如果有人需要，这里是该课程的完整来源：
用法示例：
dim withevents hook as new mousehook(install:=true)
' then subscribe to the desired events...
hook.uninstall ' calls the finalizer
（由于 StackOverflow 的字符长度限制，我需要删除一些有用的 XML 文档）
' ***********************************************************************
' Author : Elektro
' Last Modified On : 09-26-2014
' ***********************************************************************
#Region " Instructions "
' Go to page:
' Project > Properties > Debug
'
' Then uncheck the option:
' "Enable the Visual Studio Hosting Process"
#End Region
#Region " Imports "
Imports System.ComponentModel
Imports System.Reflection
Imports System.Runtime.InteropServices
#End Region
#Region " MouseHook "
''' <summary>
''' A low level mouse hook that processes mouse input events.
''' </summary>
Friend NotInheritable Class MouseHook : Implements IDisposable
#Region " P/Invoke "
''' <summary>
''' Platform Invocation methods (P/Invoke), access unmanaged code.
''' This class does not suppress stack walks for unmanaged code permission.
''' <see cref="System.Security.SuppressUnmanagedCodeSecurityAttribute"/> must not be applied to this class.
''' This class is for methods that can be used anywhere because a stack walk will be performed.
''' MSDN Documentation: http://msdn.microsoft.com/en-us/library/ms182161.aspx
''' </summary>
Protected NotInheritable Class NativeMethods
#Region " Methods "
<DllImport("user32.dll", CallingConvention:=CallingConvention.StdCall, CharSet:=CharSet.Auto)>
Friend Shared Function CallNextHookEx(
ByVal idHook As IntPtr,
ByVal nCode As Integer,
ByVal wParam As IntPtr,
ByVal lParam As IntPtr
) As IntPtr
End Function
<DllImport("user32.dll", CallingConvention:=CallingConvention.StdCall, CharSet:=CharSet.Auto)>
Friend Shared Function SetWindowsHookEx(
ByVal idHook As HookType,
ByVal lpfn As LowLevelMouseProcDelegate,
ByVal hInstance As IntPtr,
ByVal threadId As UInteger
) As IntPtr
End Function
<DllImport("user32.dll", CallingConvention:=CallingConvention.StdCall, CharSet:=CharSet.Auto)>
Friend Shared Function UnhookWindowsHookEx(
ByVal idHook As IntPtr
) As Boolean
End Function
''' <summary>
''' Retrieves the current double-click time for the mouse.
''' A double-click is a series of two clicks of the mouse button,
''' the second occurring within a specified time after the first.
''' The double-click time is the maximum number of milliseconds that may occur
''' between the first and second click of a double-click.
''' The maximum double-click time is 5000 milliseconds.
''' </summary>
''' <returns>
''' The return value specifies the current double-click time, in milliseconds.
''' The maximum return value is 5000 milliseconds.
''' </returns>
<DllImport("user32.dll", CharSet:=CharSet.Auto)>
Friend Shared Function GetDoubleClickTime() As Integer
End Function
#End Region
#Region " Enumerations "
''' <summary>
''' Indicates a type of Hook procedure to be installed.
''' MSDN Documentation: http://msdn.microsoft.com/en-us/library/windows/desktop/ms644990%28v=vs.85%29.aspx
''' </summary>
<Description("Enum used in 'idHook' parameter of 'SetWindowsHookEx' function.")>
Friend Enum HookType As UInteger
' **************************************
' This enumeration is partially defined.
' **************************************
''' <summary>
''' Installs a hook procedure that monitors low-level mouse input events.
''' For more information, see the LowLevelMouseProc hook procedure.
''' </summary>
WH_MOUSE_LL = 14UI
End Enum
''' <summary>
''' The event-injected flags.
''' An application can use the following values to test the flags.
''' Testing LLMHF_INJECTED (bit 0) will tell you whether the event was injected.
''' If it was, then testing LLMHF_LOWER_IL_INJECTED (bit 1) will tell you
''' whether or not the event was injected from a process running at lower integrity level.
''' </summary>
<Flags()>
<Description("Enum used in 'flags' parameter of 'MSLLHOOKSTRUCT' structure.")>
Public Enum MSLLHOOKSTRUCTFlags As Integer
''' <summary>
''' Test the event-injected (from any process) flag.
''' </summary>
LLMHF_INJECTED = 1
''' <summary>
''' Test the event-injected (from a process running at lower integrity level) flag.
''' </summary>
LLMHF_LOWER_IL_INJECTED = 2
End Enum
#End Region
#Region " Structures "
''' <summary>
''' The POINT structure defines the x- and y- coordinates of a point.
