我有问题要问。
我有一个用于读取和写入USB数据的dll文件。 要在VB.Net中使用dll，需要集成一个接口的.vb文件 该DLL文件使用其功能，属性等。
我需要的是在C＃项目中使用这个dll。这可能吗？ 如果是的话，我该如何实现呢？
表格中的代码类：
Public Class frmUSB
' vendor and product IDs
Private Const VendorID As Integer = &H1234 'Replace with your device's
Private Const ProductID As Integer = &H1234 'product and vendor IDs
' read and write buffers
Private Const BufferInSize As Integer = 1 'Size of the data buffer coming IN to the PC
Private Const BufferOutSize As Integer = 1 'Size of the data buffer going OUT from the PC
Dim BufferIn(BufferInSize) As Byte 'Received data will be stored here - the first byte in the array is unused
Dim BufferOut(BufferOutSize) As Byte 'Transmitted data is stored here - the first item in the array must be 0
' ****************************************************************
' when the form loads, connect to the HID controller - pass
' the form window handle so that you can receive notification
' events...
'*****************************************************************
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
' do not remove!
ConnectToHID(Me)
End Sub
'*****************************************************************
' disconnect from the HID controller...
'*****************************************************************
Private Sub Form1_FormClosed(ByVal sender As Object, ByVal e As System.Windows.Forms.FormClosedEventArgs) Handles Me.FormClosed
DisconnectFromHID()
End Sub
'*****************************************************************
' a HID device has been plugged in...
'*****************************************************************
Public Sub OnPlugged(ByVal pHandle As Integer)
If hidGetVendorID(pHandle) = VendorID And hidGetProductID(pHandle) = ProductID Then
' ** YOUR CODE HERE **
End If
End Sub
'*****************************************************************
' a HID device has been unplugged...
'*****************************************************************
Public Sub OnUnplugged(ByVal pHandle As Integer)
If hidGetVendorID(pHandle) = VendorID And hidGetProductID(pHandle) = ProductID Then
hidSetReadNotify(hidGetHandle(VendorID, ProductID), False)
' ** YOUR CODE HERE **
End If
End Sub
'*****************************************************************
' controller changed notification - called
' after ALL HID devices are plugged or unplugged
'*****************************************************************
Public Sub OnChanged()
' get the handle of the device we are interested in, then set
' its read notify flag to true - this ensures you get a read
' notification message when there is some data to read...
Dim pHandle As Integer
pHandle = hidGetHandle(VendorID, ProductID)
hidSetReadNotify(hidGetHandle(VendorID, ProductID), True)
End Sub
'*****************************************************************
' on read event...
'*****************************************************************
Public Sub OnRead(ByVal pHandle As Integer)
' read the data (don't forget, pass the whole array)...
If hidRead(pHandle, BufferIn(0)) Then
TextBox1.Text = Str(BufferIn(1))
' ** YOUR CODE HERE **
' first byte is the report ID, e.g. BufferIn(0)
' the other bytes are the data from the microcontroller...
End If
End Sub
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
BufferOut(1) = Val(TextBox2.Text)
hidWriteEx(VendorID, ProductID, BufferOut(0))
End Sub
End Class
我可以使用什么来将表单实例发送到HIDDLLInterface （与我相关的关键字）？
接口类代码如下：
进口系统 进口System.Threading Imports System.Runtime.InteropServices
Module HIDDLLInterface
' this is the interface to the HID controller DLL - you should not
' normally need to change anything in this file.
'
' WinProc() calls your main form 'event' procedures - these are currently
' set to..
'
' MainForm.OnPlugged(ByVal pHandle as long)
' MainForm.OnUnplugged(ByVal pHandle as long)
' MainForm.OnChanged()
' MainForm.OnRead(ByVal pHandle as long)
' HID interface API declarations...
