LabVIEW2010 .NET interop VISA resource name LVReferenceNumber issue.

[LabViewGuyMike]

I have a VI that uses a VISA resource name, and communicates with a hardware device.

I have compiled this VI into an (.NET) interop, so that I can call it in VB.net 2010.

I have included references in VB.NET for VISA and Labview.

I can see the function as i created it in Labview Builder with intellisense.

My problem is that the VISA Resource Name input requires an LVReferenceNumber, and the the LVreferenceNumber constructor only accepts an Integer.

I can create a session using ResourceManager.GetLocalManager().open("aliasName"),

and can get the resourcename by doing a MessageBasedSession.ResourceName,

But I cannot find a way to get the VISA Resource name as an LVReferenceNum

Any help with this would be much appreciated,

Thanks.

[Daniel-H]

Mike,

I'm not sure there is a direct way of getting a VISA resource name as refnum.

As far as the application goes, I'm not sure why you have to pass the VISA Resource Name as a LVReferenceNumber. Is there a reason why you are doing this that I am missing?

Regards,

Daniel

[LabViewGuyMike]

Daniel,

I would like to pass the resource name as a string.  However, when I compile the VI as an interop, the VISA resource name input requires it to be a LVReferenceNumber.

If it accepted a string there wouldn't be a problem.

Thanks,

Mike

[Daniel-H]

Mike,

You won't be able to pass it as a string. There is also not an easy way to convert this to a refnum. 

Check out this dev zone article:

http://zone.ni.com/devzone/cda/tut/p/id/3251

There is a section under Developing Programmed I/O for creating a visa refnum using another vi.

Hopefully this will help.

Daniel