
public int flags;
public int time;
public int dwExtraInfo;
public int VK_CONTROL;
public int VK_MENU;
public int VK_DELETE;
}
[DllImport("kernel32")]
public static extern int GetCurrentThreadId();
[DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
public static extern int SetWindowsHookEx(int idHook, KeyboardProc lpfn, IntPtr hInstance, int threadId);
[DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
public static extern bool UnhookWindowsHookEx(int idHook);
[DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
public static extern int CallNextHookEx(int idHook, int nCode, IntPtr wParam, IntPtr lParam);
private int KeyboardHookProc(int nCode, IntPtr wParam, IntPtr lParam)
{
KeyboardMSG m = (KeyboardMSG)Marshal.PtrToStructure(lParam, typeof(KeyboardMSG));
if ((int)m.vkCode == 91 || (int)m.vkCode == 92 || (int)m.vkCode == 10)
{
return 1;
}
if (((int)m.vkCode == 46) && ((int)m.vkCode == 17) && ((int)m.vkCode == 18))
{
return 2;
}
if (m.vkCode == (int)Keys.Escape && (int)Control.ModifierKeys == (int)Keys.Control) //截获Ctrl+Esc
{
return 1;
}

if (m.vkCode == (int)Keys.Escape && (int)Control.ModifierKeys == (int)Keys.Alt) //截获Alt+Esc
{
return 1;
}
if (m.vkCode == (int)Keys.F4 && (int)Control.ModifierKeys == (int)Keys.Alt) //截获alt+f4
{
return 1;
}
if (m.vkCode == (int)Keys.Tab && (int)Control.ModifierKeys == (int)Keys.Alt) //截获alt+tab
{
return 1;
}
if (m.vkCode == (int)Keys.Escape && (int)Control.ModifierKeys == (int)Keys.Control + (int)Keys.Shift) //截获Ctrl+Shift+Esc
{
return 1;
}
if (m.vkCode == (int)Keys.Space && (int)Control.ModifierKeys == (int)Keys.Alt) //截获alt+空格
{
return 1;
}
if (m.vkCode == (int)Keys.Delete && (int)Control.ModifierKeys == (int)Keys.Control + (int)Keys.Alt) //截获Ctrl+Alt+Delete
{
return 1;
}
if (m.vkCode == (int)Keys.Space && (int)Control.ModifierKeys == (int)Keys.Control + (int)Keys.Alt) //截获Ctrl+Alt+空格
{
return 1;
}
return CallNextHookEx(hKeyboardHook, nCode, wParam, lParam);
}
// 安装钩子
public void KeyMaskStart()
{
if (hKeyboardHook == 0)
{
// 创建HookProc实例
KeyboardHookProcedure = new KeyboardProc(KeyboardHookProc);
// 设置线程钩子
hKeyboardHook = SetWindowsHookEx(WH_KEYBOARD, KeyboardHookProcedure,
Marshal.GetHINSTANCE(Assembly.GetExecutingAssembly().GetModules()[0]), 0);
// 如果设置钩子失败
if (hKeyboardHook == 0)
{
KeyMaskStop();
throw new Exception("SetWindowsHookEx failed.");
}
}
}
// 卸载钩子
public void KeyMaskStop()
{
bool retKeyboard = true;
if (hKeyboardHook != 0)
{
retKeyboard = UnhookWindowsHookEx(hKeyboardHook);
hKeyboardHook = 0;
}
if (!(retKeyboard))
{
throw new Exception("UnhookWindowsHookEx failed.");
}
}
}
}

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