Question about using referencing

[ankit]

Greetings All

I am working on someone else's code and came across this part in the VI where the indicators (as shown in red box) are getting updated somehow by referencing. The problem is when I make a property node of any one of the indicators shown in the redbox and try to read the current value it only reads it once when the program starts . Both the indicator and its property node are placed inside the same while loop.

For sure I know that these indicators are getting updated because I can see my graphs going up and down but when I add a property node for one the same graphs and select cursor position and try and get value from it, it only shows the one value where cursor was placed when the VI was started and then never gets updated on moving the cursor.

I think I am missing something over here.

Any ideas.....?????

Ankit

Message Edited by ankit on 06-27-2008 03:43 PM

[Ray.R]

From the portion of the code you are showing, it appears they update the values by using references. 

Right click the control(s). At the top you'll have a selection called Find >   Then you'll see all property nodes or locals that either read or right to that control.  You have to be careful that no race conditions are created by that type of programming.   Whoever wrote the code tried to implement it as a text-based language and to create variables and pass by reference...  Unfortunately, that is not how Labview works.  It follows a dataflow, and the wire is the variable.

RayR

[parthabe]

Hi Ankit,

It is very difficult to tell what is going wrong in your VI from the screenshot.

Can you post the VI here?

[ankit]

Hey Partha

I am sorry but I will not be able to post the VI as it can get me in trouble.

Thanks & Sorry......

Thanks RayR: I will try what you said......

Ankit

[Ray.R]

Now that's geting a bit annoying.. Spammers hijacking threads.. 😠

[parthabe]

I think the moderators were on leave over the weekend.

[Ray.R]

You also noticed all the spam... 😉

[Ray.R]

For those reading this and not knowing what we were talking about, there was a spam message within this thread.  It was removed. 😉

[smercurio_fc]

But the 1-star rating on the thread is still there. Looks like that bug is still there, but given the ratings system change that is coming (hopefully soon), it doesn't really much matter. So I ask myself: "Why do I bother mentioning it?". Beats me.

[Ray.R]

The 1 star rating appears on the spam message.  That seems to indicate that it is not deleted, but rather hidden.. 😉

You get the 5 stars to offset the overall rating of this thread 🙂