''' MSDN Documentation: http://msdn.microsoft.com/en-us/library/windows/desktop/dd162805%28v=vs.85%29.aspx
''' </summary>
<Description("Structure used in 'pt' parameter of 'MSLLHOOKSTRUCT' structure.")>
<StructLayout(LayoutKind.Sequential)>
Friend Structure POINT
''' <summary>
''' The x-coordinate of the point.
''' </summary>
Public X As Integer
''' <summary>
''' The y-coordinate of the point.
''' </summary>
Public Y As Integer
End Structure
''' <summary>
''' Contains information about a low-level mouse input event.
''' MSDN Documentation: http://msdn.microsoft.com/en-us/library/windows/desktop/ms644970%28v=vs.85%29.aspx
''' </summary>
<Description("Structure used in 'lParam' parameter of 'CallNextHookEx' function.")>
Friend Structure MSLLHOOKSTRUCT
''' <summary>
''' The ptThe x- and y-coordinates of the cursor, in screen coordinates.
''' </summary>
Friend pt As NativeMethods.POINT
''' <summary>
''' If the message is 'WM_MOUSEWHEEL', the high-order word of this member is the wheel delta.
''' The low-order word is reserved.
''' A positive value indicates that the wheel was rotated forward, away from the user;
''' a negative value indicates that the wheel was rotated backward, toward the user.
''' One wheel click is defined as 'WHEEL_DELTA', which is '120'.
''' </summary>
Friend mouseData As Integer
''' <summary>
''' The event-injected flag.
''' </summary>
Friend flags As MSLLHOOKSTRUCTFlags
''' <summary>
''' The time stamp for this message.
''' </summary>
Friend time As UInteger
''' <summary>
''' Additional information associated with the message.
''' </summary>
Friend dwExtraInfo As IntPtr
End Structure
#End Region
#Region " Delegates "
''' <summary>
''' Delegate LowLevelMouseProc
''' MSDN Documentation: http://msdn.microsoft.com/en-us/library/windows/desktop/ms644986%28v=vs.85%29.aspx
''' </summary>
''' <returns>
''' If nCode is less than zero, the hook procedure must return the value returned by CallNextHookEx.
''' If nCode is greater than or equal to zero, and the hook procedure did not process the message,
''' it is highly recommended that you call CallNextHookEx and return the value it returns;
''' otherwise, other applications that have installed WH_MOUSE_LL hooks will not receive hook notifications
''' and may behave incorrectly as a result.
''' If the hook procedure processed the message,
''' it may return a nonzero value to prevent the system from passing the message to the rest of the hook chain or the target window procedure.
''' </returns>
Friend Delegate Function LowLevelMouseProcDelegate(
ByVal nCode As IntPtr,
ByVal wParam As IntPtr,
ByVal lParam As IntPtr
) As Integer
#End Region
#Region " Hidden Methods "
''' <summary>
''' Determines whether the specified System.Object instances are considered equal.
''' </summary>
<EditorBrowsable(EditorBrowsableState.Never)>
Public Shadows Sub Equals()
End Sub
''' <summary>
''' Determines whether the specified System.Object instances are the same instance.
''' </summary>
<EditorBrowsable(EditorBrowsableState.Never)>
Private Shadows Sub ReferenceEquals()
End Sub
#End Region
End Class
#End Region
#Region " Objects "
''' <summary>
''' Handle to the hook procedure.
''' </summary>
Private MouseHook As IntPtr
''' <summary>
''' The mouse hook delegate.
''' </summary>
Private MouseHookDelegate As NativeMethods.LowLevelMouseProcDelegate
#End Region
#Region " Properties "
''' <summary>
''' ** ONLY FOR TESTING PURPOSES **
''' Gets or sets a value indicating whether to suppress the last MouseUp event of
''' the specified clicked button when a double-click fires.
'''
''' If this value is set to <c>true</c>, the application will send the events in this order for a Double-Click:
''' MouseDown, MouseUp, MouseDown, MouseDoubleClick
'''
''' If this value is set to <c>false</c>, the application will send the events in this order for a Double-Click:
''' MouseDown, MouseUp, MouseDown, MouseUp, MouseDoubleClick
'''
''' </summary>
''' <value><c>true</c> if MouseUp event is suppressed; otherwise <c>false</c>.</value>
Friend Property SuppressMouseUpEventWhenDoubleClick As Boolean = False
#End Region
#Region " Enumerations "
''' <summary>
''' Indicates a Windows Message related to a mouse events.
