Structure of the event - Access Lock front option Programatically - VI Scripting

Similar Questions

• Front panel locked, but not due to the structure of the event

  Hi it LV community.

  I did a staemachine program that executes an oscilloscope (screenshot of a provided below... the State of the problem). I ran my program yesterday and it worked very well. Then, like a model, a dialog box opens and I just clicked on it in a hurry. now my front hangs as soon as I move the above-mentioned State "the Oscilloscope settings.

  As indicated, I have go a repeat loop that collects successive impulses of my oscilloscope and displays on the front panel (it works fine). In parallel, I have a structure of the event that makes the tail for the real-time feedback of changes to parameters that I placed on the façade (exodus of state change).

  Here's the problem: as soon as I State 'Oscilloscope Settings' using a Boolean button on the front panel for get me there, the front hangs... No event triggered by this point, and even if it did, I already deselected the "Lock panel until the end of the matter for this event" checkbox in the case where the structure menu.

  So WHY is my front lock now? Thoughts anyone?

  Read the detailed help for event structures.

  He urged that a single event structure serve in a VI. There are moments where more can be used effectively, but caution and a thorough understanding of the structure are needed.

  The problem is that you have several structures of the event in the various cases of the state machine and they are set to respond to the same events.

  When the button Set Oscilloscope, the structures of the event in the purchase Menu and home screen States receive the event. The two lock the screen, but only one of these cases may work. It can transfer control to the State of the Oscilloscope settings, but the other event responding to this same event structure maintains the locked Panel.

  The solution is not not to release any of the event. The default value is usually the best setting. The best solution is to spend on an architecture of producer/consumer (events). Who uses two parallel loops. The producer has the one and the only structure of the event and passes orders to consumer loop through a queue.

  Probalby want as the mechanical action on the buttons to lock when you press. Put kiosks inside the respective case of event changed value and local variables becomes unnecessary.

  Lynn

• Set priority higher for front panel events in a Structure of the event

  Hey people,

  I need some advice on the management of events in Labview 2013... I have a structure of the event which handles events of façade (keys) as well as some user events. User events come thick and fast from an external dll. The data as well as this event gets queued at the start and then traced / processed.

  The tricky part is if there are great number of events of the user, the response to the event of the façade is significantly delayed. I get about 80 events back to back user every two seconds. So, if I press a button on the Panel before every two seconds (2 seconds, 4 seconds, 6 seconds... etc) is obviously the delayed answer as opposed to pushing in multiples of 3 seconds (3 seconds then 6 seconds, 9 seconds...) where the reaction is immediate.

  Now I know labview 2013 supports two prioritres while generating events (high & normal) but the problem is in my case, user events come from a dll using the 'PostLVUserEvent' method that does not accept a priority. And I don't see a way to set a priority for the events of façade (keys).

  Any thoughts on how this can be managed?

  Thanks in advance, best regards, Abel.

  The best solution would be to separate user and events of the FP in two independent loops, but I understand that this may be difficult if the two event classes operate on the same data.

  Another possibility is to use two loops serialized, encapsulated together in a larger loop, each containing a structure of the event: the first, with a short timeout, would manage the FP events and could go out on timeout. the second would deal with all user events and would be forced to stop after a predefined number of events managed or, better still, when a quantity preset time has elapsed.

• Structure of the event in a state machine

  Hi all

  I have a state machine with a sort of stand-by, where a user can select the next button state. I tried using a structure of the event with changing the values to select the next case, but when the state machine is in a specific case and the button of another State on the blocks of all things. I've attached an example, the lights simply stating that you are in the State.

  Thx for your time,

  Bert

  Edit: actually, I miss-clicked

  1. you have not need a while loop around the structure of your event.  With no wired time-out, you will never get a timeout event.

  2. your button events are set to 'Lock Front Panel until end of the event'.  Uncheck the box which.

• multiple messages from several loops in the structure of the event

  Hey guys,.

  I have two questions, first of all, what is the best way to receive messages in case of structure? I've been watching the user events, and which seems to be a good option if I want to never send a single message. Ive never found an example where the regester for events has a second event its looking. I currently use queues to the structure of the event to my other loops.

  My second question is I want to even send messages to the structure of the event, my current thinking is that it would make things easier to follow if the structure of the event sent all messages to the individual lines. Is it more appropriate to have just a loop of talk directly to one another through the queues already in place?

  IM thinking ill put in place a user for handlng errors event but I'm not sure on other messages.

  Thank you guys

  You can get events for individual events. Better yet, you can use clusters to group the different events and access them individually (see below).

