如何使用C#为VB.Net编写的dll [英] How to use a dll written for VB.Net in C#

问题描述

我有个问题要问.

我有一个dll文件，用于在USB上读写数据.要在VB.Net中使用dll，需要集成一个.vb文件，该文件与该dll文件以使用其功能，属性等.

I have a dll file written for reading&writing data on USB. To use dll in VB.Net, one needs to integrate a .vb file which interface to that dll file to use its functions, properties etc..

我需要在C#项目中使用此dll.这可能吗?如果是的话，我该如何实现?

What I need is to use this dll in a C# project. is this possible? if it's, how can I achieve it?

类形式的代码:

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

如何使用我的表单实例发送到HIDDLLInterface(等同于我的关键字)?

接口类代码如下:

进口系统导入System.Threading导入System.Runtime.InteropServices

Imports System Imports 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

推荐答案

假定VB.NET代码为

Assuming the VB.NET code is CLS compliant, you can simply add a reference to it to your C# project.

此时，DLL中的名称空间和所有公共成员将对您的C#代码可用.

At this point, the namespace and all public members in the DLL will be available to your C# code.

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