Dynamic Event to handle 12x12 Array or Cluster UI

I'm looking to handle up to a 12x12 array/cluster to enable different LEDs. The enable method will be two numeric controls, MxN, which will light LEDs in a specific order based on the MxN control data entered. The specific order is right to left, bottom to top. Right now, I have only a few states functional, but I have to account for every state as shown in my block diagram. I'm looking for some feedback on how to handle this dynamically. I am aware of the Register For Events, but lack the experience to understand if this is the route I should take. Thanks in advance to all who respond!
Examples
2x2         3x3
4|3          9|8|7
2|1          6|5|4
               3|2|1
Solved!
Go to Solution.

Why are you making the array a control? Why not just make it an indicator so you don't have to use the local variable?
Also, make sure your stop button is actually in a Stop Button:Value Change event case. You will not be able to stop your VI as is written.
There are only two ways to tell somebody thanks: Kudos and Marked Solutions
Unofficial Forum Rules and Guidelines
Attachments:
2DArrayTest_MOD.zip ‏6 KB

Similar Messages

2012 Dynamic Event Registration Array of Controls

In upgrading to LV2012, I have discoverd what may be a bug, or at least an incompatability between 2011 and 2012 with respect dynamic event registration of an array of controls as opposed to individual control references.
This bit of code worked in 2011 but doesn't in 2012, with error 1 generated at the reg events block when run in 2012. I have been in contact with technical support, but haven't yet heard their take on this.
Any thoughts.
Solved!
Go to Solution.
Attachments:
Top Application.png ‏13 KB
SubVI.png ‏23 KB

I've got the bug too -- it appears this bug is present when arrays of control refs are connected to the ConPane. Link to cross-post on LAVA about the original problem. As Patrick@Vision mentions above, one workaround is to ensure that the array of control refs is no longer on the ConPane by collapsing the Register for Events node onto the caller.
a.lia-user-name-link[href="/t5/user/viewprofilepage/user-id/88938"] {color: black;} a.lia-user-name-link[href="/t5/user/viewprofilepage/user-id/88938"]:after {content: '';} .jrd-sig {height: 80px; overflow: visible;} .jrd-sig-deploy {float:left; opacity:0.2;} .jrd-sig-img {float:right; opacity:0.2;} .jrd-sig-img:hover {opacity:0.8;} .jrd-sig-deploy:hover {opacity:0.8;}

Dynamic event registration - FP not in memory ?

Hello,
I have problem that I don't understand tith dynamic event registration.
In my app I have many threads that are initialised when app starts and I switch between them using subpanel.
In one of this modules I want to register some dynamic events to find whitch controll in cluster was pressed.
Why I get error 1001?
I have static reference for all modules in main thread. I start modules but I don't open their FP.
Solved!
Go to Solution.
Attachments:
err.png ‏30 KB

Well your image is confusing because you can't run without wiring that reference. But if you did do that then the error comes from the fact that your VI doesn't have a front panel that is open when you register for it. So that control reference doesn't really exists. I mean it exists but you can't reference a control that hasn't been opened.
I think what you'll want to do is open the front panel, but then set it to hidden. Then after the front panel has been opened, and hidden, register for the control event.
Unofficial Forum Rules and Guidelines - Hooovahh - LabVIEW Overlord
If 10 out of 10 experts in any field say something is bad, you should probably take their opinion seriously.

