Network Shared Variables - Programmatically discovering 'live' variables

[MartinMcD]

Hi everyone,

I'm rewriting a data acquisition app of mine at the moment as a way of learning about implementing OO and network shared variables. The shared variables may not be the best way of implementing my solution but it as much a learning exercise.

So, my question was this:

Is there a way that my datalogger class can find out which network shared variables are currently being published from the local machine? When I place a shared variable block on the diagram I then double click to bring up the menu to select the variable that I want to read from - I am looking for a way to do this at run time.

Thanks very much,

Martin

[MartinMcD]

This page is on deploying NSVs from an executable.

http://digital.ni.co...C6?OpenDocument

[viSci]

If you have the DSC toolkit then you can Get Shared Variable List.vi and just give it the process name (either local or remote).

Without DSC you need to do it using variable engine properties:

http://decibel.ni.com/content/docs/DOC-9523

[MartinMcD]

Thank you for the reply. I think the problem may be that I only have LV8.2, I believe shared variable stuff was rewritten in 8.5?

Thanks,

Martin

http://zone.ni.com/reference/en-XX/help/371361F-01/lvconcepts/usingdynvarapi/

[PaulL]

Thank you for the reply. I think the problem may be that I only have LV8.2, I believe shared variable stuff was rewritten in 8.5?

Thanks,

Martin

http://zone.ni.com/r...usingdynvarapi/

Yes, I think it was about then that NI rewrote networked SVs to use TCP instead of UDP, which dramatically improved their reliability. There have been many further improvements since then. The article for which sachsm included a link actually uses an API that NI introduced in LabVIEW 2009.

The networked shared variables aren't perfect now, but they are probably three orders of magnitude better now than they were in 8.2. For anything but the simplest application (and maybe even for that) I think you might save months worth of work by upgrading, if that is any way a possibility. In my mind networked shared variables were almost unusable then, but now we successfully apply them as a major feature in every application.