Make a callback function of variant type

[Taeho]

Hi!
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.

[rolfk]

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@Taeho wrote:
Hi!
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.

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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.

[Taeho]

Thank you for your helping.

Yes, you are right. Then I have got another problem.
When I make a DLL with C++ or VB, How to interface this DLL to variant type input node.
The problem is it must be a variant type input node.