Array of Cluster with event structure

Hi,
I am having Array of cluster with cluster having 1 String Control , 1 Combo box, 1 Led control and 2 Numeric control. In the combo box i am having two options to select ('Binary' and 'PWM').Whenever Binary is selected then Led control has be enabled and whenever PWM is selected 2 Numeric control has to be enabled.
Is there any way to do this??
Pleas help me...
Regards
Meenatchi

actually in my application, the front panel has to have 16 rows of controls (1 string control, 1 combo box, 1 Led control, 2 numeric control).so i planned to keep all those controls in a cluster and create one array.If i didnt so i will have 16x5 controls in my front panel and i have to put 16 event cases for each combo box to do the enable and disable of controls..
is there any simple way to do this..i have attached my front panel view
Attachments:
Untitled10.vi ‏139 KB

Dynamic Event Handler

I'm looking for a dynamic event handler subscribe/unsubscribe process, something like this:
foreach (Control ctrl in form.Controls)
if (ctrl.GetType() == typeof(TextBox)
TextBox tb = (TextBox)ctrl;
if (tb.Name == "tbLocationName")
==>tb.TextChanged -= new EventHandler(tb_TextChanged);
Is this structure possible? Currently, I have to iterate a literal list of controls and I'm looking for something a little more compact.
timSF

You could create a MethodExtension for that :). Method extensions need to be declared in a static context, so to keep things organized you can create a seperate static class for all your MethodExtensions (or group them by category).
Here is an example:
using System;
using System.Collections.Generic;
using System.Windows.Forms;
namespace ExtensionExample
public partial class Form1 : Form
private List<TextBox> _unsubscribeList = new List<TextBox>();
public Form1()
InitializeComponent();
textBox1.TextChanged += Textbox_TextChanged; //Subscribe to event
textBox2.TextChanged += Textbox_TextChanged; //Subscribe to event
textBox3.TextChanged += Textbox_TextChanged; //Subscribe to event
textBox4.TextChanged += Textbox_TextChanged; //Subscribe to event
textBox5.TextChanged += Textbox_TextChanged; //Subscribe to event
FooBar();
public void FooBar()
_unsubscribeList.Add(textBox1); //Add Textbox1
_unsubscribeList.Add(textBox5); //Add Textbox5
//'this' == our Form => Method Extension
this.TextBoxes_Unsubscribe(Textbox_TextChanged, _unsubscribeList); //Call Method Extension
private void Textbox_TextChanged(object sender, EventArgs e)
var txtbx = sender as TextBox;
Console.WriteLine("Text Changed: " + txtbx.Name);
//Method Extensions need to be declared in a static context (static class)
static class MyWinFormsExtensions
//Form class method extensions, 'adds' this method to the form object and can be called from everywhere (on a Form)
//This is an easy way to add extra functionality to all kinds of types (note the 'this' keyword before the Form argument)
public static void TextBoxes_Unsubscribe(this Form form, EventHandler handler, List<TextBox> unsubscribeList)
foreach (Control ctrl in form.Controls)
var txtbx = ctrl as TextBox;
if (txtbx != null)
if (unsubscribeList.Contains(txtbx))
txtbx.TextChanged -= handler; //Unsubscribe from the event
Thomas Goussaert - www.digitalartsandentertainment.com (DAE)

How to create dynamic event handler methods?

Hello!
Is it possible to create dynamic event handler methods in the views of WDC and then subscribe to an event of another WD component completely dynamically.
Many thanks,
Smitha.

By first realising AJAX is not Java but JavaScript and then reading a tutorial on JavaScript DOM manipulation and then by reading a tutorial on AJAX and then by applying your knowledge and then in the end by integrating it in your JSP.

Connect 1 D array of cluster of 2 elements with dynamic data

Hello
The type of source is 1D array of cluster of 2 elements and the type of sink is dyanamic data. Can any one guide me how to connect these 2 elements together. Any response would be highly appreciated.
Thanks

First, this question would more appropriately be posted to the LabVIEW Board. It is not a signal conditioning issue.
The dynamic data type (DDT), sometimes referred to as the "evil dynamic data type," completely obscures the internal data structure. The only way someone could help is if you tell us what the source is expecting the internal data structure to be. The only objects which want DDT inputs are Express VIs, which are also good at obscuring thier contents. Implementing the sampe funcitonality with standard VIs might be a better approach.
You also have not completely specified the source. What are the data types of the cluster elements?
Lynn

