Event Handler for external DLL events not triggering

[jpswart82]

I'm using Office 2010, and trying to use VBA to access the methods and events of a ActiveX DLL file. The DLL is supplied as part of the SDK of a fingerprint reader from ZKTECO - the reader is connected to the PC via ethernet. My goal is to use the methods and events available in the DLL in order to have a "check in" system where somebody who is registered can come and scan their fngerprint, and then on the excel side their "ID" will link with names from a database. My problem is that I'm struggling to make the event handler get executed when I use the fingerprint reader. I've included the DLL file via Tools -> References, and can view it using the object browser (screenshot below).

object browser.jpg

The following code in Module1 successfully allows me to connect to the reader and use the methods from the DLL. The class is called CZKEM.

Option Explicit


Public Sub connect()
    Dim IPAddress As String
    Dim Ports As Long
    Dim connected As Boolean
    Dim tester As CZKEM
    Dim vbool As Variant
    Dim i As Integer
    Dim success As Boolean
    Dim UserID As Long
    Dim fingerIndex As Long
    Dim machineID As Long
    Dim eventMask As Long
    
    Dim iclass As New zkemkeeper.CZKEM
    
    IPAddress = "192.168.1.201"
    Ports = 4370
    Set tester = New CZKEM
    
    machineID = tester.MachineNumber
    
    UserID = 10
    fingerIndex = 0
    eventMask = 65535


    connected = tester.Connect_NET(IPAddress, Ports)
    vbool = tester.RegEvent(machineID, eventMask)
        
End Sub

I've also managed to get access to the events seen in the object browser using the following code in Class1 Module:

Public WithEvents mApp As zkemkeeper.CZKEM




Public Sub mApp_OnFinger()
    Worksheets(1).Range("A1") = "HETHOM"
End Sub


Public Sub mApp_OnKeyPress(ByVal Key As Long)
    Worksheets(1).Range("A1") = "HETHOM"
End Sub


Public Sub mApp_onVerify(ByVal UserID As Long)
    Worksheets(1).Range("A1") = "HETHOM"
End Sub

However, even though I connect to the reader successfully and run the RegEvent method, which according to the SDK documentation enables real-time events to be triggered, the event handlers never execute. I'm not sure if it is enough that I do the event handler in the Class1 module - I've tried creating an object of Class1, and I can call the event handlers manually, but they don't seem to be triggered when I use the fingerprint reader.

I'm sure there are probably many places where things can go wrong - but I guess my question is mainly if event handlers can be triggered in a class module or if I still have to do something with Class1 in the Module1 code.