全局键鼠钩子类

• 2014年2月20日
• 作者 Bluedream
• 呆马

全局键鼠钩子类

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Imports System.Reflection, System.Threading, System.ComponentModel, System.Runtime.InteropServices

Public Class Hotkey

”’ <summary>本类可以在.NET环境下使用系统键盘与鼠标钩子</summary>
Public Class SystemHook

#Region “定义结构”

Private Structure MouseHookStruct
Dim PT As Point
Dim Hwnd As Integer
Dim WHitTestCode As Integer
Dim DwExtraInfo As Integer
End Structure

Private Structure MouseLLHookStruct
Dim PT As Point
Dim MouseData As Integer
Dim Flags As Integer
Dim Time As Integer
Dim DwExtraInfo As Integer
End Structure

Private Structure KeyboardHookStruct
Dim vkCode As Integer
Dim ScanCode As Integer
Dim Flags As Integer
Dim Time As Integer
Dim DwExtraInfo As Integer
End Structure

#End Region

#Region “API声明导入”

Private Declare Function SetWindowsHookEx Lib “user32” Alias “SetWindowsHookExA” (ByVal idHook As Integer, ByVal lpfn As HookProc, ByVal hMod As IntPtr, ByVal dwThreadId As Integer) As Integer
Private Declare Function UnhookWindowsHookEx Lib “user32” (ByVal idHook As Integer) As Integer
Private Declare Function CallNextHookEx Lib “user32” (ByVal idHook As Integer, ByVal nCode As Integer, ByVal wParam As Integer, ByVal lParam As IntPtr) As Integer
Private Declare Function ToAscii Lib “user32” (ByVal uVirtKey As Integer, ByVal uScancode As Integer, ByVal lpdKeyState As Byte(), ByVal lpwTransKey As Byte(), ByVal fuState As Integer) As Integer
Private Declare Function GetKeyboardState Lib “user32” (ByVal pbKeyState As Byte()) As Integer
Private Declare Function GetKeyState Lib “user32” (ByVal vKey As Integer) As Short

Private Delegate Function HookProc(ByVal nCode As Integer, ByVal wParam As Integer, ByVal lParam As IntPtr) As Integer

#End Region

#Region “常量声明”

Private Const WH_MOUSE_LL = 14
Private Const WH_KEYBOARD_LL = 13
Private Const WH_MOUSE = 7
Private Const WH_KEYBOARD = 2
Private Const WM_MOUSEMOVE = &H200
Private Const WM_LBUTTONDOWN = &H201
Private Const WM_RBUTTONDOWN = &H204
Private Const WM_MBUTTONDOWN = &H207
Private Const WM_LBUTTONUP = &H202
Private Const WM_RBUTTONUP = &H205
Private Const WM_MBUTTONUP = &H208
Private Const WM_LBUTTONDBLCLK = &H203
Private Const WM_RBUTTONDBLCLK = &H206
Private Const WM_MBUTTONDBLCLK = &H209
Private Const WM_MOUSEWHEEL = &H20A
Private Const WM_KEYDOWN = &H100
Private Const WM_KEYUP = &H101
Private Const WM_SYSKEYDOWN = &H104
Private Const WM_SYSKEYUP = &H105

Private Const VK_SHIFT As Byte = &H10
Private Const VK_CAPITAL As Byte = &H14
Private Const VK_NUMLOCK As Byte = &H90

#End Region

#Region “事件委托处理”

Private events As New System.ComponentModel.EventHandlerList

”’ <summary>鼠标激活事件</summary>
Public Custom Event MouseActivity As MouseEventHandler
AddHandler(ByVal value As MouseEventHandler)
events.AddHandler(“MouseActivity”, value)
End AddHandler
RemoveHandler(ByVal value As MouseEventHandler)
events.RemoveHandler(“MouseActivity”, value)
End RemoveHandler
RaiseEvent(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs)
Dim eh As MouseEventHandler = TryCast(events(“MouseActivity”), MouseEventHandler)
If eh IsNot Nothing Then eh.Invoke(sender, e)
End RaiseEvent
End Event
”’ <summary>键盘按下事件</summary>
Public Custom Event KeyDown As KeyEventHandler
AddHandler(ByVal value As KeyEventHandler)
events.AddHandler(“KeyDown”, value)
End AddHandler
RemoveHandler(ByVal value As KeyEventHandler)
events.RemoveHandler(“KeyDown”, value)
End RemoveHandler
RaiseEvent(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs)
Dim eh As KeyEventHandler = TryCast(events(“KeyDown”), KeyEventHandler)
If eh IsNot Nothing Then eh.Invoke(sender, e)
End RaiseEvent
End Event
”’ <summary>键盘输入事件</summary>
Public Custom Event KeyPress As KeyPressEventHandler
AddHandler(ByVal value As KeyPressEventHandler)
events.AddHandler(“KeyPress”, value)
End AddHandler
RemoveHandler(ByVal value As KeyPressEventHandler)
events.RemoveHandler(“KeyPress”, value)
End RemoveHandler
RaiseEvent(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs)
Dim eh As KeyPressEventHandler = TryCast(events(“KeyPress”), KeyPressEventHandler)
If eh IsNot Nothing Then eh.Invoke(sender, e)
End RaiseEvent
End Event
”’ <summary>键盘松开事件</summary>
Public Custom Event KeyUp As KeyEventHandler
AddHandler(ByVal value As KeyEventHandler)
events.AddHandler(“KeyUp”, value)
End AddHandler
RemoveHandler(ByVal value As KeyEventHandler)
events.RemoveHandler(“KeyUp”, value)
End RemoveHandler
RaiseEvent(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs)
Dim eh As KeyEventHandler = TryCast(events(“KeyUp”), KeyEventHandler)
If eh IsNot Nothing Then eh.Invoke(sender, e)
End RaiseEvent
End Event

