基于C#实现的HOOK键盘钩子实例代码

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：
<paramname="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>
<paramname="nCode">把传入的参数简单传给CallNextHookEx即可</param>
<paramname="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：

usingSystem;
usingSystem.Collections.Generic;
usingSystem.Linq;
usingSystem.Text;
usingSystem.Windows.Forms;
usingSystem.Runtime.InteropServices;
usingSystem.Reflection;
usingSystem.IO;
namespace设置和屏蔽系统热键
{
classHOOK
{
#region私有变量
privateIntPtrm_pKeyboardHook=IntPtr.Zero;///键盘钩子句柄
publicdelegateintHookProc(intnCode,Int32wParam,IntPtrlParam);///钩子委托声明
privateHookProcm_KeyboardHookProcedure;///键盘钩子委托实例
publicconstintidHook=13;///底层的钩子变量
[DllImport("user32.dll",CallingConvention=CallingConvention.StdCall)]
publicstaticexternIntPtrSetWindowsHookEx(intidHook,HookProclpfn,IntPtrpInstance,intthreadId);///安装钩子
[DllImport("user32.dll",CallingConvention=CallingConvention.StdCall)]///卸载钩子
publicstaticexternboolUnhookWindowsHookEx(IntPtrpHookHandle);
///传递钩子
 ///<paramname="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>
///<paramname="nCode">把传入的参数简单传给CallNextHookEx即可</param>
///<paramname="wParam">把传入的参数简单传给CallNextHookEx即可</param>
///<paramname="lParam"></param>
///<returns></returns>
[DllImport("user32.dll",CallingConvention=CallingConvention.StdCall)]
publicstaticexternintCallNextHookEx(IntPtrpHookHandle,intnCode,Int32wParam,IntPtrlParam);
[StructLayout(LayoutKind.Sequential)]
publicstructKeyMSG
{
publicintvkCode;
publicintscanCode;
publicintflags;
publicinttime;
publicintdwExtraInfo;
}
protectedconstintWM_QUERYENDSESSION=0x0011;
protectedconstintWM_KEYDOWN=0x100;
protectedconstintWM_KEYUP=0x101;
protectedconstintWM_SYSKEYDOWN=0x104;
protectedconstintWM_SYSKEYUP=0x105;
protectedconstbyteVK_SHIFT=0x10;
protectedconstbyteVK_CAPITAL=0x14;
protectedconstbyteVK_NUMLOCK=0x90;
protectedconstbyteVK_LSHIFT=0xA0;
protectedconstbyteVK_RSHIFT=0xA1;
protectedconstintVK_LWIN=91;
protectedconstintVK_RWIN=92;
protectedconstbyteVK_LCONTROL=0xA2;
protectedconstbyteVK_RCONTROL=0x3;
protectedconstbyteVK_LALT=0xA4;
protectedconstbyteVK_RALT=0xA5;
protectedconstbyteLLKHF_ALTDOWN=0x20;
publicboolPorwer=true;//是否屏蔽Porwer键
publicstaticintpp=0;//热键的返回值
publicstaticboolisSet=false;//是否设置屏蔽热键,false为设置屏蔽的热键
publicstaticboolisHotkey=false;
publicstaticboolisInstall=false;//是否安装钩子，true为安装
#endregion
#region事件的声明
publiceventKeyEventHandlerKeyDown;//键盘按下事件
publiceventKeyEventHandlerKeyUp;//键盘松开事件
publiceventKeyPressEventHandlerKeyPress;//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>
///<paramnCode="int">标识，键盘是否操作</param>
///<paramwParam="int">键盘的操作值</param>
///<paramlParam="IntPtr">指针</param>
privateintKeyboardHookProc(intnCode,intwParam,IntPtrlParam)
{
if(nCode>-1&&(KeyDown!=null||KeyUp!=null||KeyPress!=null))
{
KeyMSGkeyboardHookStruct=(KeyMSG)Marshal.PtrToStructure(lParam,typeof(KeyMSG));//获取钩子的相关信息
KeyEventArgse=newKeyEventArgs((Keys)(keyboardHookStruct.vkCode));//获取KeyEventArgs事件的相磁信息
switch(wParam)
{
caseWM_KEYDOWN://键盘按下操作
caseWM_SYSKEYDOWN:
if(KeyDown!=null)//如果加载了当前事件
{
KeyDown(this,e);//调用该事件
}
break;
caseWM_KEYUP://键盘松开操作
caseWM_SYSKEYUP:
if(KeyUp!=null)//如果加载了当前事件
{
KeyUp(this,e);//调用该事件
}
break;
}
}
returnpp;//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>
publicboolStart()
{
IntPtrpInstance=(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=newHookProc(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
returnfalse;
}
}
isInstall=true;//安装了钩子
returntrue;
}
///<summary>
///卸载钩子
///</summary>
///<returns>是否卸载成功</returns>
publicboolStop()
{
if(isInstall==false)//如果没有安装钩子
{
returntrue;
}
boolresult=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
}
returnresult;
}
#endregion公共方法
}
}