GetClasses - Enumerate all the classes defined in a type library

' Return a collection with all creatable classes of
' the type library specified in TypeLibFile.
'
' Set IncludeNotCreatableClasses = True to include not creatable classes
' (that is, those with Instancing property set to PublicNotCreatable) too.

' Be sure that "TypeLib Information" type library (TlbInf32.tlb)
' is referenced in your VB project.

Function GetClasses(ByVal TypeLibFile As String, _
    Optional ByVal IncludeNotCreatableClasses As Boolean) As Collection
    Dim TLI As New TLIApplication
    Dim TypeLibrary As TypeLibInfo
    Dim Class As CoClassInfo
    
    ' raises an error if unable to open the type library
    ' (e.g. file not found or not a TLB)
    Set TypeLibrary = TLI.TypeLibInfoFromFile(TypeLibFile)
    
    ' prepare the result
    Set GetClasses = New Collection

    ' fill the return collection with class names
    For Each Class In TypeLibrary.CoClasses
        ' exclude not creatable classes if necessary
        If IncludeNotCreatableClasses Or (Class.AttributeMask And _
            TYPEFLAG_FCANCREATE) Then
            ' the class is creatable or we don't care
            ' about the creatable attribute
            GetClasses.Add Class.Name, Class.Name
        End If
    Next
End Function