#End Region

Private hMouseHook As Integer
Private hKeyboardHook As Integer

Private Shared MouseHookProcedure As HookProc
Private Shared KeyboardHookProcedure As HookProc

#Region “创建与析构类型”

”’ <summary>创建一个全局鼠标键盘钩子 (请使用Start方法开始监视)</summary>
Sub New()
‘留空即可
End Sub
”’ <summary>创建一个全局鼠标键盘钩子，决定是否安装钩子</summary>
”’ <param name=”InstallAll”>是否立刻挂钩系统消息</param>
Sub New(ByVal InstallAll As Boolean)
If InstallAll Then StartHook(True, True)
End Sub
”’ <summary>创建一个全局鼠标键盘钩子，并决定安装钩子的类型</summary>
”’ <param name=”InstallKeyboard”>挂钩键盘消息</param>
”’ <param name=”InstallMouse”>挂钩鼠标消息</param>
Sub New(ByVal InstallKeyboard As Boolean, ByVal InstallMouse As Boolean)
StartHook(InstallKeyboard, InstallMouse)
End Sub
”’ <summary>析构函数</summary>
Protected Overrides Sub Finalize()
UnHook() ‘卸载对象时反注册系统钩子
MyBase.Finalize()
End Sub

#End Region

”’ <summary>开始安装系统钩子</summary>
”’ <param name=”InstallKeyboardHook”>挂钩键盘消息</param>
”’ <param name=”InstallMouseHook”>挂钩鼠标消息</param>
Public Sub StartHook(Optional ByVal InstallKeyboardHook As Boolean = True, Optional ByVal InstallMouseHook As Boolean = False)
‘注册键盘钩子
If InstallKeyboardHook AndAlso hKeyboardHook = 0 Then
KeyboardHookProcedure = New HookProc(AddressOf KeyboardHookProc)
hKeyboardHook = SetWindowsHookEx(WH_KEYBOARD_LL, KeyboardHookProcedure, Marshal.GetHINSTANCE(Assembly.GetExecutingAssembly.GetModules()(0)), 0)
If hKeyboardHook = 0 Then ‘检测是否注册完成
UnHook(True, False) ‘在这里反注册
Throw New Win32Exception(Marshal.GetLastWin32Error) ‘报告错误
End If
End If
‘注册鼠标钩子
If InstallMouseHook AndAlso hMouseHook = 0 Then
MouseHookProcedure = New HookProc(AddressOf MouseHookProc)
hMouseHook = SetWindowsHookEx(WH_MOUSE_LL, MouseHookProcedure, Marshal.GetHINSTANCE(Assembly.GetExecutingAssembly.GetModules()(0)), 0)
If hMouseHook = 0 Then
UnHook(False, True)
Throw New Win32Exception(Marshal.GetLastWin32Error)
End If
End If
End Sub
”’ <summary>立刻卸载系统钩子</summary>
”’ <param name=”UninstallKeyboardHook”>卸载键盘钩子</param>
”’ <param name=”UninstallMouseHook”>卸载鼠标钩子</param>
”’ <param name=”ThrowExceptions”>是否报告错误</param>
Public Sub UnHook(Optional ByVal UninstallKeyboardHook As Boolean = True, Optional ByVal UninstallMouseHook As Boolean = True, Optional ByVal ThrowExceptions As Boolean = False)
‘卸载键盘钩子
If hKeyboardHook <> 0 AndAlso UninstallKeyboardHook Then
Dim retKeyboard As Integer = UnhookWindowsHookEx(hKeyboardHook)
hKeyboardHook = 0
If ThrowExceptions AndAlso retKeyboard = 0 Then ‘如果出现错误，是否报告错误
Throw New Win32Exception(Marshal.GetLastWin32Error) ‘报告错误
End If
End If
‘卸载鼠标钩子
If hMouseHook <> 0 AndAlso UninstallMouseHook Then
Dim retMouse As Integer = UnhookWindowsHookEx(hMouseHook)
hMouseHook = 0
If ThrowExceptions AndAlso retMouse = 0 Then
Throw New Win32Exception(Marshal.GetLastWin32Error)
End If
End If
End Sub

