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pass object as reference

Hiw can i pass a LV object as a reference?
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Message 1 of 7
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What exactly do you mean?

You can create references as seen in the picture...

 



Remember Cunningham's Law
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Message 2 of 7
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Sorry i didn't have a proper question. I have a LV class - Thread. Which has a VI that runs ascyn. LV is baased on data flow, thus most things are pass by values. However i wanted to hold values for the Object created in the VI therefore it has to be pass by reference.

 

Whats the generic lass for LV object?

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Message 3 of 7
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You can use a global variable in that case. Check out the link below.

http://zone.ni.com/reference/en-XX/help/371361G-01/glang/global_variable/

 

Satish

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Message 4 of 7
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Well, global would solve the problem not i won't do it as it defeats the purpose of OO, having data encapsulated. Anyway thanks!
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Message 5 of 7
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You can still create references from objects. I was able to do it, in the usual way ( Right click object -> Create -> Reference).

 

Once you drop the class in block diagram, did you select right - click and  'Change to control' ?

 

Satish

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Message 6 of 7
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Search this site for "Singlton".

 

There are a couple of ways of achieving a Singlton in LV. Early versions used a single element queue to hold the data so that only the thread that has the lock on the queue can access it.

 

An updated version uses a DVR (Data Value Refence) to hold the instance of the class.

 

If you are developing an Active Object there is supposedly ( I have not read it yet) an Actor pattern recently included in LV.

 

I hope that helps,

 

Ben

Retired Senior Automation Systems Architect with Data Science Automation LabVIEW Champion Knight of NI and Prepper LinkedIn Profile YouTube Channel
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Message 7 of 7
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