  

• Programmatically trigger a structure of the event with the value (signaling) is not responding

  Hey, in my attached program I check if the two steps of translation are in a specific position. If Yes, I want my code to execute a sequence of movements. If this isn't the case, I'm asking the user if he wants contributed from this position anyway. It has three options: Yes, go to load (the specific position) and cancel. If he hits Yes, I am using a property of signal value which should update the controls Boolean true, allowing the sequence. Cancellation and work "to load" perfectly fine, but 'Yes' does not work. I think I need a structure of the event to ahndle the value of the Boolean control 'x' change event, however, the addition of this structure of the event for some reason any even do not allow me to click on the Start button of the procedure.
  Thanks for any help in advance.
  Doug

  Really, you should look into using a State Machine.  You should have really not what happens inside a structure of the event.

  In addition, I would like to use a shift register to store this value instead of a front panel control.

• structure of the event within the structure of the case? error or limitation of LabVIEW?

  Hello

  I am trying to reach a structure of the event within a box structure. The event is triggered by a mouse event (mouse down, move to the top).

  This vi tries to simulate behaviour of the device with a sensor, so the mouse triggered the structure of the event, won't be there in real working environment, so I can't remove the structure of the case.

  But as I noticed that if I try to click on the drawing (that my mouse events are triggered with) before activating the Boolean condition of 2D, I can access is no longer the component front (button, leads, etc.).

  They seems to be frozen. But if the case is true before you try click on the 2D drawing area, everything seems to work well.

  Is - this protected by a kind of LabVIEW bug or there is a limitation?

  These are my screws.

  Thank you

  

  Hello Nefertari,

  Use a Standard Architecture.

  I changed the code. I hope now that its fine.

  Please find the code updated the joint.

  LV 2012.

  Kind regards

  Leila

• Sub - Entered VI buttons activation do not Structure of the event

  Hey everybody,

  I have anissue with a Subvi, which takes a user file, play with the type of path of file data until it is in the form of a string, and then puts it in an array of strings in a list box. The issue I'm having is that I created the entries and exits to the buttons in the image, but the case event structures they control are not running when I press the buttons that are connected to the terminals of the Sub VI (the buttons move up one level in the image below).  They DO not work when I use the Panel front of the Subvi rather than on the front of the VI Panel that comes up to the next level.

  So far I have tried:

  -Move the buttons in the while loop

  -Move the buttons in the structure of the event

  -Case change event handling to run on a mouse click of the button from a change in value

  Thanks in advance for any help anyone is able to give me!

  Yes, writing a value to a Terminal never causes a value change event.  Think of it as an event "user has changed the value.  To trigger an event value programmatically, you must write to the Value property (Signaling) of the command or the change indicator.

  Values Boolean locking belong in cases that handles the VC event.

  You could read the terminal (use a local variable) before the time compare loop to the last value (use a feedback node) and use a case structure to determine if you want the event to VC based on the value passed in the appellant.

• When to use the structures of the event

  I wrote several applications using the state machine architecture.  Generally, these applications have two buttons (I created), a race and give up.  The abort button interrupts the guide and goes to a State of inactivity which loops until the run button is selected.  One thing that I don't like, my programs ending up with one or more local variable for the Cancel button.

  (1) should I use structures event for these types of programs?

  (2) is a program of event also structure a state machine?

  Why would you need local varables for the button abandon? Do simply lock action so it resets automatically.

  If your loop by turning in any case (e.g. for updating views) migh ask both controls. Any necessary event structure.

  ggress1 wrote:

  (1) should I use structures event for these types of programs?

  (2) is a program of event also structure a state machine?

  The event structures are mainly for the manipulation of interaction of the user on the front panel. I encourage you to learn more about the structures of the event so you can make an informed choice on the best architecture of code for a particular programming problem. Maybe you should show us some of your code so that we can decide by using the event structures should improve things.

  A program with event structures is generally much less forgiving of the rookie mistakes. Used properly, they can easily lock your program.

• Update the reference in the structure of the event

  Hello

  I would really appreciate if someone can help me with the next issue:

  I have a main VI with the structure of the event in the while loop.

  There is a case of a button initiating the Subvi, which extends an engine.

  To stop the loop inside the Sub - VI I pass a strict type reference him out of the main façade of VI.

  The problem is that in the event structure is not updated to reference, i.e. on press the abort button I can't stop the engine.

  The strange thing is that, without the structure of the event (only in time loop) it works. I try to put the button on the outside another loop: it does not depend on it. Without the structure of the event - everything works.

  LabVIEW 2012 32 bit

  Thanks in advance,

  Dirs

  You have the checkbox in the case where the matter set to Lock the front until the end of the case of the event?

  Is the case of the event start quickly, or is it stuck in the Subvi?

  Have you put in custody and recommendations for using events in LabVIEW - LabVIEW 2013 help ?

• How can I use the same graph of façade in several events in a structure of the event?