''' For more info see here:
''' http://msdn.microsoft.com/en-us/library/windows/desktop/ff468877%28v=vs.85%29.aspx
''' </summary>
Private Enum MouseMessages As UInteger
''' <summary>
''' Posted to a window when the cursor moves.
''' If the mouse is not captured, the message is posted to the window that contains the cursor.
''' Otherwise, the message is posted to the window that has captured the mouse
''' </summary>
WM_MOUSEMOVE = &H200UI
''' <summary>
''' Posted when the user presses the left mouse button while the cursor is in the client area of a window.
''' If the mouse is not captured, the message is posted to the window beneath the cursor.
''' Otherwise, the message is posted to the window that has captured the mouse
''' </summary>
WM_LBUTTONDOWN = &H201UI
''' <summary>
''' Posted when the user releases the left mouse button while the cursor is in the client area of a window.
''' If the mouse is not captured, the message is posted to the window beneath the cursor.
''' Otherwise, the message is posted to the window that has captured the mouse
''' </summary>
WM_LBUTTONUP = &H202UI
''' <summary>
''' Posted when the user presses the right mouse button while the cursor is in the client area of a window.
''' If the mouse is not captured, the message is posted to the window beneath the cursor.
''' Otherwise, the message is posted to the window that has captured the mouse
''' </summary>
WM_RBUTTONDOWN = &H204UI
''' <summary>
''' Posted when the user releases the right mouse button while the cursor is in the client area of a window.
''' If the mouse is not captured, the message is posted to the window beneath the cursor.
''' Otherwise, the message is posted to the window that has captured the mouse
''' </summary>
WM_RBUTTONUP = &H205UI
''' <summary>
''' Posted when the user presses the middle mouse button while the cursor is in the client area of a window.
''' If the mouse is not captured, the message is posted to the window beneath the cursor.
''' Otherwise, the message is posted to the window that has captured the mouse
''' </summary>
WM_MBUTTONDOWN = &H207UI
''' <summary>
''' Posted when the user releases the middle mouse button while the cursor is in the client area of a window.
''' If the mouse is not captured, the message is posted to the window beneath the cursor.
''' Otherwise, the message is posted to the window that has captured the mouse
''' </summary>
WM_MBUTTONUP = &H208UI
''' <summary>
''' Sent to the active window when the mouse's horizontal scroll wheel is tilted or rotated.
''' The DefWindowProc function propagates the message to the window's parent.
''' There should be no internal forwarding of the message,
''' since DefWindowProc propagates it up the parent chain until it finds a window that processes it.
''' </summary>
WM_MOUSEWHEEL = &H20AUI
End Enum
''' <summary>
''' Indicates the whell direction of the mouse.
''' </summary>
Public Enum WheelDirection As Integer
''' <summary>
''' The wheel is moved up.
''' </summary>
WheelUp = 1
''' <summary>
''' The wheel is moved down.
''' </summary>
WheelDown = 2
End Enum
#End Region
#Region " Events "
''' <summary>
''' Occurs when the mouse moves.
''' </summary>
Friend Event MouseMove(ByVal sender As Object,
ByVal MouseLocation As Point)
''' <summary>
''' Occurs when the mouse left button is pressed.
''' </summary>
Friend Event MouseLeftDown(ByVal sender As Object,
ByVal MouseLocation As Point)
''' <summary>
''' Occurs when the mouse left button is released.
''' </summary>
Friend Event MouseLeftUp(ByVal sender As Object,
ByVal MouseLocation As Point)
''' <summary>
''' Occurs when the mouse left button performs a double-click.
''' A double click is considered as: (MouseLeftDown + MouseLeftUp) * 2
''' </summary>
Friend Event MouseLeftDoubleClick(ByVal sender As Object,
ByVal MouseLocation As Point)
''' <summary>
''' Occurs when the mouse right button is pressed.
''' </summary>
Friend Event MouseRightDown(ByVal sender As Object,
ByVal MouseLocation As Point)
''' <summary>
''' Occurs when the mouse right button is released.
''' </summary>
Friend Event MouseRightUp(ByVal sender As Object,
ByVal MouseLocation As Point)
''' <summary>
''' Occurs when the mouse right button performs a double-click.
''' A double click is considered as: (MouseLeftDown + MouseLeftUp) * 2
''' </summary>
Friend Event MouseRightDoubleClick(ByVal sender As Object,
ByVal MouseLocation As Point)
''' <summary>
''' Occurs when the mouse middle button is pressed.