How do I convert a 1-D array of cluster of 5 elements into a 2-D array of numbers? (history data from a chart)

Hello,
in my vi I have a chart with 5 Plots displaying measurement data.
The user should be able to save all the history data from the chart at anytime. (e.g. the user watches the chart and some event happens, then he presses a "save"-button)
I know, that I can read out the history data with a property node. That is not the problem. The problem is, how do I handle the data? The type of the history data is a 1-D array of cluster of 5 elements.
I have to convert that data somehow into a 2 D-array of numbers or strings, so that I can easily save it in a text-file.
How do I convert a 1-D array of cluster of 5 elements into a 2-D array of numbers?
I use LabVIEW 7.1
Johannes
Greetings Johannes
Using LabVIEW 7.1 and 2009 recently
Solved!
Go to Solution.

Gerd,
thank you for the quick response and the easy solution.
Look what I did in the meantime. I solved the problem too, but muuuch more complicate :-)
And I have converted the numbers to strings, so that I can easily write them into a spreasheet file.
Johannes
Message Edited by johanneshoer on 04-28-2009 10:39 AM
Greetings Johannes
Using LabVIEW 7.1 and 2009 recently
Attachments:
SaveChartHistory.JPG ‏57 KB
SaveChartHistory.JPG ‏57 KB

Dynamic Event Registration Error

Hi,
I'm getting to grips with Dynamic events in LabVIEW. However, I've encountered an issue i'm not sure on. When I try to register a cluster of control refs to the Register for Events function I get an error.. See Dynamic Event Registration.vi for small vi highlighting the issue.
Thoughts?
Strokes
Attachments:
Dyanmic Event Registration Error.vi ‏9 KB

Steve Chandler wrote:
You can wire a reference or an array of references to register for events. Of course you probably already know that you have to wire the output of register for events to the dynamic registration terminal of the event structure.
Steve Chandler wrote:
You can wire a reference or an array of references to register for events. Of course you probably already know that you have to wire the output of register for events to the dynamic registration terminal of the event structure.
That helped me somewhat, however, I'm still experiencing problems. My events seem to be registering correctly but don't seem to generate when I trigger them. I've configured the event structure to execute should one of the controls in my cluster change value. However, the only event case that get's executed is the timeout case.
I've attached a vi highlighting my problem named Dynamic Event Problem.vi. My real vi is much larger and contains many sub vis so hopefully what I've attached suffices..
Attachments:
Process Data Control Refs Edit.ctl ‏14 KB
Dynamic Event Problem.vi ‏22 KB

Dynamic event registration wont work with Tab control

In LTR volume 11 No1 we find the "Dynamic Event Handling.vi".
I had placed the controls on a Tab control and now this example wont work.
Is there a solution to this problem?
Scientia est potentia!
Attachments:
Dynamic_Event_Registration.vi ‏51 KB
Dynamic_Event_Registration(controls_on_Tab).vi ‏64 KB

Yes. The first stage of the code registers mouse down events for all the controls. When you added a tab control that meant that a mouse down event was registered for the tab as well. So now when you click on an object on the tab LabVIEW must decide whether to fire the mouse down on the tab-event, or the mouse down on the object on the tab event...It goes for the first but since there is no description for the tab no dialog will be displayed. If you add a description for the tab you'll see that it fires the event with the tab and you get a dialog with the tab description.
So - how to fix. Well, it's not that simple, one might think that to exclude the reference to the tab when you register the events would do the trick, but it rather seems that LV will always t
hink mouse clicks are on the tab and not on the objects on the tab.
The solution though is to get the references to the objects by reading the controls on page property of the tab control. So instead of reading the controls array from the front panel read the pages references of the tab and then the controls on page array from that and then register mouse down events on that array.
MTO

Resetting a variable in an event structure (dynamic event)