Declare Function hidConnect Lib "mcHID.dll" Alias "Connect" (ByVal pHostWin As Integer) As Boolean
Declare Function hidDisconnect Lib "mcHID.dll" Alias "Disconnect" () As Boolean
Declare Function hidGetItem Lib "mcHID.dll" Alias "GetItem" (ByVal pIndex As Integer) As Integer
Declare Function hidGetItemCount Lib "mcHID.dll" Alias "GetItemCount" () As Integer
Declare Function hidRead Lib "mcHID.dll" Alias "Read" (ByVal pHandle As Integer, ByRef pData As Byte) As Boolean
Declare Function hidWrite Lib "mcHID.dll" Alias "Write" (ByVal pHandle As Integer, ByRef pData As Byte) As Boolean
Declare Function hidReadEx Lib "mcHID.dll" Alias "ReadEx" (ByVal pVendorID As Integer, ByVal pProductID As Integer, ByRef pData As Byte) As Boolean
Declare Function hidWriteEx Lib "mcHID.dll" Alias "WriteEx" (ByVal pVendorID As Integer, ByVal pProductID As Integer, ByRef pData As Byte) As Boolean
Declare Function hidGetHandle Lib "mcHID.dll" Alias "GetHandle" (ByVal pVendoID As Integer, ByVal pProductID As Integer) As Integer
Declare Function hidGetVendorID Lib "mcHID.dll" Alias "GetVendorID" (ByVal pHandle As Integer) As Integer
Declare Function hidGetProductID Lib "mcHID.dll" Alias "GetProductID" (ByVal pHandle As Integer) As Integer
Declare Function hidGetVersion Lib "mcHID.dll" Alias "GetVersion" (ByVal pHandle As Integer) As Integer
Declare Function hidGetVendorName Lib "mcHID.dll" Alias "GetVendorName" (ByVal pHandle As Integer, ByVal pText As String, ByVal pLen As Integer) As Integer
Declare Function hidGetProductName Lib "mcHID.dll" Alias "GetProductName" (ByVal pHandle As Integer, ByVal pText As String, ByVal pLen As Integer) As Integer
Declare Function hidGetSerialNumber Lib "mcHID.dll" Alias "GetSerialNumber" (ByVal pHandle As Integer, ByVal pText As String, ByVal pLen As Integer) As Integer
Declare Function hidGetInputReportLength Lib "mcHID.dll" Alias "GetInputReportLength" (ByVal pHandle As Integer) As Integer
Declare Function hidGetOutputReportLength Lib "mcHID.dll" Alias "GetOutputReportLength" (ByVal pHandle As Integer) As Integer
Declare Sub hidSetReadNotify Lib "mcHID.dll" Alias "SetReadNotify" (ByVal pHandle As Integer, ByVal pValue As Boolean)
Declare Function hidIsReadNotifyEnabled Lib "mcHID.dll" Alias "IsReadNotifyEnabled" (ByVal pHandle As Integer) As Boolean
Declare Function hidIsAvailable Lib "mcHID.dll" Alias "IsAvailable" (ByVal pVendorID As Integer, ByVal pProductID As Integer) As Boolean
' windows API declarations - used to set up messaging...
