Event Structure with Event source: This VI and Event: Mouse Up

I downloaded an old example from 2008 on this forum and would like to duplicate it. It uses an event structure with an event case of just Mouse Up. Under Event Specifiers: the Event Source is <This VI> and Event: Mouse Up. This works like I want in LV 2009.
In LV 2009 if I choose for Event Source <This VI> under Events Mouse Up is not an option! I tried Event Source: Pane, and then Event Mouse Up is an option, but this does not trigger the event if you drag the mouse off the pane before you lift the mouse button.
I can copy the Event Structure over to my VI and rewire every case but that does not seem to be a good solution cuz I want this in several VIs.
I have attached the original VI with the Event Specifier I want. How do I get this Event Specifier in LV 2009?
Attachments:
Slider event control.vi ‏19 KB

phillman wrote:
I downloaded an old example from 2008 on this forum and would like to duplicate it. It uses an event structure with an event case of just Mouse Up. Under Event Specifiers: the Event Source is <This VI> and Event: Mouse Up. This works like I want in LV 2009.
In LV 2009 if I choose for Event Source <This VI> under Events Mouse Up is not an option! I tried Event Source: Pane, and then Event Mouse Up is an option, but this does not trigger the event if you drag the mouse off the pane before you lift the mouse button.
So what you can do is monitor the 'Mouse Leave' event for th pane, and then start polling the mouse state.
Technically it is correct that there is no Mouse Up event detected since the Mouse Up is not happening on th epane.
Ton
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Can I have multiple event structures with the same event cases?

Hello,
I'm doing an application that reproduces the front panel of the HP6675A power supply. To achieve this, I have done a state machine with different states
(initialize, measures, voltage, current, ocp, ov, store, recall, etc). In each state, should have an event structure that catches the events of the buttons, like for example: if the current state is the Voltage mode and the user press the current button the next state will be the Current mode. For this in each state of the state machine should be the same event structure with the same events.
My problem is that the Vi doesn't work properly when I have multiple event structures with the same event cases. There are some possibily to do this, and how? Or is impossible to have multiple events? I have been reading some posts, but I don't find solutions.
Any help is appreciated.
Thank you very much.
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natasftw wrote:
Or as others mentioned, make two parallel loops. In one loop, have your state machine. In the other, have just the Event Handler. Pass the events from the handler to the state machine by way of queues.
A proper state machine will not need the second loop. The "Wait For Event" or "Idle" state (whatever you want to call it) is all you really need in order to catch the user button presses. The setup is almost there. Maybe add a shift register to keep track of which state to go to in the case of a timeout on the Event Structure.
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Is it better to have one Event Structure with more (10 or 15) cases or several with fewer?

I have several buttons and events on the GUI of my app to monitor. Would it be better to use one Event Structure with several cases (10 or 15) or have a couple and split the cases evenly? None of the cases have much processing to handle, so there is not a time lag issue. I am just worried about overloading the structure. One of the tech support guys mentioned that the event structures are not that hard to get confused.
Has anyone had any problems with Event Structures?

I use event structures very often in my code. I use them just to handle the interface and to run small code. I have had event structures that handled over 50 user interface events and never had a problem. In my personal opinion If there was any code to run I would let the event structure handle the the user interface event that fired a que in another while loop that handled the code.You can find examples on this, if not I will send you one. It is just good programming practice for beginners because it will alow you to build more robust VI's in the future.
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How to use a event structure with a state machine