I'm working on moving an event structure into a sub VI. This means I have to register dynamic events.
The event structure is handling some button clicks. The state of the button (mechanical action = latch when released) resets itself automatically as long as the variable is placed within the value change case. Leaving the button in this case is not possible when the event structure is put in a sub VI and the variable is located in the parent VI. How do I make sure the button unlatches after clicking on it? I have attached an example where all the code is in one VI (the local variable must be moved outside the event structure in order for it to be moved into a sub VI). Any ideas?
If you open the VI and run it, you can click Start which will cause the counter to start incrementing. The button only unlatches as long as the variable is located in the value change case.
(Btw, how do you put images inline in a post?)
Rob
LV2011,LV2012,LV2013
Attachments:
img.png ‏18 KB
main.vi ‏17 KB

Race conditions are the primary reason not to do that. But since your treating your variable as a latch, I doubt your using the value you read from it anywhere, and in that case it can't create a race condition. There's also the possibility that the control's reference could become invalid. But since this is a sub VI of the control's VI that can't happen (even if it could you can check the error out of the value property node to see when it happens and deal with it).
I'm not sure about the flickering, Since I can't seem to duplicate it with a simple test case on my machine. It might related to whatever else you're doing in the event apart from reseting the value to false.

Add element to array of cluster

I have an array of cluster. Cluster contains two elements. How to add an element in cluster at run time on the second position efficiently? In other words dont want another copy of cluster which contains three elements and copy the original two elements plus the new element.
Original array of cluster lets say has two element Temp1 and Pressure 1.
Need to add another element in cluster and now the array of cluster will be Temp1, Volt1 and Pressure 1. So Volt 1 is added to all cluster elements at second order throughout the array of clusters programatically.
CLD,CTD
Attachments:
TestAddElementToCluster.vi ‏10 KB

It is unclear from your original post what the problem you need to solve actually is. Are you trying to create a user interface? Do you need to dynamically add arbitrary data to a data set, or is it a fixed set of functionality that can be dynamically changed in predetermined ways?
Having done it, I will recommend you not try the scripting and subpanels approach. There are almost always better ways.
Remember that your data structures do not need to mirror your user interface. If you were trying to display the temperature, voltage, and pressure data to the user, a multicolumn listbox may be more appropriate than a raw cluster in an array. Internally, this would allow you to maintain the temperature, voltage, and pressure as separate arrays and only display the ones you want in the listbox.
Please give us a more information on the problem so we can help you with an easier solution.
This account is no longer active. Contact ShadesOfGray for current posts and information.

Dynamic Events Problem

I am fairly new to LabVIEW and I am trying to make a GUI that uses
events to pass messages between three separate event loops, GUI,
Messaging and Logging. GUI controls the state of the other two event
loops by generating control events and using semaphores. While the
messaging semaphore is released by the GUI, Messaging generates
messages and raises them as events. Some message events are handled by
the GUI event loop and others by the Logging event loop. Logging, once
it receives a 'logging ON' control event dynamically registers for
certain message events and logs the message events it handles to file.
When Logging receives a 'logging OFF' control event, it dynamically
unregisters the message events. The logging control events are
registered for the life of the Logging event loop.
I have created a cut-down version of my GUI that exhibits the same
problem. The problem is that after I have turned Logging on and off
once, it no longer responds to logging control events from the GUI.
Even though the GUI is still generating the events. I have looked at
the dynamic logging example in LabVIEW and thought I did the same sort
of thing but I just can't get it to work that way. The only way I got
it working was by creating a clean event registration with all events
each time I want to change the event registration. This is how I have
done it in the example file and it works. But I don't want to use this
method, I don't want to have to re-register the control events each
time I unregister/register message events.
If anyone knows what I'm doing wrong please edit the example vis and post them back.
Notes for the example:
Files are LabVIEW 7.1.1
Just open the front panels for all the vis before running the GUI vi.
The Display vi just does the same thing as the logging vi.
Run the GUI vi and turn on Messaging then turn Logging on and off a few times.
The example works, but if you wire the event registration refnum
input when doing dynamic event registration, Logging will only turn on
and off once, then no longer respond to log control events... what's
going on?