Public Declare Function CallWindowProc Lib "user32" Alias "CallWindowProcA" (ByVal lpPrevWndFunc As Integer, ByVal hwnd As Integer, ByVal Msg As Integer, ByVal wParam As Integer, ByVal lParam As Integer) As Integer
Public Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA" _
(ByVal hwnd As Integer, ByVal nIndex As Integer, ByVal dwNewLong As Integer) As Integer
Delegate Function SubClassProcDelegate(ByVal hwnd As Integer, ByVal msg As Integer, ByVal wParam As Integer, ByVal lParam As Integer) As Integer
Public Declare Function DelegateSetWindowLong Lib "USER32.DLL" Alias "SetWindowLongA" _
(ByVal hwnd As Integer, ByVal attr As Integer, ByVal lval As SubClassProcDelegate) As Integer
' windows API Constants
Public Const WM_APP As Integer = 32768
Public Const GWL_WNDPROC As Short = -4
' HID message constants
Private Const WM_HID_EVENT As Decimal = WM_APP + 200
Private Const NOTIFY_PLUGGED As Short = 1
Private Const NOTIFY_UNPLUGGED As Short = 2
Private Const NOTIFY_CHANGED As Short = 3
Private Const NOTIFY_READ As Short = 4
' local variables
Private FPrevWinProc As Integer ' Handle to previous window procedure
Private FWinHandle As Integer ' Handle to message window
Private Ref_WinProc As New SubClassProcDelegate(AddressOf WinProc)
Private HostForm As Object
' Set up a windows hook to receive notification
' messages from the HID controller DLL - then connect
' to the controller
Public Function ConnectToHID(ByRef targetForm As Form) As Boolean
Dim pHostWin As Integer = targetForm.Handle.ToInt32
FWinHandle = pHostWin
pHostWin = hidConnect(FWinHandle)
FPrevWinProc = DelegateSetWindowLong(FWinHandle, GWL_WNDPROC, Ref_WinProc)
HostForm = targetForm
End Function
' Unhook from the HID controller and disconnect...
Public Function DisconnectFromHID() As Boolean
DisconnectFromHID = hidDisconnect
SetWindowLong(FWinHandle, GWL_WNDPROC, FPrevWinProc)
End Function
' This is the procedure that intercepts the HID controller messages...
Private Function WinProc(ByVal pHWnd As Integer, ByVal pMsg As Integer, ByVal wParam As Integer, ByVal lParam As Integer) As Integer
If pMsg = WM_HID_EVENT Then
Select Case wParam
' HID device has been plugged message...
Case Is = NOTIFY_PLUGGED
HostForm.OnPlugged(lParam)
' HID device has been unplugged
Case Is = NOTIFY_UNPLUGGED
HostForm.OnUnplugged(lParam)
' controller has changed...
Case Is = NOTIFY_CHANGED
HostForm.OnChanged()
' read event...
Case Is = NOTIFY_READ
HostForm.OnRead(lParam)
End Select
End If
' next...
WinProc = CallWindowProc(FPrevWinProc, pHWnd, pMsg, wParam, lParam)
End Function
End Module
答案 0 :(得分：5)
假设VB.NET代码为CLS compliant，您只需在C＃项目中添加对它的引用即可。
此时，DLL中的命名空间和所有公共成员都可以使用C＃代码。
答案 1 :(得分：2)
您的设计中存在耦合问题。为了解决这个问题，我建议如下：
HIDDLLInterface转换为在构造函数中使用IntPtr的类。在构造函数中，调用hidConnect。IDisposable。 VB IDE提供了一个不错的默认实现。因为您正在处理非托管资源，所以您可能还应取消注释它添加的终结器。HWND或Hsomething，则应使用IntPtr代替Integer来更紧密地匹配论证的意义。之后，该类看起来像这样：
Public Class HIDController
Implements IDisposable
#Region "Constructor"
Public Sub New(handle As IntPtr)
If Not hidConnect(handle) Then
'consider a custom exception type here. You may also get
'more info about the failure from GetLastError.
Throw New Exception("Connection failed")
End If
_handle = handle
_prevWinProc = DelegateSetWindowLong(handle, GWL_WNDPROC, AddressOf Me.WinProc)
End Sub
#End Region
#Region "IDisposable Support"
Private disposedValue As Boolean
Protected Overridable Sub Dispose(disposing As Boolean)
If Not Me.disposedValue Then
If disposing Then
' TODO: dispose managed state (managed objects).
End If
' TODO: free unmanaged resources (unmanaged objects) and override Finalize() below.