‘键盘消息的委托处理代码
Private Function KeyboardHookProc(ByVal nCode As Integer, ByVal wParam As Integer, ByVal lParam As IntPtr) As Integer
Static handled As Boolean : handled = False
If nCode >= 0 AndAlso (events(“KeyDown”) IsNot Nothing OrElse events(“KeyPress”) IsNot Nothing OrElse events(“KeyUp”) IsNot Nothing) Then
Static MyKeyboardHookStruct As KeyboardHookStruct
MyKeyboardHookStruct = DirectCast(Marshal.PtrToStructure(lParam, GetType(KeyboardHookStruct)), KeyboardHookStruct)
‘激活KeyDown
If wParam = WM_KEYDOWN OrElse wParam = WM_SYSKEYDOWN Then ‘如果消息为按下普通键或系统键
Dim e As New KeyEventArgs(MyKeyboardHookStruct.vkCode)
RaiseEvent KeyDown(Me, e) ‘激活事件
handled = handled Or e.Handled ‘是否取消下一个钩子
End If
‘激活KeyUp
If wParam = WM_KEYUP OrElse wParam = WM_SYSKEYUP Then
Dim e As New KeyEventArgs(MyKeyboardHookStruct.vkCode)
RaiseEvent KeyUp(Me, e)
handled = handled Or e.Handled
End If
‘激活KeyPress (TODO:此段代码还有BUG！)
If wParam = WM_KEYDOWN Then
Dim isDownShift As Boolean = (GetKeyState(VK_SHIFT) & &H80 = &H80)
Dim isDownCapslock As Boolean = (GetKeyState(VK_CAPITAL) <> 0)
Dim keyState(256) As Byte
GetKeyboardState(keyState)
Dim inBuffer(2) As Byte
If ToAscii(MyKeyboardHookStruct.vkCode, MyKeyboardHookStruct.ScanCode, keyState, inBuffer, MyKeyboardHookStruct.Flags) = 1 Then
Static key As Char : key = Chr(inBuffer(0))
‘ BUG所在
‘If isDownCapslock Xor isDownShift And Char.IsLetter(key) Then
‘    key = Char.ToUpper(key)
‘End If
Dim e As New KeyPressEventArgs(key)
RaiseEvent KeyPress(Me, e)
handled = handled Or e.Handled
End If
End If
‘取消或者激活下一个钩子
If handled Then Return 1 Else Return CallNextHookEx(hKeyboardHook, nCode, wParam, lParam)
End If
End Function
‘鼠标消息的委托处理代码
Private Function MouseHookProc(ByVal nCode As Integer, ByVal wParam As Integer, ByVal lParam As IntPtr) As Integer
If nCode >= 0 AndAlso events(“MouseActivity”) IsNot Nothing Then
Static mouseHookStruct As MouseLLHookStruct
mouseHookStruct = DirectCast(Marshal.PtrToStructure(lParam, GetType(MouseLLHookStruct)), MouseLLHookStruct)
Static moubut As MouseButtons : moubut = MouseButtons.None ‘鼠标按键
Static mouseDelta As Integer : mouseDelta = 0 ‘滚轮值
Select Case wParam
Case WM_LBUTTONDOWN
moubut = MouseButtons.Left
Case WM_RBUTTONDOWN
moubut = MouseButtons.Right
Case WM_MBUTTONDOWN
moubut = MouseButtons.Middle
Case WM_MOUSEWHEEL                        Static int As Integer : int = (mouseHookStruct.MouseData >> 16) And &HFFFF
‘本段代码CLE添加，模仿C#的Short从Int弃位转换
If int > Short.MaxValue Then mouseDelta = int – 65536 Else mouseDelta = int
End Select
Static clickCount As Integer : clickCount = 0 ‘单击次数
If moubut <> MouseButtons.None Then
If wParam = WM_LBUTTONDBLCLK OrElse wParam = WM_RBUTTONDBLCLK OrElse wParam = WM_MBUTTONDBLCLK Then
clickCount = 2
Else
clickCount = 1
End If
End If
Dim e As New MouseEventArgs(moubut, clickCount, mouseHookStruct.PT.X, mouseHookStruct.PT.Y, mouseDelta)
RaiseEvent MouseActivity(Me, e)
End If
Return CallNextHookEx(hMouseHook, nCode, wParam, lParam) ‘激活下一个钩子
End Function

”’ <summary>键盘钩子是否有效</summary>
Public Property KeyHookEnabled() As Boolean
Get
Return hKeyboardHook <> 0
End Get
Set(ByVal value As Boolean)
If value Then StartHook(True, False) Else UnHook(True, False)
End Set
End Property
”’ <summary>鼠标钩子是否有效</summary>
Public Property MouseHookEnabled() As Boolean
Get
Return hMouseHook <> 0
End Get
Set(ByVal value As Boolean)
If value Then StartHook(False, True) Else UnHook(False, True)
End Set
End Property

End Class
End Class