Compile error during workbook open

Question

I have a workbook which uses a certain type, let\'s call it T, that\'s in a module (DLL) defined in my References -- all good.

I created some code that\'s called in

Answer 1

Like other people have said, if you are not going to add the reference to the DLL until Workbook_Open, you have to use late binding to connect to the stuff in the DLL.

However, I think you are going about this the wrong way. Instead of adding a reference to the DLL in Workbook_Open, have it already referenced and check .IsBroken instead. Then you can have code to do what ever is needed to fix the broken reference.

This keeps the benefit of early binding and you won't get the same kind of compile errors if the reference to the DLL is broken.

NOTE: You can still get compile errors, but they won't be for the missing DLL. While you have a broken reference, any use of functions from the VBA Strings module will trigger a compile error if the function isn't prefaced with Strings. For example, the following code will cause a compiler error before Workbook_Open runs if you have any broken references.

Private Sub Workbook_Open()
   Dim r As Reference
   For Each r In ThisWorkbook.VBProject.References
      If r.IsBroken Then
         MsgBox "Found broken reference." & vbCrLf _
              & Mid(r.FullPath, InStrRev(r.FullPath, "\") + 1)
      End If
   Next r
End Sub

To fix, prefix Mid and InStrRev with Strings..

MsgBox "Found broken reference." & vbCrLf _
     & Strings.Mid(r.FullPath, Strings.InStrRev(r.FullPath, "\") + 1)