DisconnectFromHID()
End If
Me.disposedValue = True
End Sub
Protected Overrides Sub Finalize()
Dispose(False)
MyBase.Finalize()
End Sub
Public Sub Dispose() Implements IDisposable.Dispose
Dispose(True)
GC.SuppressFinalize(Me)
End Sub
#End Region
Private _handle As IntPtr
Private ReadOnly _prevWinProc As IntPtr
'on one hand, you are not supposed to throw from Dispose/Finalize, but
'on the other hand, I don't know what you would do instead to signal failure.
Private Sub DisconnectFromHID()
'do not disconnect if you did not connect
If _handle = IntPtr.Zero Then Exit Sub
If Not hidDisconnect() Then
'see above about custom exception type
Throw New Exception("Disconnect failed")
End If
SetWindowLong(_handle, GWL_WNDPROC, _prevWinProc)
_handle = IntPtr.Zero
End Sub
Private Function WinProc(ByVal pHWnd As IntPtr, ByVal pMsg As Integer, ByVal wParam As IntPtr, ByVal lParam As IntPtr) As Integer
If pMsg = WM_HID_EVENT Then
Select Case wParam.ToInt32()
Case NOTIFY_PLUGGED
OnPlugged(lParam)
Case NOTIFY_UNPLUGGED
OnUnplugged(lParam)
Case NOTIFY_CHANGED
OnChanged()
Case NOTIFY_READ
OnRead(lParam)
End Select
End If
WinProc = CallWindowProc(FPrevWinProc, pHWnd, pMsg, wParam, lParam)
End Function
#Region "USB events"
Private Sub OnPlugged(lParam As IntPtr)
RaiseEvent Plugged(Me, New ParamEventArgs(lParam))
End Sub
Public Event Plugged As EventHandler(Of ParamEventArgs)
Private Sub OnUnplugged(lParam As IntPtr)
RaiseEvent Unplugged(Me, New ParamEventArgs(lParam))
End Sub
Public Event Unplugged As EventHandler(Of ParamEventArgs)
Private Sub OnChanged()
RaiseEvent Changed(Me, EventArgs.Empty)
End Sub
Public Event Changed As EventHandler
Private Sub OnRead(lParam As IntPtr)
RaiseEvent Read(Me, New ParamEventArgs(lParam))
End Sub
Public Event Read As EventHandler(Of ParamEventArgs)
#End Region
'other constants and declarations I did not copy.
End Class
Public Class ParamEventArgs
Inherits EventArgs
Public Sub New(param As IntPtr)
_param = param
End Sub
Private _param As IntPtr
Public ReadOnly Property Param() As IntPtr
Get
Return _param
End Get
End Property
End Class
从那里，您可以更改表单以在Load / Close事件中创建和配置此类的实例并挂钩处理程序。您必须更改表单方法以匹配事件签名，但这应该是直截了当的。
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
_controller = new HIDController(Me.Handle)
AddHandler _controller.Plugged, AddressOf Me.OnPlugged
'similarly for other events
End Sub
Private Sub Form1_FormClosed(ByVal sender As Object, ByVal e As System.Windows.Forms.FormClosedEventArgs) Handles Me.FormClosed
If _controller IsNot Nothing Then _controller.Dispose()
End Sub
现在这个类应该很容易从C＃dll中使用。只需将HIDController编译成VB.NET中的程序集，然后从C＃项目中引用该dll（并导入任何所需的命名空间）。不要忘记复制本机dll; C＃编译器只会自动复制VB dll。任何可以提供窗口句柄的类现在都可以创建HIDController并处理其事件，而控制器不知道哪个类正在托管它。
PS：我建议在VB中编码时打开Option Strict。此外，您可能希望查看DllImport以将函数从本机库导入到.NET项目中，因为大多数示例都是如此，并且可以更容易地在VB和C＃之间进行复制。
答案 2 :(得分：1)
在VB项目中引用C＃dll（或者只是将dll放入/ bin文件夹中）
如您所知，您需要将表单类中的VB.NET代码调整为C＃。
在回答你的问题时，而不是从VB.NET表格代码隐藏调用：
iConnectToHID(Me)
你会用
iConnectToHID(this);