winform键盘全局与线程Hook

定义数据结构

  /// <summary>  /// 声明键盘钩子的封送结构类型  /// </summary>  [StructLayout(LayoutKind.Sequential)]  public class KeyboardHookStruct  {   public int vkCode;//表示一个1到254间的虚拟键盘码   public int scanCode;//表示硬件扫描码   public int flags;   public int time;   public int dwExtraInfo;  }

声明Hook相关方法

  //使用WINDOWS API函数代替获取当前实例的函数,防止钩子失效  [DllImport("kernel32.dll")]  public static extern IntPtr GetModuleHandle(string lpModuleName);  //安装钩子  [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]  public static extern int SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hInstance, int threadId);  //下一个钩子  [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]  public static extern int CallNextHookEx(int idHook, int nCode, Int32 wParam, IntPtr lParam);  //卸载钩子  [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]  public static extern bool UnhookWindowsHookEx(int idHook);  // 取得当前线程编号（线程钩子需要用到）  [DllImport("kernel32.dll")]  static extern int GetCurrentThreadId();

Hook拦截方法

全局Hook

  private int KeyboardHookProc(int nCode, Int32 wParam, IntPtr lParam)  {   if ((nCode >= 0) && (OnKeyDownEvent != null || OnKeyUpEvent != null || OnKeyPressEvent != null))   {    KeyboardHookStruct MyKBHookStruct = (KeyboardHookStruct)Marshal.PtrToStructure(lParam, typeof(KeyboardHookStruct));     //引发OnKeyDownEvent    if (OnKeyDownEvent != null && (wParam == WM_KEYDOWN || wParam == WM_SYSKEYDOWN))    {     Keys keyData = (Keys)MyKBHookStruct.vkCode;     KeyEventArgs e = new KeyEventArgs(keyData);     OnKeyDownEvent(this, e);    }   }   return CallNextHookEx(hKeyboardHook, nCode, wParam, lParam);  }

线程Hook

 private int KeyboardHookProc(int nCode, Int32 wParam, IntPtr lParam)  {   if ((nCode >= 0) && (OnKeyDownEvent != null || OnKeyUpEvent != null || OnKeyPressEvent != null))   {        //引发OnKeyDownEvent    if (OnKeyDownEvent != null && (wParam == WM_KEYDOWN || wParam == WM_SYSKEYDOWN))    {     Keys keyData = (Keys)wParam;     KeyEventArgs e = new KeyEventArgs(keyData);     OnKeyDownEvent(this, e);    }   }   return CallNextHookEx(hKeyboardHook, nCode, wParam, lParam);  }

全局/线程Hook参数结构区别

线程Hook KeyboardHookProc函数的各个参数意义如下：nCode　　　　消息的类型，分HC_ACTION和HC_NOREMOVEwParam　　　　按键的虚拟键码 lParam　　　　按键的相关参数信息，包括重复时间、按键的状态（按下或弹起）等全局Hook KeyboardHookProc函数的各个参数意义如下：nCode　　　　消息的类型，有HC_ACTIONwParam　　　　按键的状态（按下或弹起）WM_KEYDOWN、WM_KEYUP、WM_SYSKEYDOWN、WM_SYSKEYUPlParam　　　　指向KeyboardHookStruct结构的指针，该结构包含了按键的详细信息。

添加Hook

全局Hook

  public void Start()  {   if (hKeyboardHook == 0)   {    KeyboardHookProcedure = new HookProc(KeyboardHookProc);    using (System.Diagnostics.Process curProcess = System.Diagnostics.Process.GetCurrentProcess())    using (System.Diagnostics.ProcessModule curModule = curProcess.MainModule)     hKeyboardHook = SetWindowsHookEx(13, KeyboardHookProcedure, GetModuleHandle(curModule.ModuleName), 0);     if (hKeyboardHook == 0)    {     Stop();     throw new Exception("Set GlobalKeyboardHook failed!");    }   }  }

线程Hook

 public void Start()  {   if (hKeyboardHook == 0)   {    KeyboardHookProcedure = new HookProc(KeyboardHookProc);    hKeyboardHook = SetWindowsHookEx(2, KeyboardHookProcedure, IntPtr.Zero, GetCurrentThreadId());     if (hKeyboardHook == 0)    {     Stop();     throw new Exception("Set GlobalKeyboardHook failed!");    }   }  }

注：idHook 钩子类型，即确定钩子监听何种消息
线程钩子监听键盘消息应设为2，全局钩子监听键盘消息应设为13
线程钩子监听鼠标消息应设为7，全局钩子监听鼠标消息应设为14

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定义数据结构///<summary>///声明键盘钩子的封送结构类型///</summary>[StructLayout(LayoutKind.Sequential)]publicclassKeyboardHookStruct{publicintvkCode;//表示一个1到254间的虚拟键盘码publicintscanCode;//表示硬件扫描码publicintflag
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