Passing parameters between C# and Labview with ActiveX

[labJunky]

Hello, I've two questions:

I would like to know what sort of variable types can I pass into labview from C# or python, using activeX. 

I guess they would be things like, number types, strings, etc. But what about paths, or error clusters?

Also in labview I normally pass in objects into my subvi's (since I use OOP). How would it be possible to do this from another language? 

Lets say I have a self defined database object that I normally pass around in labview. Can I call some factory method vi from C#, and get the control from the front panel after running the vi. Cast that as a generic object in C#, and then call another vi, and pass in the object? 

Like.

// Get a vi reference, and run my databaseFactory vi.

string databaseFactoryPath = ...;

VirtualInstrument databaseFactoryVi = labVIEWApp.GetVIReference(databaseFactoryPath "", false, 0);

databaseFactoryVi.Run(true);

// Get the database labview object from the frontpanel control called "database out"

object databaseObject = (object)viTest.GetControlValue("database out");

// Obtain a reference to a database method called load.vi

string databaseLoadPath = ...;

VirtualInstrument databaseload = labVIEWApp.GetVIReference(databaseFactoryPath "", false, 0);

string parameterName = "database in";

databaseLoad.Call( parameterName, databaseObject );  

...

Will that work?

Thanks, 

labjunky

[labJunky]

Well my example above doesn't work 😞

I get an exception thrown on the line:

object databaseObject = (object)viTest.GetControlValue("database out");

"The parameter is incorrect. (Exception from HRESULT: 0x80070057 (E_INVALIDARG))"

the databaseObject comes back 'null"

Anyone know how to do this type of thing properly?

thanks,

labJunky