First, I would like to inform you that I only work on LabView part time, and have much to learn. Anything I do learn, I usually forget until I need it again, because I only work on it part time.
Using your StopWhileLoopMOD[1].vi, I am trying to put a state machine inside the event structure.
Related link: http://forums.ni.com/t5/LabVIEW/How-to-stop-while-loop-in-Event-case/td-p/465564/page/2
Here is my application: on the front panel, the user can select any combination of 7 different tests. I have created cases to perform each step of each test in the correct order, but if the user presses stop, the tests won't stop because some of the cases have a while loop inside the event structure (like you mentioned is a bad idea). The user should be able to stop the test, reselect tests to perform, and re-start the tests.
When the start button is pressed for the event structure, I need all the cases to run in the proper order, unless stop is pressed.
In the past I have indexed an array and used that to run the state machine, but it won't stop immediately.
I have sub VIs that are built in while loops because the outputs of the product needs time to stabilize.  The state machine stops and waits up to a certain number of iterations. If it passes the test, the while loop stops and the next state starts. If it takes too long, it exits and reports an error. Maybe I need to just use the state machine and not an event structure?
Is there a good example of an event structure?
metzler CLAD
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I'm not sure exactly what you are asking, but it sounds like you want to script a bunch of tests and if the user says stop, to immediately stop the current test and abandon the others? I'm going to assume that you know how to clear the array so that it will abandon the others, so I'm guessing that you are having trouble abandoning the current test? If this is indeed the case, then the problem is that you are not able to propagate the message from the main VI FP which is the GUI to the sub vi which is the test, where the test may or may not have a GUI (FP visible) of it's own. Threading was the first thing to come to mind, but this may not be necessary using events.
You can do this by passing a refnum of the stop button to the subVI, where you can then add that wait to the event case structure.
I've attached 2 VIs, mainvi.vi which is just a loop displays the count*2 (number of seconds passed since running) that will call subvi.vi and then check to see if the stop button is pressed. mainvi.vi is by no means a state engine, it is just a simple loop for demonstration purposes. subvi.vi just waits 2 seconds and leaves, it is a better structured state engine with an init state to start a poll case to wait for events and an exit state to clean up. You can modify this any way you wish to get it to do what you want. You will note that even if subvi.vi is being executed, it will terminate immediately when the stop button is pressed.
Hope this helps.
A
Attachments:
mainvi.vi ‏17 KB
subvi.vi ‏33 KB

Using Event Structures with Array of Clusters

Using LabVIEW 8.5
Hi all,
I'm trying to convert an existing application to one that can be used
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Message Edited by bhatiak on 08-04-2008 03:55 PM
Attachments:
Array of Clusters4.llb ‏274 KB

My old tic tac toe example shows how to determine which square of a 2D array has been clicked.
http://forums.ni.com/ni/board/message?board.id=170&view=by_date_ascending&message.id=247044#M247044
You probably can adapt some of it for the arrays on the right. If the array can be scrolled, you also need to account for the "indexvals" offset.
The Layers controls is easiest, because you only show one element. Just read the "index vals" property to get the array element and parse the coordinates to get the cluster element.
btw: the small while loop on the right serves no purpose at all and acts just as a CPU burner. You can delete it without any change in functionality. Is there anything else to it?
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How to stop While Loop in Event Structure with same button?

Hello,
I have a problem. I want to use one control to activate an event in a event structure, and the same control to terminate a while loop in that event.
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Thank you
Message Edited by Heinen on 02-19-2009 06:16 AM
Message Edited by Heinen on 02-19-2009 06:20 AM
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Hello,
I have a bit different problem.
I have a tab control, with several buttons on different pages.
In the current situation, we can talk about two pages, where one page ("Settings") in the Image, has a START and EXIT button, while second page ("Wait") has an EXIT button.
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The control works like this:
When I click on Start in the Settings page, the front panel shows Wait page and attempts to connect to a datasocket server on the remote computer. If the user wants to stop this process, he can click on Exit on Wait page too. But, this doesn't give any immediate effect. On the even of Start button, the front panel is not locked, so the user can actually click the Exit button on the next page when it's visible. But it's of no immediate effect. Means, what the LabVIEW does is, finishes the execution of event in Start button's click, and while this executes, it doesn't consider the Exit button's refreshed value (shown in Red circle in the block diagram).
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Thanks ahead.
Vaibhav
Attachments:
terminate event_diagram.jpg ‏200 KB
terminate event_front_1.jpg ‏63 KB
terminate event_front_2.jpg ‏63 KB

Can I use Ctlref in a event structure with a mouse up event?

I have a large number of controls on a front pannel. I'm using a event structure that triggers the motion of a given motor when the corresponding control is pressed. However, I would like to avoid creating N mostly identical events, so I was planning on using a mouse down event on the front pannel, then retrieve the control reference using the Ctlref node (with gives "Reference to the control on which the event occurred" according to labview manual) and scan a array of references to find out which motor is supposed to move. However, it seems that this node does not appear (contrary to what the manual says).
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Go to Solution.