''' </summary>
Friend Event MouseMiddleDown(ByVal sender As Object,
ByVal MouseLocation As Point)
''' <summary>
''' Occurs when the mouse middle button is released.
''' </summary>
Friend Event MouseMiddleUp(ByVal sender As Object,
ByVal MouseLocation As Point)
''' <summary>
''' Occurs when the mouse middle button performs a double-click.
''' A double click is considered as: (MouseLeftDown + MouseLeftUp) * 2
''' </summary>
Friend Event MouseMiddleDoubleClick(ByVal sender As Object,
ByVal MouseLocation As Point)
''' <summary>
''' Occurs when the mouse wheel is moved up or down.
''' </summary>
Friend Event MouseWheel(ByVal sender As Object,
ByVal MouseLocation As Point,
ByVal WheelDirection As WheelDirection)
#End Region
#Region " Constructors "
''' <summary>
''' Prevents a default instance of the <see cref="MouseHook"/> class from being created.
''' </summary>
Private Sub New()
End Sub
''' <summary>
''' Initializes a new instance of the <see cref="MouseHook"/> class.
''' </summary>
''' <param name="Install">
''' If set to <c>true</c>, the Hook starts initialized for this <see cref="MouseHook"/> instance.
''' </param>
Friend Sub New(Optional ByVal Install As Boolean = False)
If Install Then
Me.Install()
End If
End Sub
#End Region
#Region " Public Methods "
''' <summary>
''' Installs the Mouse Hook, then start processing messages to fire events.
''' </summary>
Friend Sub Install()
Me.MouseHookDelegate = New NativeMethods.LowLevelMouseProcDelegate(AddressOf LowLevelMouseProc)
Try
Me.MouseHook = NativeMethods.SetWindowsHookEx(NativeMethods.HookType.WH_MOUSE_LL,
Me.MouseHookDelegate,
Marshal.GetHINSTANCE(Assembly.GetExecutingAssembly.GetModules()(0)).ToInt32, 0)
Catch ex As Exception
Throw
End Try
End Sub
''' <summary>
''' Uninstalls the Mouse Hook and free all resources, then stop processing messages to fire events.
''' </summary>
Friend Sub Uninstall()
Me.Finalize()
End Sub
#End Region
#Region " Private Methods "
Private Function LowLevelMouseProc(ByVal nCode As Integer,
ByVal wParam As MouseMessages,
ByVal lParam As IntPtr) As Integer
Static LeftClickTime As Integer = 0I ' Determines a left button double-click.
Static RightClickTime As Integer = 0I ' Determines a right button double-click.
Static MiddleClickTime As Integer = 0I ' Determines a middle button double-click.
If nCode = 0I Then
Dim x As Integer = 0
Dim y As Integer = 0
Dim MouseStruct As NativeMethods.MSLLHOOKSTRUCT
MouseStruct = CType(Marshal.PtrToStructure(lParam, MouseStruct.GetType()),
NativeMethods.MSLLHOOKSTRUCT)
' Fix X coordinate.
Select Case MouseStruct.pt.X
Case Is < 0I
x = 0I
Case Is > SystemInformation.VirtualScreen.Width
x = SystemInformation.VirtualScreen.Width
Case Else
x = MouseStruct.pt.X
End Select
' Fix Y coordinate.
