Event structures in older versions of labview?

Question

Can anyone tell me how to create a workaround for a 'value change' event structure in an older version of labview?  I have a student  version of LabVIEW 6i and need to create a queued buffer from each value change.  Thank you.

Answer 1

James.Morris wrote:
Ah, you're only one release away from the event structure. That's too bad.
You're going to have to implement a Polling loop that continuously checks the user inputs. Make sure you add a Wait function to the loop (~100ms) because that will act as your chance for the user to make changes. You can use shift register(s) to keep the previous loop's values and compare to get a bunch of Value Change booleans. If you want a specific case for the specific events, then you can group all of your Value Changes in to an array and act upon the ones that are True via a Case Structure.
The Event Structure only pulls a single event per loop and has a queue of events to handle for following loops. You might encounter multiple value changes in a single loop if the user clicks fast enough, or you trigger value changes. To avoid losing the trailing events, you should probably have a For loop within the Polling loop that handles all True values. Either that, or have a consumer loop that handles all of your events.
James, I swear I'm not picking on you today
You can set the maximum number of events alowed in the event queue per event in the edit event dialog box.  Check box and int fields in the lower right side.
6.i didn't have a "Value (Signaling)" property- (a subject of some CLAD exam questions not that you suggested it)
Student editions could not use 6.i events.  From 7.0 or 7.1 through 2011 Student Edition could use but not edit event structures. 2012 and on Event Structures are available in "All Versions" of LabVIEW- at the time.  I haven't looked into the newer license options.
On to licensing options. (Not a lawyer! consult your Legal Dept!)
If you are not doing work towards earning a educational certificate you should not be using Student Edition.  And, in some cases (Like working on a student project with commercial investment) not even then!
The Home Edition is also a new option.  It is intended to enable fast "Proof of Concept" development or development for your sole non-comercial use.
LabVIEW Full and Professional are for comercial use and have a "Home Use License Agreement" clause attached. If your company owns a LabVIEW License you CAN install a copy on a "Home PC" for the limited use of aiding your employer (who paid for the license) such things would arguably enclude "Training"
NI is not totally opposed to negotiating "Exceptional" agreements for mutually beneficial reasons.  Youl'd better bring a justification better than "I can't afford it"  Go find some investors and buy a license in that case.  And Yes, until the moderators take this down, I did at one time have a LabVIEW license for exclusively engaging the LabVIEW Community (Forums and NI Sponsored events use only- LAVA was not encluded)  I'm not sure if such a deal could be negotiated in the future.  In Fact, The Home Edition would have been less costly.