本文所述为基于c#实现的hook实例,该实例可用来屏蔽系统热键。程序主要实现了安装钩子、传递钩子、卸载钩子等功能。在传递钩子中：
<param name="phookhandle">是您自己的钩子函数的句柄。用该句柄可以遍历钩子链</param>
<param name="ncode">把传入的参数简单传给callnexthookex即可</param>
<param name="wparam">把传入的参数简单传给callnexthookex即可</param>，
在hook类中定义了一些私有变量：键盘钩子句柄、键盘钩子委托实例、底层的钩子变量等。在钩子捕获消息后，对消息进行处理。
具体实现hook代码如下：
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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 设置和屏蔽系统热键
{
class hook
{
#region 私有变量
private intptr m_pkeyboardhook = intptr.zero;/// 键盘钩子句柄
public delegate int hookproc(int ncode, int32 wparam, intptr lparam);/// 钩子委托声明
private hookproc m_keyboardhookprocedure;/// 键盘钩子委托实例
public const int idhook = 13;/// 底层的钩子变量
[dllimport("user32.dll", callingconvention = callingconvention.stdcall)]
public static extern intptr setwindowshookex(int idhook, hookproc lpfn, intptr pinstance, int threadid);/// 安装钩子
[dllimport("user32.dll", callingconvention = callingconvention.stdcall)]/// 卸载钩子
public static extern bool unhookwindowshookex(intptr phookhandle);
/// 传递钩子
/// <param name="phookhandle">是您自己的钩子函数的句柄。用该句柄可以遍历钩子链</param>
/// <param name="ncode">把传入的参数简单传给callnexthookex即可</param>
/// <param name="wparam">把传入的参数简单传给callnexthookex即可</param>
/// <param name="lparam"></param>
/// <returns></returns>
[dllimport("user32.dll", callingconvention = callingconvention.stdcall)]
public static extern int callnexthookex(intptr phookhandle, int ncode, int32 wparam, intptr lparam);
[structlayout(layoutkind.sequential)]
public struct keymsg
{
public int vkcode;
public int scancode;
public int flags;
public int time;
public int dwextrainfo;
}
protected const int wm_queryendsession = 0x0011;
protected const int wm_keydown = 0x100;
protected const int wm_keyup = 0x101;
protected const int wm_syskeydown = 0x104;
protected const int wm_syskeyup = 0x105;
protected const byte vk_shift = 0x10;
protected const byte vk_capital = 0x14;
protected const byte vk_numlock = 0x90;
protected const byte vk_lshift = 0xa0;
protected const byte vk_rshift = 0xa1;
protected const int vk_lwin = 91;
protected const int vk_rwin = 92;
protected const byte vk_lcontrol = 0xa2;
protected const byte vk_rcontrol = 0x3;
protected const byte vk_lalt = 0xa4;
protected const byte vk_ralt = 0xa5;
protected const byte llkhf_altdown = 0x20;
public bool porwer = true;//是否屏蔽porwer键
public static int pp = 0;//热键的返回值
public static bool isset = false;//是否设置屏蔽热键,false为设置屏蔽的热键
public static bool ishotkey = false;
public static bool isinstall = false;//是否安装钩子，true为安装
#endregion
#region 事件的声明
public event keyeventhandler keydown;//键盘按下事件
public event keyeventhandler keyup;//键盘松开事件
public event keypresseventhandler keypress;//键盘单击事件
#endregion
#region 方法
/// <summary>
/// 钩子捕获消息后，对消息进行处理
/// </summary>
/// <param ncode="int">标识，键盘是否操作</param>
/// <param wparam="int">键盘的操作值</param>
/// <param lparam="intptr">指针</param>
private int keyboardhookproc(int ncode, int wparam, intptr lparam)
{
if (ncode > -1 && (keydown != null || keyup != null || keypress != null))
{
keymsg keyboardhookstruct = (keymsg)marshal.ptrtostructure(lparam, typeof(keymsg));//获取钩子的相关信息
keyeventargs e = new keyeventargs((keys)(keyboardhookstruct.vkcode));//获取keyeventargs事件的相磁信息
switch (wparam)
{
case wm_keydown://键盘按下操作
case wm_syskeydown:
if (keydown != null)//如果加载了当前事件
{
keydown(this, e);//调用该事件
}
break;
case wm_keyup://键盘松开操作
case wm_syskeyup:
if (keyup != null)//如果加载了当前事件
{
keyup(this, e);//调用该事件
}
break;
}
}
return pp;//是否屏蔽当前热键，1为屏蔽，2为执行
}
#endregion
#region 安装、卸载钩子
/// <summary>
/// 安装钩子
/// </summary>
/// <returns>是否安装成功</returns>
public bool start()
{
intptr pinstance = (intptr)4194304;//钩子所在实例的句柄
if (this.m_pkeyboardhook == intptr.zero)//如果键盘的句柄为空
{
this.m_keyboardhookprocedure = new hookproc(keyboardhookproc);//声明一个托管钩子
this.m_pkeyboardhook = setwindowshookex(idhook, m_keyboardhookprocedure, pinstance, 0);//安装钩子
if (this.m_pkeyboardhook == intptr.zero)//如果安装失败
{
this.stop();//卸载钩子
return false;
}
}
isinstall = true;//安装了钩子
return true;
}
/// <summary>
/// 卸载钩子
/// </summary>
/// <returns>是否卸载成功</returns>
public bool stop()
{
if (isinstall == false)//如果没有安装钩子
{
return true;
}
bool result = true;
if (this.m_pkeyboardhook != intptr.zero)//如果安装了钩子
{
result = (unhookwindowshookex(this.m_pkeyboardhook) && result);//卸载钩子
this.m_pkeyboardhook = intptr.zero;//清空键盘的钩子句柄
}
return result;
}
#endregion 公共方法
}
}
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