I have a type library that I created in C++. In this, I can create ATL object and create interfaces from templates that I have already written. In C++, its quite easy but I cant seem to figure out how to do this in LabVIEW. If anybody can help me, this would be great.
When you create a VI, you can do a save as and select .vit as the extension. The .vit extension stands for VI template. You can also save controls as templates by using the .ctt extension. When you select "New" from the file menu, you'll have an option to select VI from Template.
I'm sorry, my question was a bit to vague. My template is in an actual Type Library file (tlb) that I wrote in C++. I can access methods and properties with an automation reference, but I can't seem to find how to access an interface. In C++, you add a ATL object (Active Template Library... I think), and then you can access different interfaces. Here's a link on how to do this in C++:
The node you're looking for is "Variant to Data". Just wire in the ActiveX refnum into the input (it will auto-adapt, no need to make it a variant) and use an ActiveX refnum constant to specify the "type" you want to convert to. It then issues the QueryInterface internally to return that interface.
I'm afraid I don't understand your question. If you have a LV refnum to an interface on your class (IFoo), then to get a different interface (IBar), just call the Variant to Data. All three terminals are going to be refnums. IFoo refnum going in, IBar refnum constant going in the top and the IBar refnum instance coming out.
However, looking over your post again, I just want to make sure...this is how you access the various interfaces ALREADY implemented by the COM/ActiveX object. You can't implement the interface inside LV...
but I was looking for a way to implement the interface. Too bad its not possible in LabVIEW, I think its the first time I run into that kind of problem.
