Private Declare Function JMail_DllGetClassObject Lib "JMail.dll" Alias "DllGetClassObject" (rclsid As UUID, riid As UUID, ByRef ppv As Any) As Long

Function CreateJMailMessage() As Object
    '这里需要引用Win.tlb类型库
   
    Dim IID_IClassFactory As UUID
    Dim IID_IUnknow As UUID
    Dim CLSID_Message As UUID
   
    Const CLSIDSTR_Message As String = "{E5FF9F62-0E7C-4372-8AD5-DA7D2418070C}"
   
    CLSIDFromString CLSIDSTR_Message, CLSID_Message
    CLSIDFromString IIDSTR_IUnknown, IID_IUnknow
    CLSIDFromString IIDSTR_IClassFactory, IID_IClassFactory
   
    Dim ClassFactory As IVBClassFactory
   
    Dim lRet As Long
   
    lRet = JMail_DllGetClassObject(CLSID_Message, IID_IClassFactory, ClassFactory)
   
    Dim MyObject As IUnknown
   
    ClassFactory.CreateInstance Nothing, IID_IUnknow, MyObject
   
    Set ClassFactory = Nothing
   
    Set CreateJMailMessage = MyObject

End Function

Private Sub Command1_Click()
    Dim JMailMessage As Object
   
    Set JMailMessage = CreateJMailMessage
   
    MsgBox JMailMessage.About
End Sub