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：
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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