PRB: ASP Returns "Error in Loading DLL" with VB Component

ID: Q178777


The information in this article applies to:
  • Microsoft Visual Studio versions 97sp2, 97sp3


SYMPTOMS

When using Visual Studio Service Pack 2 or 3, a problem may occur when you try to work with objects that have been assigned as Visual Basic collections. When you try to access any of the functions of the collection (such as count, add, or remove), or use the For...Each...Next enumerations, the following Visual Basic Script error appears:

Microsoft VBScript runtime error '800a0030' Error in loading DLL


CAUSE

We are researching this bug and will post new information here in the Microsoft Knowledge Base as it becomes available.


RESOLUTION

There are two possible solutions to this problem:

  • Revert back to a previous version of Visual Basic 5.0 (prior to Service Pack 2).

    -or-


  • Implement a class wrapper around the collection object of Visual Basic. To implement a class wrapper around the collection object, follow these steps:

    1. Add the following code to a class module in Visual Basic:
      
            Option Explicit
            Private m_cList As Collection
      
            'Add
            'Purpose     - Add to list
            'Inputs      - (String)  sKey
            '            - (Variant) vItem
            Public Sub Add(ByVal sKey As String, vItem As Variant)
              m_cList.Add vItem, sKey
      
            End Sub
      
            'Remove
            'Purpose     - Remove from list
            'Inputs      - (String)  sKey
            Public Sub Remove(sKey As String)
              m_cList.Remove sKey
            End Sub
      
            Public Property Get Count() As Long
              Count = m_cList.Count
            End Property
      
            Public Property Get Item(sKey As String) As Variant
              On Error Resume Next
              If m_cList.Count > 0 Then
                If IsObject(m_cList(sKey)) Then
                  Set Item = m_cList(sKey)
                Else
                  Item = m_cList(sKey)
                End If
              End If
            End Property
      
            Public Property Get NewEnum() As IUnknown
              On Error Resume Next
              Set NewEnum = m_cList.[_NewEnum]
            End Property
      
            Private Sub Class_Initialize()
              On Error Resume Next
              Set m_cList = New Collection
            End Sub
      
            Private Sub Class_Terminate()
              On Error Resume Next
              Set m_cList = Nothing
            End Sub 


    2. In Visual Basic, under the Tools menu, click Procedure Attributes, click Advanced, and select the Item methods Procedure ID as default and select the NewEnum procedure Id as -4 (you will need to type this in manually).


    3. Place this code into a class module for the project. Instead of using a collection, use the class module with this code.


    4. To test this new object, create a test Active Server Page with the following code:
      
            <%
            'Create an instance of the new collection object.
            Set objMyColl = Server.CreateObject("Project1.Class1")
      
            If IsObject(objMyColl) Then
               Response.Write "Yes, I am an object" & "<BR><BR>"
      
               'Add some test members.
               objMyColl.Add CStr("1"), "Apple"
               objMyColl.Add CStr("2"), "Orange"
               objMyColl.Add CStr("3"), "Banana"
      
               'Get the count of the members.
            Response.Write "I have " & objMyColl.Count & " members" & "<BR><BR>"
      
                Response.Write "The members are: " & "<BR>"
                For Each Item in objMyColl
                  Response.Write item & "<BR>"
                Next
             Else
                Response.Write "Server failed to create object."
             End if
      
            %> 



STATUS

Microsoft is researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.


MORE INFORMATION

Steps to Reproduce Behavior

  1. Create an ActiveX DLL project in Visual Basic 5.0 with Service Pack 2 or later.


  2. Add a class to the project that has a method (function) with a return parameter as a collection.


  3. Compile the project into a DLL.


  4. Create an Active Server Page that creates an instance of the object and accesses any methods of the object or tries to enumerate the collection. The Active Server Page returns the following error:
    Microsoft VBScript runtime error '800a0030' Error in Loading DLL


Additional query words:

Keywords : kbGenInfo kbVS
Version : WINDOWS:97sp2,97sp3
Platform : WINDOWS
Issue type : kbprb


Last Reviewed: April 15, 1999
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