Bad luck for you. Mouse down on panel does not have the control refnum as it is not operating on a control. Mouse down on a control does have it and since you can configure mouse down events on several controls in the same event case, it provides also a control refnum so that you can still operate on the control in question.
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a division of Test & Measurement Solutions

Event structure with sub-VI

hi,
I designed a event-driven state machine UI that uses pop-up sub-VI for user date configuration and COM port config. Calling the sub-VIs works fine, but by closing them and sending back the modified data to the main state machine, the event handling routine stalls. With highlighting, I could verify that after returning from the sub-VI, the timeout event is being carried out as the only one (used because there is some background code to be processed repeatedly).
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Henry M

Henry,
Please post this question on the weblogic.developer.interest.integration
newsgroup.
Regards,
Raj Alagumalai
Backline Workshop Support
"Henry Mugasha" <[email protected]> wrote in message
news:[email protected]..
Hi,
I am using a Task Control Factory to create Task Control Instances in aloop
and then
create tasks and assign them to a predefined group. I have an event choice
for two events
waiting for the onTaskCompleted and onTaskAborted event call backs.
I have two such operations (of task creation) in the same loop. For
simplicity I have used two separate task factory controls for each of the
tasks (because I even had worse problems using a single control factoryfor
both tasks in the same loop).
When I instantiate the process, through work list I am able to claim,start
and complete the first task. When I try the same procedure (claim, startand
complete) on the second task, the the event choice for the corresponding
task receives 2 event call backs. First it receives the onTaskCompleted as
expected, but then it also received another call back of the same typewhich
displays the error on the server log as:
<Sep 24, 2003 9:43:56 AM EDT> <Warning> <WLW> <000000> <on process
completion, 1 undelivered messages to
'sampleRequestTaskFactoryCtrl_onTaskCompleted'>
<Sep 24, 2003 9:43:56 AM EDT> <Warning> <WLW> <000000> <ejbLoad:
Conversation 1064411008439:null not found>
<Sep 24, 2003 9:43:56 AM EDT> <Warning> <WLW> <000000> <A message wasunable
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onAsyncFailure event>
<Sep 24, 2003 9:43:56 AM EDT> <Warning> <WLW> <000000> <ejbLoad:
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Thanks in advance.
Henry M

Come usare Event structure avendo come source event un indicator

Devo creare un Event, e per controllarlo devo usare una variabile globale. Avete qualche soluzione?
Grazie

Carlo,
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LabVIEW 7.1: menu driven event structure question: How can I cause an event case to fire when either a boolean object or a menu item is selected without polling?

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Hello:
I visited the forum for the purpose of getting some ideas on user
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Bernardino Jerez Buenaobra
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Telephone:+632772-4941-43
Fax/Data: +632772-4944
URL: http://www.imiphil.com/our_location.html
email: [email protected]

Event Structure Freezes Vi After Capturing The First Event

My Event structure catches the first instance of my button press but then it freezes my Vi. The reason is because of the while loop but I need the while loop to constantly read from a serial port and send data to a serial port. The vi included is stripped down to be just a while loop that does nothing. I have also tryed putting the event structure in the while loop, but the same thing is happening.
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Also, put the button inside the event structure where it is acted upon, from LV help (suggest you read the entire events section of help):
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~~~~~~~~~~~~~~~~~~~~~~~~~~
"It’s the questions that drive us.”
~~~~~~~~~~~~~~~~~~~~~~~~~~

Dynamic query structures with restrictions - is this possible

Hi experts,
We have a client that has hard coded query structures, much to our chagrin. These structures change quarterly and because the structures are used across several queries and workbooks, I need to find a new solution that will makes the dynamic and can be updated in production. We have investigated the use of hierarchies for this, and unfortunately this will not work.
Also, their queries are locked down in production, so all changes must transport from Dev to QA to Production. This setting is mandated from the parent company, so changing this is not possible.
Question: Is it possible to write a WebDynpro or ABAP program that will allow users to change these hard coded structures? What tables would be used for this? I'm hoping we can create custom tables that dynamically populate the structures of the query, but I have doubts this can be done.
I suspect this is a stretch, but I'm hoping somebody might have attempted this.
Any ideas would be appreciated. We're proficient in BI so any suggestions would be great.
Example structure:
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...to put a maintainable table in front of the users can be as easy as creating a 'parameters' cube and putting an input ready query on it. Lots of other options, such as a simple custom table and a gui based form to maintain, but I've used exit variables looking up values from custom parameter cubes a great deal in planning applications.
Another alternative may be to add a new attribute to your gl accounts to indicate the nominal reporting group, and base your variable exits or row structures on that, leaving your users simply to mainain their GL Account Mastre data as required.
Edited by: Andrew Trousdell on Jun 18, 2010 4:07 AM

Event Structure with Event source: This VI and Event: Mouse Up

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