Can you use Use create user event, generate user event, etc. to pass data from one VI to another VI, kind of like global variable? Is it possible?

[mcduff · Accepted solution]

@GRCK5000 wrote:

Most programmers advise not to pass data between two or more VIs using global variables. I had a post some time ago and I asked if it was possible to pass data between two VIs and @mcDuff said that it was possible and even provided great examples. In these examples, events are being used to pass data between two loops, more like producer-consumer architecture, but not between VIs. 

I have attached a VI called sender and I would like to pass string "hello" to receiver.vi

You could use a named Queue, although caution is needed when using them.

The following example will work, if and only if, your receiver VI is started before the sender.

[alexderjuengere]

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@mcduff wrote:

You could use a named Queue, although caution is needed when using them.

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I use them all the time - did you know, you can spawn up to 1Billion named queues on  2014 intel I7 @ 12 gb ram before running in any problems?!  (labview reports a warning or error too many queues, if I remember correctly)

and you are meant to close them, by "close queue"

probably, no good advice...

[mcduff]

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@alexderjuengere wrote:

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@mcduff wrote:

You could use a named Queue, although caution is needed when using them.

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I use them all the time - did you know, you can spawn up to 1Billion named queues on  2014 intel I7 @ 12 gb ram before running in any problems?!  (labview reports a warning or error too many queues, if I remember correctly)

probably, no good advice...

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Named Queues, Bytes at Port, Global Variables, etc. are like religion and politics on this forum; don't want to get into a flame war, thus a warning. 🙂 

PS I use them too.

[GRCK5000]

Thanks McDuff! I will definitely go with queue, just turn the two codes into subVIs. Boom!