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).
I have found other ways to do what I need (I was thinking of using an array containing the coordinates of my controls and the coords node of the event structure), but I wanted to know why I can not find that node (which appears for "value change" event for instance). I'm using Labview 2013.
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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.
This is probably also the issue Jeff might have seen. When configuring multiple events for the same frame LabVIEW will only show the event terminal that are present in all of those events. Terminals that don't exist in at least one specific event of the multiple events for that frame are not selectable anymore.
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions

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How can i use the same front panel graph in more than one events in an event structure?

i want to display the signals from my sensorDAQ in a graph.but i have more than one event in the event structure to acquire the signal and display it in the graph.the first event is to acquire the threshold signals and its displayed in the graph as a feedback.after the first event is executed, i will call the second event,where the further signals are acuired and compared with the threshold signals from the event 1.my question is how can i use the same front panel control in more than two events in the event structure?please answer me i'm stuck.
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Hi,
I have attached here an example of doing the same using shift registers and local variables. Take a look. Shift register is always a better option than local variables.
Regards,
Nitzz
(Give kudos to good answers, Mark it as a solution if your problem is Solved)
Attachments:
Graph and shift registers.vi ‏12 KB
graph and local variables.vi ‏12 KB

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.
There are only two ways to tell somebody thanks: Kudos and Marked Solutions
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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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Joe.
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Event structure doesn't handle all events from external DLL source

Hi!
I use a DLL, wich handles an USB CAN transceiver device, and generates LabVIEW user events with extcode.h and PostLVUserEvent() function.
In my vi I use an event case structure to handle theese external events. The problem is, that if the events come too frequently, then it cannot handle all events.
The vi contains a couple of parallel while loops which process the incoming data from the external event.
In another application I use the same architecture, and that works fine. This one is more complex.
Do you think I have reached the limits of the program? Or what else can be the problem?
I have tried to use a queue in the event structure, it helped a little, but yet, not all the events are handled. My external DLL sends all event, so the problem is not there.
Thanks in advance!

Hi Wasz,
Thanks for the post and I hope your well.
It is not possible for the event structure to miss events - it simply queues them up. To keep the event structure 'in time' with the code you must ensure the code to execute in each event is minimal to allow the event structure to handle the next event.
Please see this two links:
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What sort of events are not being handled? Could it be an issue your events are not configured correctly? Maybe if you could produce a small example in LabVIEW code, so we can just test the event structure configuration... someone working around the external dll call - which you seem sure is working correctly.
In terms of queuing to process the events in other loops is certainly an option to speed up the event structure. To do this, use a produce/consumer design pattern.
hope this helps,
Kind Regards
James Hillman
Applications Engineer 2008 to 2009 National Instruments UK & Ireland
Loughborough University UK - 2006 to 2011
Remember Kudos those who help!

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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Nederlandse LabVIEW user groep www.lvug.nl
My LabVIEW Ideas
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Event structure with sub-VI

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

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