how to combine 2 strings into 1

[jcraffael]

Hello all,

Here I have a question about data processing. Now with a UDP open and UDP read vi I keep

receiving UDP messages with different titles (for example $1, $2, $3....) from 2 devices. The 2

devices are almost syncronized and send UDP messages at almost the same time (less than

one second of difference in time). With a Obtain notifier vi I can receive these messages one by

one and send them to another loop. Now what I want to do is to receive these messages TWO

BY TWO! Becasuse they are from 2 devices, firstly two $1 messages, then two $2 messages

and so on. I'd like that the obtain notifier could receive messages two by two, namely the messages

with the same title could be received together! I can't use a concatenate string because the received

messages will accumulate. So what should I do, any idea?

Chao

[jcraffael]

Actually I don't need to combine all messages with all titles two by two, only the message with title $1

because that's the only type of message I'm interested.

[billko]

If you use a common queue instead, both devices can feed the same queue, and then can be dequeued in your other loop.

[RavensFan]

Sure you can use concatenate string.  I assume when you say "messages can accumulate", you are talking about storing the string in a shift register.  You can also use a select statement to determine when to store the string in a shift register or store an empty string in the shift register.

It is difficult to give any advice without seeing the code that you have now.

[billko]

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@RavensFan wrote:

Sure you can use concatenate string.  I assume when you say "messages can accumulate", you are talking about storing the string in a shift register.  You can also use a select statement to determine when to store the string in a shift register or store an empty string in the shift register.

It is difficult to give any advice without seeing the code that you have now.

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Hmmm... your solution is so different than mine.  Maybe I misunderstood the question?

[crossrulz]

I agree that you probably really want to use a queue.  This way you know you are not overwritting messages.  But we really need to see some code to understand properly what you have.

[jcraffael]

Thanks for the reply!

here is a simplied vi of my code. I tried to put a concatenate string at the place

where I put 'here' to do the combination but nothing changed. The Num of message

shows still 2 messages instead of one when 2 messages with title '$ES' come together.

So do you have further suggestion?

[jcraffael]

Sorry my post above with my code is for you. But anyway that's my code and what

I want to say as comments. So any suggestion?

[jcraffael]

Thanks for the suggestion. But as far as I know, the queue function works similar to notifier, right?

And in my code above, do you have any idea how could I use queue and dequeue? Shall they have

the same scheme as the notifier has?

[apok]

first of all ...i would get rid of that "stop/abort" vi? and use a local stop control for the second loop and change the control mechanical action to "switch when pressed"