I can't tell you how to solve you problems - without code this is always quite tricky.
But in case you want to log messages to a log file, have a look at this thread
http://forums.ni.com/ni/board/message?board.id=170&message.id=172117&view=by_date_ascending&page=1
where I posted a logging-library.
Maybe it is a useful help for you.
Thomas
Using LV8.0
Don't be afraid to rate a good answer...

Extending EventDispatcher with dynamic event types

I'm currently trying to write my own class to extend the
EventDispatcher class. My goal is to create a Service class which
acts as a switchboard for incoming socket data. Incoming socket
data is parsed to create an Event which is Dispatched to the
appropriate Service object which dispatches the event to any
registered listeners.
The problem I'm having is that I'm confused about how to
handle the event types -- the string parameter which is always
supplied as the first argument to the addEventListener() function.
In all the examples I've seen, the value supplied is a class
constant like MouseEvent.CLICK or VideoEvent.READY. In the case of
my application, I want the developer to define their own Event
types without having to go and edit my class files. In other words,
I'd like to use dynamic event types with my class--maybe something
like the code I've attached.
I'm not new to Actionscript but am very new to the
EventDispatcher class. I'm wondering a bit what that first
parameter really does in a strict programming sense -- i haven't
seen it explained all that well in the piles of documentation I've
read on the Adobe site so I don't really know if I need to define
my own Event class or what and whether I have to define all those
possible event type constants/strings in advance or what.
Any help/advice would be much appreciated.

I have looked it up here:
Actionscript
3.0 Language Reference
and it just says that the first arg to 'addEventListener' is
"The type of event" with no further explanation at all.
I have read this:
Flash
Quick Starts: Programming With Actionscript 3.0: Event handling
It doesn't help much either. It tells me I need the
appropriate event object which makes me wonder DO I NEED MY OWN
CLASS? For that first ard to addEventListener, it merely says
"Substitute the appropriate constant". Given that I want to use
dynamic types (i think so anyway) that is not helpful information
either. Every single example on that page uses a class constant for
event type.
It links to
this
which says "First, the name of the specific event you want to
respond to. Once again, each event is affiliated with a specific
class, and that class will have a special value predefined for each
event--sort of like the event's own unique name, which you should
use for the first parameter." Still no useful detail about what
that arg does and the insistence on constants.
The quick start page also has a link title "Handling Events"
in Programming ActionScript 3.0 but it links to some documentation
titled "Working with XML". The only discussion of events in that 10
or so pages is because some user posted a comment.
I have read this
entire
article which is more helpful than anything in the flash docs
but still doesn't answer all my questions which (AGAIN) are:
1) What is the real function of the first argument to
addEventListener? I have not seen a clear explanation anywhere.
2) Do I need to write my own Event class?
3) What about dynamic event types that are defined at
runtime? Are there any pitfalls or risks that arise from using a
string instead of a predefined constant as the first param to
addEventListener() ?
Please stop telling me to read the documentation. I've been
reading it for days.

How can we change the name of dynamic events selector label in Event Structure

When retriving references to Control that are contained in a cluster. The default name that
appear in the Event Structure is: : Mouse down.
I have found a workaround to correct the problem. But I would apreciate a more convinient way to do this.
This is the workaround I found to change the names in the Event Structure
I cast the References using a Reference constant and I change the label of
that constant.
See the VI for more detail. It is well commented.
Is there any way to change the name of a dynamic event without doing the
cast trick?
Attachments:
DynEventStructureName.vi ‏44 KB

I agree!
I can't top this approach.
Ben
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction

Dynamic Event to handle 12x12 Array or Cluster UI

Similar Messages

Maybe you are looking for