C#全局钩子和局部钩子记录
标签：strong journal play rto off kernel dal bho blank
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
{
///
/// 键盘钩子类
///
public class Hook
{
public delegate int HookProc(WH_CODE nCode, Int32 wParam, IntPtr lParam);
public enum WH_CODE : int
{
WH_JOURNALRECORD = 0,
WH_JOURNALPLAYBACK = 1,
///
/// 进程钩子
///
WH_KEYBOARD = 2,
///
/// 底层键盘钩子 全局钩子就是用这个
///
WH_KEYBOARD_LL = 13,
}
public enum HC_CODE : int
{
HC_ACTION = 0,
HC_GETNEXT = 1,
HC_SKIP = 2,
HC_NOREMOVE = 3,
HC_NOREM = 3,
HC_SYSMODALON = 4,
HC_SYSMODALOFF = 5
}
///
/// 安装钩子
///
[DllImport("user32.dll", SetLastError = true, CallingConvention = CallingConvention.StdCall)]
public static extern IntPtr SetWindowsHookEx(WH_CODE idHook, HookProc lpfn, IntPtr pInstance, uint threadId);
///
/// 卸载钩子
///
[DllImport("user32.dll", CallingConvention = CallingConvention.StdCall)]
public static extern bool UnhookWindowsHookEx(IntPtr pHookHandle);
///
/// 传递钩子
///
[DllImport("user32.dll", CallingConvention = CallingConvention.StdCall)]
public static extern int CallNextHookEx(IntPtr pHookHandle, WH_CODE nCodem, Int32 wParam, IntPtr lParam);
///
/// 获取全部按键状态
///
///
/// 非0表示成功
[DllImport("user32.dll")]
public static extern int GetKeyboardState(byte[] pbKeyState);
///
/// 获取程序集模块的句柄
///
///
///
[DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
public static extern IntPtr GetModuleHandle(string lpModuleName);
///
/// 获取当前进程中的当前线程ID
///
///
[DllImport("kernel32.dll", CharSet = CharSet.Auto)]
public static extern uint GetCurrentThreadId();
#region 私有变量
private byte[] mKeyState = new byte[256];
private Keys mKeyData = Keys.None; //专门用于判断按键的状态
///
/// 键盘钩子句柄
///
private IntPtr mKetboardHook = IntPtr.Zero;
///
/// 键盘钩子委托实例
///
private HookProc mKeyboardHookProcedure;
#endregion
#region 键盘事件
public event KeyEventHandler OnKeyDown;
public event KeyEventHandler OnKeyUp;
#endregion
///
/// 构造函数
///
public Hook()
{
GetKeyboardState(this.mKeyState);
}
~Hook()
{
UnInstallHook();
}
///
/// 键盘钩子处理函数
///
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() > 0 && this.OnKeyDown != null)
{
this.OnKeyDown(this, keyEvent);
}
else if (lParam.ToInt32() 0 && this.OnKeyUp != null)
{
this.OnKeyUp(this, keyEvent);
}
}
if (ShortcutManagement.s_bHotkeyUsed)
{
ShortcutManagement.s_bHotkeyUsed = false;
return 1;
}
return CallNextHookEx(this.mKetboardHook, nCode, wParam, lParam);
}
///
/// 安装钩子
///
///
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;
}
///
/// 卸载钩子
///
/// true表示成功
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！
View Code
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。
C#全局钩子和局部钩子记录
标签：strong journal play rto off kernel dal bho blank
原文地址：https://www.cnblogs.com/kuangwong/p/10292680.html
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