Event Handler with Internal Loops

Hi...
I'm trying to update a basic program to handle control events more efficiently. The program needs to perform the following functions on start button press:
1) Import data file and parse instrument settings from multiple (X) rows
2) Perform loop with case for each row changing input settings, the read test equipment, and store data in new output data file
I've looked at producer/consumer example and the continuous measurement and logging example, but not sure if either (or none) of the following two options is the best way to handle the looping from the file...
A) Use events to trigger looping for all input cases within a consumer (I've had a problem with this due to not being able to terminate the loop within the consumer with an abort button)
B) Make the consumer only a single data acquisition and load loop inputs as queues and generate output queues to be handled by another parallel logging loop
Any advice?

Hi bripple,
Based on what you've described above, a Producer/Consumer Design Pattern (Events) might work. There is a template for this design pattern that ships with LabVIEW which you can access by going to File > New > VI > From Template > Frameworks > Design Patterns. When the user clicks the start button on your front panel, you can queue up a command that will trigger your consumer loop to read the file and loop over each instrument setting. Within that loop, you should be able to queue up additional events corresponding to each instrument setting and reading.
In terms of error handling, you can conditionally stop a loop if you detect an error. If your user decides to push a button on the front panel to stop the entire process, you can use Enqueue Element at Opposite End to put a stop command at the beginning of the queue. When your consumer loop encounters this event, it can flush the queue and do any cleanup it needs to perform.
One additional thing to be cautious of is that queues can only handle one data type. Because of that, you may also want to consider a Queued Message Handler design pattern. This design pattern allows you to send both a command and data along with that command. I think that would be ideally situated for you since you could send a "Read Instrument" command along with the data for its settings. You can access this design pattern from within LabVIEW as well. If you have LabVIEW 2012 or LabVIEW 2013, see these instructions. The things I've said above also hold true for the Queued Message Handler as well.
Let me know if you have any questions or if this is helpful.
Regards,
Matthew B.
Applications Engineer
National Instruments

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Thanks Charlie
Liao
and congrats to all :-)
* Charlie,
is there a new "Auto Spam Filter"?
[Personal Site] [Blog] [Facebook]

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