Select Case MouseStruct.pt.Y
Case Is > SystemInformation.VirtualScreen.Height
y = SystemInformation.VirtualScreen.Height
Case Is < 0I
y = 0I
Case Else
y = MouseStruct.pt.Y
End Select
Select Case wParam
Case MouseMessages.WM_MOUSEMOVE
RaiseEvent MouseMove(Me, New Point(x, y))
Case MouseMessages.WM_LBUTTONDOWN
RaiseEvent MouseLeftDown(Me, New Point(x, y))
Case MouseMessages.WM_LBUTTONUP
If LeftClickTime <> 0 Then
LeftClickTime = Environment.TickCount() - LeftClickTime
End If
If (LeftClickTime <> 0) AndAlso (LeftClickTime < NativeMethods.GetDoubleClickTime()) Then
LeftClickTime = 0
If Not Me.SuppressMouseUpEventWhenDoubleClick Then
RaiseEvent MouseLeftUp(Me, New Point(x, y))
End If
RaiseEvent MouseLeftDoubleClick(Me, New Point(x, y))
Else
LeftClickTime = Environment.TickCount()
RaiseEvent MouseLeftUp(Me, New Point(x, y))
End If
Case MouseMessages.WM_RBUTTONDOWN
RaiseEvent MouseRightDown(Me, New Point(x, y))
Case MouseMessages.WM_RBUTTONUP
If RightClickTime <> 0 Then
RightClickTime = Environment.TickCount() - RightClickTime
End If
If (RightClickTime <> 0) AndAlso (RightClickTime < NativeMethods.GetDoubleClickTime()) Then
RightClickTime = 0
If Not Me.SuppressMouseUpEventWhenDoubleClick Then
RaiseEvent MouseRightUp(Me, New Point(x, y))
End If
RaiseEvent MouseRightDoubleClick(Me, New Point(x, y))
Else
RightClickTime = Environment.TickCount()
RaiseEvent MouseRightUp(Me, New Point(x, y))
End If
Case MouseMessages.WM_MBUTTONDOWN
RaiseEvent MouseMiddleDown(Me, New Point(x, y))
Case MouseMessages.WM_MBUTTONUP
If MiddleClickTime <> 0 Then
MiddleClickTime = Environment.TickCount() - MiddleClickTime
End If
If (MiddleClickTime <> 0) AndAlso (MiddleClickTime < NativeMethods.GetDoubleClickTime()) Then
MiddleClickTime = 0
If Not Me.SuppressMouseUpEventWhenDoubleClick Then
RaiseEvent MouseMiddleUp(Me, New Point(x, y))
End If
RaiseEvent MouseMiddleDoubleClick(Me, New Point(x, y))
Else
MiddleClickTime = Environment.TickCount()
RaiseEvent MouseMiddleUp(Me, New Point(x, y))
End If
Case MouseMessages.WM_MOUSEWHEEL
RaiseEvent MouseWheel(Me, New Point(x, y), If(MouseStruct.mouseData < 0,
WheelDirection.WheelDown,
WheelDirection.WheelUp))
Case Else
Exit Select ' Do Nothing
End Select
Return 0
ElseIf nCode < 0I Then
Return NativeMethods.CallNextHookEx(MouseHook, nCode, wParam, lParam)
Else ' nCode > 0
Return -1I
End If
End Function
#End Region
#Region " Hidden Methods "
''' <summary>
''' Serves as a hash function for a particular type.
''' </summary>
<EditorBrowsable(EditorBrowsableState.Never)>
Public Shadows Sub GetHashCode()
End Sub
''' <summary>
''' Gets the System.Type of the current instance.
''' </summary>
''' <returns>The exact runtime type of the current instance.</returns>
<EditorBrowsable(EditorBrowsableState.Never)>
Public Shadows Function [GetType]()
Return Me.GetType
End Function
''' <summary>
''' Determines whether the specified System.Object instances are considered equal.
''' </summary>
<EditorBrowsable(EditorBrowsableState.Never)>
Public Shadows Sub Equals()
End Sub
''' <summary>
''' Determines whether the specified System.Object instances are the same instance.
''' </summary>
<EditorBrowsable(EditorBrowsableState.Never)>
Private Shadows Sub ReferenceEquals()
End Sub
''' <summary>
''' Returns a String that represents the current object.
''' </summary>
<EditorBrowsable(EditorBrowsableState.Never)>
Public Shadows Sub ToString()
End Sub
#End Region
#Region "IDisposable Support"
''' <summary>
''' Flag to detect redundant calls at <see cref="Dispose"/> method.
''' </summary>
Private disposedValue As Boolean
''' <summary>
''' Releases unmanaged and optionally managed resources.
''' </summary>
''' <param name="disposing">
''' <c>true</c> to release both managed and unmanaged resources;
''' <c>false</c> to release only unmanaged resources.
''' </param>
Protected Sub Dispose(ByVal disposing As Boolean)
If Not Me.disposedValue Then
If disposing Then ' Dispose managed state (managed objects).
Else ' Free unmanaged resources (unmanaged objects).
NativeMethods.UnhookWindowsHookEx(Me.MouseHook)
End If
End If
Me.disposedValue = True
End Sub
''' <summary>
''' Allows an object to try to free resources
''' and perform other cleanup operations before it is reclaimed by garbage collection.
''' </summary>
Protected Overrides Sub Finalize()
' Do not change this code. Put cleanup code in method: Dispose(ByVal disposing As Boolean)
Me.Dispose(disposing:=False)
MyBase.Finalize()
End Sub
''' <summary>
''' Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
''' </summary>
Private Sub Dispose() Implements IDisposable.Dispose
' Do not change this code. Put cleanup code in method: Dispose(ByVal disposing As Boolean)
Me.Dispose(disposing:=True)
GC.SuppressFinalize(obj:=Me)
End Sub
#End Region
End Class
#End Region