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C#全局钩子和局部钩子记录
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源自：https://blog.csdn.net/programvae/article/details/80292076
最近碰巧要使用键盘钩子，于是在网上搜索了一番，发现大多数博客的文章都是雷同的，根本就没有讲清楚全局钩子和局部钩子的区别，于是特开一贴，讲全局钩子和局部钩子捋一捋。也供后面的人学习。
因为大部分应用都应该采用局部钩子，所以我这儿使用的是局部钩子，而全局钩子的例子网上到处都是。
大部分网上参考文章都只是展示了全局钩子的写法，而线程钩子的写法和介绍相对少一些，特别是关键语句上如果定义的不正确是没有任何效果的，在自己反复尝试后决定留下一个正确的版本分享出来
代码如下
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Reflection;
using System.Runtime.InteropServices;
using System.Windows.Forms; namespace AssistToolSet.Util
{
/// <summary>
/// 键盘钩子类
/// </summary>
public class Hook
{
public delegate int HookProc(WH_CODE nCode, Int32 wParam, IntPtr lParam);
public enum WH_CODE : int
{
WH_JOURNALRECORD = ,
WH_JOURNALPLAYBACK = ,
/// <summary>
/// 进程钩子
/// </summary>
WH_KEYBOARD = , /// <summary>
/// 底层键盘钩子 全局钩子就是用这个 /// </summary>
WH_KEYBOARD_LL = ,
} public enum HC_CODE : int
{
HC_ACTION = ,
HC_GETNEXT = ,
HC_SKIP = ,
HC_NOREMOVE = ,
HC_NOREM = ,
HC_SYSMODALON = ,
HC_SYSMODALOFF =
} /// <summary>
/// 安装钩子
/// </summary>
[DllImport("user32.dll", SetLastError = true, CallingConvention = CallingConvention.StdCall)]
public static extern IntPtr SetWindowsHookEx(WH_CODE idHook, HookProc lpfn, IntPtr pInstance, uint threadId); /// <summary>
/// 卸载钩子
/// </summary>
[DllImport("user32.dll", CallingConvention = CallingConvention.StdCall)]
public static extern bool UnhookWindowsHookEx(IntPtr pHookHandle);
/// <summary>
/// 传递钩子
/// </summary>
[DllImport("user32.dll", CallingConvention = CallingConvention.StdCall)]
public static extern int CallNextHookEx(IntPtr pHookHandle, WH_CODE nCodem, Int32 wParam, IntPtr lParam); /// <summary>
/// 获取全部按键状态
/// </summary>
/// <param name="pbKeyState"></param>
/// <returns>非0表示成功</returns>
[DllImport("user32.dll")]
public static extern int GetKeyboardState(byte[] pbKeyState); /// <summary>
/// 获取程序集模块的句柄
/// </summary>
/// <param name="lpModuleName"></param>
/// <returns></returns>
[DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
public static extern IntPtr GetModuleHandle(string lpModuleName); /// <summary>
/// 获取当前进程中的当前线程ID
/// </summary>
/// <returns></returns>
[DllImport("kernel32.dll", CharSet = CharSet.Auto)]
public static extern uint GetCurrentThreadId(); #region 私有变量 private byte[] mKeyState = new byte[];
private Keys mKeyData = Keys.None; //专门用于判断按键的状态 /// <summary>
/// 键盘钩子句柄
/// </summary>
private IntPtr mKetboardHook = IntPtr.Zero; /// <summary>
/// 键盘钩子委托实例
/// </summary>
private HookProc mKeyboardHookProcedure; #endregion #region 键盘事件 public event KeyEventHandler OnKeyDown;
public event KeyEventHandler OnKeyUp; #endregion /// <summary>
/// 构造函数
/// </summary>
public Hook()
{
GetKeyboardState(this.mKeyState);
} ~Hook()
{
UnInstallHook();
} /// <summary>
/// 键盘钩子处理函数
/// </summary>
private int KeyboardHookProc(WH_CODE nCode, Int32 wParam, IntPtr lParam)
{
/*全局钩子应该这样设定
KeyboardHookStruct MyKeyboardHookStruct = (KeyboardHookStruct)Marshal.PtrToStructure(lParam, typeof(KeyboardHookStruct));
*/
// 定义为线程钩子时，wParam的值是击打的按键，与Keys里的对应按键相同
if ((nCode == (int)HC_CODE.HC_ACTION) && (this.OnKeyDown != null || this.OnKeyUp != null))
{
mKeyData = (Keys)wParam;
KeyEventArgs keyEvent = new KeyEventArgs(mKeyData);
//这里简单的通过lParam的值的正负情况与按键的状态相关联
if (lParam.ToInt32() > && this.OnKeyDown != null)
{
this.OnKeyDown(this, keyEvent);
}
else if (lParam.ToInt32() < && this.OnKeyUp != null)
{
this.OnKeyUp(this, keyEvent);
}
}
if (ShortcutManagement.s_bHotkeyUsed)
{
ShortcutManagement.s_bHotkeyUsed = false;
return ;
} return CallNextHookEx(this.mKetboardHook, nCode, wParam, lParam);
}
/// <summary>
/// 安装钩子
/// </summary>
/// <returns></returns>
public bool InstallHook()
{
//线程钩子时一定要通过这个取得的值才是操作系统下真实的线程
uint result = GetCurrentThreadId(); if (this.mKetboardHook == IntPtr.Zero)
{
this.mKeyboardHookProcedure = new HookProc(this.KeyboardHookProc);
//注册线程钩子时第三个参数是空
this.mKetboardHook = SetWindowsHookEx(WH_CODE.WH_KEYBOARD, this.mKeyboardHookProcedure, IntPtr.Zero, result);
/*
如果是全局钩子应该这样使用
this.mKetboardHook = SetWindowsHookEx(WH_CODE.WH_KEYBOARD_LL, mKeyboardHookProcedure,GetModuleHandle(System.Diagnostics.Process.GetCurrentProcess().MainModule.ModuleName), 0);
*/
if (this.mKetboardHook == IntPtr.Zero)
{
return false;
}
}
return true;
} /// <summary>
/// 卸载钩子
/// </summary>
/// <returns>true表示成功 </returns>
public bool UnInstallHook()
{
bool result = true;
if (this.mKetboardHook != IntPtr.Zero)
{
result = UnhookWindowsHookEx(this.mKetboardHook) && result;
this.mKetboardHook = IntPtr.Zero;
}
return result;
}
} }
---------------------
作者：PGEva
来源：CSDN
原文：https://blog.csdn.net/programvae/article/details/80292076
版权声明：本文为博主原创文章，转载请附上博文链接！
通过这次认知，意识到，以后如果要做这些接触相关的api的时候，我们应该尽量去查官方文档，而不是一开始就是查看别人的博客。应该以官方文档为主。一定要记住键盘钩子事件。
32位和64位的系统不一样。
