I use an Invoke node using Active X.
This invoke node get a Progress argument which Object that implements IMPTProgressCallback interface.
It should have implementation of methods Onstart, OnProgress and OnEnd.
The problem is I have no idea how to implement the this type of Callback function in Laview.
Please check my attachement file and help me.
I'm not very familiar with ActiveX callbacks but AFAIK you can not implement ActiveX (or .Net) objects that implement a specific class interface in LabVIEW. You would have to implement that class in C++ or VB and then pass this object to the callback installation function which uses some other means to communicate to your LabVIEW callback.