将Excel VBA转换为VB（DCOM）

Question

我继承了一个Excel VBA电子表格。现在我被要求将其转换为VB。

我认为该应用程序使用DCOM对象从PLC获取数据。当MX1.0更新时，以下代码运行子过程SBR1Select。

Sub Workbook_Open()
    ActiveWorkbook.SetLinkOnData "dassidirect|strandburner!MX1.0", "SBR1Select"
End Sub

当我打开控制面板 -> 管理工具 -> 组件服务，然后导航到控制台根节点 -> 组件服务 -> 计算机 -> 我的电脑 -> DCOM配置，会列出"DASSIDirect"项目，我相信这是Excel引用的内容。

如何通过DASSIDIRECT组件将VB代码连接到PLC？

注意：DASSIDIRECT也是一个Windows服务（不确定是否有助于回答问题）。

- Steven

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这些回答解决了你的问题吗？否则，你能否编辑并更新你的问题？ - Christian Payne

Answer 1

我以前做过一些与PLC相关的工作，问了我的一位老同事。他说你需要WonderWare的InTouch，它有一组与DASSIDIRECT兼容的.NET 2程序集，可以为你提供所需的内容。

这里是最新版本，希望这正是你要找的。

- miPwn

Answer 2

哇，DDE。我相信你已经知道，DDE相当古老了。网络DDE已经被弃用，在Vista中将不再起作用。我只能想象这种趋势可能会继续下去。然而，user32中的DDE API仍然有效（参考文献在此：http://msdn.microsoft.com/en-us/library/ms674605(VS.85).aspx），你可以通过一些工作从.NET应用程序中调用它。我能找到的唯一示例是针对VB6的，而且那时候它们已经很旧了。我相信你可以想象这有点痛苦。无论如何，我从API-Guide（来自Mentalis）中挖出了这个示例。虽然不是.NET，但它应该能让你开始：

'This application shows you how to use DDE to create a better PrevInstance-function.
'Compile this sample and start it two times
'The first instance minimizes itself and when the second instance is started, it will
'send a message to the first instance to maximize itself.

'in a module
Public Const VBServerName = "TestServer"
Public Const VBTopicName = "SHOW_YOUR_MAIN_WINDOW"
Public Const XCLASS_BOOL = &H1000
Public Const XTYPF_NOBLOCK = &H2 ' CBR_BLOCK will not work
Public Const XTYP_CONNECT = &H60 Or XCLASS_BOOL Or XTYPF_NOBLOCK
Public Const CP_WINANSI = 1004 ' default codepage for windows & old DDE convs.
Public Const SW_RESTORE = 9
Public Const DDE_FACK = &H8000
Public Const XCLASS_FLAGS = &H4000
Public Const XTYP_EXECUTE = &H50 Or XCLASS_FLAGS
Public Const DNS_REGISTER = &H1
Public Const DNS_UNREGISTER = &H2
Public Declare Function DdeInitialize Lib "user32" Alias "DdeInitializeA" (pidInst As Long, ByVal pfnCallback As Long, ByVal afCmd As Long, ByVal ulRes As Long) As Integer
Public Declare Function DdeCreateStringHandle Lib "user32" Alias "DdeCreateStringHandleA" (ByVal idInst As Long, ByVal psz As String, ByVal iCodePage As Long) As Long
Public Declare Function DdeConnect Lib "user32" (ByVal idInst As Long, ByVal hszService As Long, ByVal hszTopic As Long, pCC As Any) As Long
Public Declare Function DdeNameService Lib "user32" (ByVal idInst As Long, ByVal hsz1 As Long, ByVal hsz2 As Long, ByVal afCmd As Long) As Long
Public Declare Function DdeFreeStringHandle Lib "user32" (ByVal idInst As Long, ByVal hsz As Long) As Long
Public Declare Function DdeQueryString Lib "user32" Alias "DdeQueryStringA" (ByVal idInst As Long, ByVal hsz As Long, ByVal psz As String, ByVal cchMax As Long, ByVal iCodePage As Long) As Long
Public Declare Function DdeUninitialize Lib "user32" (ByVal idInst As Long) As Long
Function DdeCllback(ByVal uType As Long, ByVal uFmt As Long, ByVal hConv As Long, ByVal hszTopic As Long, ByVal hszItem As Long, ByVal hData As Long, ByVal dwData1 As Long, ByVal dwData2 As Long) As Long
    DdeCllback = Form1.AppDdeCallback(uType, uFmt, hConv, hszTopic, hszItem, hData, dwData1, dwData2)
End Function
'in a form
Dim isRun As Boolean, idInst As Long, hszVBServer As Long, hszVBTopic As Long
Dim hconvVBServer As Long, dderesult As Long
Private Sub Form_Load()
   'KPD-Team 2000
   'URL: http://www.allapi.net/
   'E-Mail: [e-mail]
   If DdeInitialize(idInst, AddressOf DdeCllback, 0, 0) Then Exit Sub
   hszVBServer = DdeCreateStringHandle(idInst, VBServerName, CP_WINANSI)
    hszVBTopic = DdeCreateStringHandle(idInst, VBTopicName, CP_WINANSI)
    'try to find the first instance
    hconvVBServer = DdeConnect(idInst, hszVBServer, hszVBTopic, ByVal 0&)
    If hconvVBServer Then
        Unload Me
        Exit Sub
    End If
    DdeNameService idInst, hszVBServer, 0, DNS_REGISTER
    Me.WindowState = vbMinimized
End Sub
Private Sub Form_Unload(Cancel As Integer)
        DdeFreeStringHandle idInst, hszVBServer
        DdeFreeStringHandle idInst, hszVBTopic
        'only unregister the DDE server for first instance
        If isRun Then
            If DdeNameService(idInst, hszVBServer, 0, DNS_UNREGISTER) Then
                MsgBox "in ServiceUnRegister", vbOKOnly, "Error"
            End If
        End If
        DdeUninitialize idInst
End Sub
Function AppDdeCallback(ByVal wType As Long, ByVal wFmt As Long, ByVal hConv As Long, ByVal hszTopic As Long, ByVal hszItem As Long, ByVal hData As Long, ByVal lData1 As Long, ByVal lData2 As Long) As Long
        Dim iCount As Long, Buffers As String, Ret As Long
        Select Case wType
            Case XTYP_CONNECT
                iCount = DdeQueryString(idInst, hszTopic, vbNullString, 0, CP_WINANSI)
                Buffers = Space(iCount)
                DdeQueryString idInst, hszTopic, Buffers, iCount + 1, CP_WINANSI
                If Buffers = VBTopicName Then
                    Me.WindowState = vbNormal
                    'add any code for the first instance have found the second one is launch
                    Ret = DDE_FACK
                End If
                AppDdeCallback = Ret
            Case XTYP_EXECUTE
                AppDdeCallback = Ret
        End Select
End Function

- Oorang

Answer 3

处理这个问题最简单的方法是使用VB 6，并创建一个“ActiveX EXE”，该EXE与SIDirect进行DDE通信。从VB 6执行DDE很容易。然后使用tlbimp公开为VB 6模块创建主互操作程序集，或者仅从C＃代码中将EXE作为COM组件引用。

- zumalifeguard