  I want to display my sensorDAQ signals in a graph.but I have more than one event in the case where the structure to acquire the signal and display it in the first round of graph.the is to acquire signals from threshold and its shown in the graphic as a feedback.after the first event is executed, I'll call the second event, where the other signals are acuired and compared with signals from threshold of event 1 my question is how can I use the same control on front panel in more than two events in the structure of the event? Please answer me I am stuck.

  Hello

  I have attached here an example of doing the same thing using local variables and shift registers. Take a peek inside. Shift register is always a better option than local variables.

  Kind regards

  Amine31

  (Bravo to give good answers, mark it as a solution if your problem is resolved)

• Stop the execution of a loop in a structure of the event

  I tried searching the forums to avoid posting a duplicate, but more I couldn't open most of the vi as they were higher.

  I put in a dummy while loop in an event structire I intend to use. Once I have begin to execute the while loop, I am not able to stop using a control for some reason any the fornt panel control.

  I am not able to change the vale of the shutdown command at all. I tried to create a separate event for the STOP, and I still couldn't stop the program when the While loop was running.

  I guess I'm missing something really small. I would appreciate your comments on this.

  Thank you

  Nevil

  Right-click on the structure of the event and choose 'edit events' in the case that gives you bad.

  Make sure that the check box lock the front panel is not checked.

  I suspect that yours is checked, so your front is locked until the end of the event, so you can never stop your loop.

  

• Structure of the event with sub-panels

  Hi, I tried to find a simple example with a structure of the event and only two sub-panels.

  I found the 'new Event Handler.vi' and I'm doing something with two sub - vi I did 'Add.vi' and 'Mul.vi '.

  To be able to switch between the two sub-panels used in 'New Event Handler.vi', the programmer used a "time surge" which I can't locate

  anywhere, so I just copied 'new Event Handler.vi '.

  I can't get this to work.

  Take a peek inside the world

  Sincere greetings,

  Lasse

  Hi Lasse,

  Yes, there is. If you open the properties of the subVIs Add.vi and Mul.vi (Ctrl + I), you can change in the tab 'appearance of the window' to that custom... There is an option display front panel, when it is called and the close later while initially closed just sellect them. Then, you will have the effect of 'pop up' :-)

  I slightly changed the example, so that can see them in the form of pop-up windows.

  See you soon

  Angel

• How to use the structure of the event to sort the listbox data?

  I have a VI that contains two list boxes.  The two list boxes are selectable by the user.  This is how I want to interact.

  When the VI is initialized, the first list box will be filled with data.  If the user double clicks on a cell in the first list box, the second list box will be filled by a sorting of the information contained in the first list box a certain way.  I do not think that the details of how these data are sorted is pertainent here...  Then I want the user to be able to double-click on one of the lines in the second list box.  The double of the item clicked in the second list box will be used in an another VI which will then start.

  I have my VI of work such that the first list box will fill the second list box whenever the user double clicks on a cell in the first list box.  To do this I use a structure of the event.  Here is where the trouble begins.  I have a second structure of the event look for double clicks in the second list box, but when I do this, the program crashes.  In addition, I want only the user to be able to double-click on the second list box, if the first list box has already been double-clicked.

  Generally, my question really revolves around the use of the structures of the event in this application?  Can I use two structures of event at the same time?  Is there a better way to do it?

  No, you probably should not use two structures of different events. One, it should work fine.

  The Subvi immediately execute and return? If not and you have the front locked until the event finishes, which would explain what you see.

• Structure of the event in primary vi and sub - VI with queues

  Hi all

  I have an application that uses the architecture of producer-consumer in which a queue transmits messages of a main VI by a Subvi, in response to the events of the user in the front panel. Inside the Sub VI, the queue is removed and treaty based on the corresponding message, and the result is displayed on the façade the sub of VI. User events are captured in the main VI using a Structure of the event. This works as expected.

  However, I also the controls on the Panel before the sub - VI to change the queue. My approach is to have another structure of the event in the VI sub for this. However, while the events in the main work of fine VI, events of sub - VI never treated.

  A simplified sandbox VI of what I'm trying to do is attached. As you can see, the main VI events are triggered as expected, but events in the sub VI are never triggered.

  I watched this white paper: detect an event in a Subvi from a high level VI , but it's not exactly what I'm trying to do. Instead, I'm just trying to detect an event generated within the Subvi. I searched this forum and found some research related, but none of them seemed to answer what I'm trying to do.

  Thank you

  Matt

  Your major issue here is the loop location.  While the structure should be inside the Subvi to make a message in the appropriate queue manager.  In fact, you should have 2 loops within your Subvi: 1) the QMH and (2) of the event loop.  You must use a user event to congratulate the event loop in the Subvi to stop.  You should NOT use the time-out of the Structure of the event unless you absolutely must.  And since everything in the Subvi is the message function, you do not have expectations.  They will be inactive (no CPU using) when there are no items to process from the queue or queue.