Maximum size of an event structure

I have just a short question about the maximum size of a event structure, and did not found it yet in the forum.
I have an event case with 35 event cases. How many are allowed, what is recommended and is there a huge loss of performance by seizing it up?
Thx for answer

As far as run-time performance is concerned, the number of event cases in an event structure should have no noticeable effect. Worst-case scenario, when the event structure is woken up due to an event occuring in the system, it does a linear search through the list of event cases to figure out which event-handling diagram matches the event that it pulled off the queue. These tests are pretty quick (3-4 comparisons per event-handling diagram) so I can't imagine it really would have any effect on performance. However, this does tell you that if you want to squeeze every ounce of performance out of your event-handling code, make sure the most frequently run event-handling diagram is the first one in the list.
The only performance issue I could see arising is what Damien mentioned - at edit time, it may take longer to make edits to the event structure (eg adding new event cases, changing the events a given diagram is associated with). I don't know that I've seen any issues because of this (the largest application I've written has an event structure 40 different event-handling cases), but I think this is where any potential performance issues reside.
Hope this helps.
J
Jason King
LabVIEW R&D
National Instruments

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Message was edited by:
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Transfering a case structure to event structure

Hi, I am trying to transfer case structures that are currently set up to a control that if on prompt the user where to save and then save all following files to that location till end of program and if off the do nothing. I would like to enable these to be switched on and off at any point and know to use an event structure. The problem is I am new to coding with an event structure and have been able to get the button to work but not continuously save. I attached a screen shot of the original case structure and was wondering if someone could show me how to change it to the event structure format with the same functionality. I'm getting a little lost and confused. Thanks!
Attachments:
alltruecases.jpg ‏534 KB

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1.jpg ‏669 KB
2.jpg ‏317 KB

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Go to Solution.
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bmishoe wrote:
I learned something new today...
One more thing you can learn, When you are passing an array input to a For loop with 'Auto indexing' enabled, you need not wire anything to For loop's 'N' terminal.
In other words:
If you enable auto-indexing on an array wired to a For Loop, LabVIEW sets the count terminal so you do not need to wire the count terminal.
In your code, you can remove the 'Array Size' nodes.
I am not allergic to Kudos, in fact I love Kudos.
Make your LabVIEW experience more CONVENIENT.

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If the user starts to edit the numeric control value i would like to call one subVI, and if the boolean control value is changed, call a different subVI.
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The tricky bit was that i wanted the numeric control values to flag they were going to be edited, so i could call a subVI, before their values were changed by the user. This is done by using the key focus property node, - i need to detect changes on the fly rather than post the event. Probably didn't make this clear enough in my original post.
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Message Edited by BlueTwo on 01-15-2009 06:52 AM
Attachments:
evstrct1.jpg ‏63 KB

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THX Tom

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James.Morris wrote:
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James, I swear I'm not picking on you today
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6.i didn't have a "Value (Signaling)" property- (a subject of some CLAD exam questions not that you suggested it)
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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.

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Shane
*6.14 Debug Component*
This section specifies the format for the Debug Component. The Debug Component contains all the metadata necessary for debugging a package on a suitably instrumented Java Card virtual machine. It is not required for executing Java Card programs in a non-debug environment.
The Debug Component references the Class Component (Section 6.8 "Class Component), Method Component (Section 6.9 "Method Component), and Static Field Component (Section 6.10 "Static Field Component). No components reference the Debug Component.
The Debug Component is represented by the following structure:
{code}
debug_component {
u1 tag
u2 size
u2 string_count
utf8_info strings_table[string_count]
u2 package_name_index
u2 class_count
class_debug_info classes[class_count]
{code}
The items in the debug_component structure are defined as follows:
*tag* tag item has the value COMPONENT_Debug (12).
*size* The number of bytes in the component, excluding the tag and size items. The value of size must be greater than zero.

Event structure compactRIO

Hello
Can I use an event structure on a diagram running on the CompactRIO
controller? I try to use a button in an event structure but the code
inside the event "value changed" never runs.
Thanks

Hello David,
A LabVIEW RT program should be programmed as if the front panel is not
there. In an embedded LabVIEW RT program, when you write to a local
variable it does not update the front panel, since the front panel is
not downloaded with the VI to the target. So it normal that events based on "value changed" doesn't work (Cf. this KnowledgeBase).
Cordially,
.mrLeft{float:left} .mrInfo{border-left:solid 1px #989898;font-size:x-small;color:#989898}
Mathieu R.
  CTD - Certified TestStand Developer / Développeur TestStand Certifié
  CLAD - Certified LabVIEW Associate Developer

Event Structure - Lock Event: Does it Queue ?

I had couple of question related to this post in other posts but I thought I'd use a new one since it might be more relevant (others were related to local variables, and VI file sizes)
I have this event structure running about 10 different tasks. For some I would like to lock the panel when it runs. I used "Lock panel ..." but during the run, if you click on any boolean and menu ... for some reason it queues the task and performs it after the event is complete ... is there any way I can lock the event and not have any event queued ? Thnks !
Kudos always welcome for helpful posts

If you were to change the value of the Block Panel Event boolean using a local variable it wouldn't fire an event so I'm not sure that would be the way to go. I had intended that just to be an example control.
I have further modified the example to show how a custom user event can be programatically fired to signal that the front panel should be "unlocked" and that new events should be added to the event queue. In the new example you will see that while the LED is flashing no events are queued. Once the LED is done flashing it communicates to the event structure via a user event.
It may also be possible to change the value of the "locked?" boolean without requiring an event to do so. I didn't explore this option but it may be a valid approach.
Also please remember that any example I have posted here is not meant to be incorporated into an application - I am merely attempting to demonstrate ideas and concepts. It will be more beneficial for you to examine and understand how I programmed a certain behavior and then use those concepts to create your own application than to try to make my code fit into your application.
Regards,
~ Simon
Attachments:
lock event 2-1.vi ‏75 KB

Maximum size of an event structure

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