Filling large array into multicolumn listbox

Hi,
I need to fill a multicolumn listbox with a large array. I feed a 2D array into the ListNames property. The problem I am having is that if the array is large (+1000) it is taking forever to update the itemnames. Is this because the listbox is going through a resize? Is there someway to intialize the ItemNames array to speed up the insertion. It is also slow if the next array insertion (overwrite) is a small array.
thanks Michael

Hi Michael,
Please take a look at the attached VI.
This VI allows the user to programmatically (during run time) write data to a multicolumn listbox. The VI uses the control reference to a multicolumn listbox, so this VI will work on any multicolumn listbox. The VI has inputs for the 2D array (of strings), and a start location (row and column) where the zeroth (top left) element goes. The VI returns the end row and end column of the multicolumn listbox. This is useful for writing successive entries to the listbox.
In this vi, I am currently writing a 1000*10 2D array to a multicolumn listbox and it runs very fast.
Regards,
Ankita A.
Attachments:
programmatically_writting_a_2D_array_to_a_multicolumn_listbox.llb ‏104 KB

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How to write into multicolumn listbox during runtime?

Hi,
I am able to edit into multicolumn listbox. But i am not able to write into empty boxes... How to do that???
Regards,
Amit

Hi Amit,
Have you initialised the item names with any default values? If not try initialising the item names to a 2D size that will be large enough for you're requirements. Once this size is set in edit mode you can't enter data at runtime outside of this initialised area.
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Entries into Multicolumn Listbox/Safing Data in .txt-file

Hello. I haven't found anything helpful for my problem or better to say problems. I have to do a task that I have no idea how to solve. It isn't helping that I was never good with programming. Here is what I have up till now:
I want to write seven strings indivudally into a multicolumn listbox with seven columns. The first shall be a running number, increasing for every row. For this I'm using right now a Case Structure. And there is my first problem. I don't know how to realize that whenever a row is completed the next string is written into the next row instead of overwriting one in the completed row.
This has to go one for as long as the user wants to. Then there has to come a Pop Up Window - if that's the correct term - and shall ask the user if he/she wants to safe the created list into a textfile. And that's my next problem. I have no idea how to program that.
I know it's probably rather easy to program these things in LabVIEW 8.0 (which I'm using) but as I've already said I'm anything but good in programming at all and to make things even more complicated I don't want to do this task, therefore not putting all my energy into it as a result.
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Does it have to be a multicolumn ListBox?
Seems like a table might be more appropriate, if it's only for display purposes.
Either way, you need to use a FOR loop inside a FOR loop to generate a 2-D array of strings.
The INNER loop generates the strings for each column in a row, the OUTER loop generates each row.
You wire the 2-D array directly to a TABLE indicator, or to the ITEM NAMES property of a ListBox.
Attached is a pic.
Message Edited by CoastalMaineBird on 08-21-2007 01:52 AM
Steve Bird
Culverson Software - Elegant software that is a pleasure to use.
Culverson.com
Blog for (mostly LabVIEW) programmers: Tips And Tricks
Attachments:
TwoLoop.png ‏226 KB

Regarding Array to Multicolumn Listbox data's manipulation

Hi - I want to display the above mentioned array in muticolumn listbox with 2 columns , first column needs to be belongs to array [0] (Date and time ) and second column needs to be belongs to array [1] and array [2] ( Cone and Vane strings).
I have tried to implement the same, please go through the attached VI and I cannot make the above mentioned array data's into two column multi column listbox data's (that is , can't able to display the array [1] and array [2] data's in single column.
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Attachments:
Cone and Vane Operations_Final.vi ‏60 KB

Well, your VI is a complete mess and has several CPU burner loops that run as fast as the computer allows. There is also a lot of duplicate and overly complex code. Programmed correctly, code with all this functionality could probably fit on a postcard.
Anyway, for just building the multicolumn listbox, here's somewhat simpler code. Hopefully you can adapt it to your problem.
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Attachments:
Cone&Vane.vi ‏8 KB

Is it possible to make a line of a multicolumn listbox active?

I currently have data entered into multicolumn listbox. While the program is running, is it possible for a row of the listbox to be selected and then give the index number of that row? From there I will want to use that index number to reference other arrays, but right now I'm just dealing with getting the index number I need from the user's row selection.

lmtis wrote:
The I32 is the default numeric constant, I didn't see the need to change it for this purpose.
You missed my point. The output datatype of the Value property node is an I32. You are wiring to an I32 indicator, but shoving it through a TypeCast function. This is pointless.
Message Edited by smercurio_fc on 06-20-2008 12:12 PM
Attachments:
Example_VI.png ‏4 KB

Read write multicolumn listbox

Hello!
Please help! I can not understand! How to write and read data from a file into multicolumn listbox? Please give an example. I have a multicolumn listbox size of 10 rows of 10 cells.
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Solved!
Go to Solution.

You can read/write to/from its ItemNames property.

How to enter two different arrays into two columns of a multi column listbox

Hi All,
I have two different arrays of values suppose 1 array A(1,2,3,4,5) and another array B(3,4,5,6,7). I want to write these to arrays into a multicolumn listbox such that 1st column would be array A and 2nd column would be array B.
Thnx in advance
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Go to Solution.

I still couldnt understand how to do it...
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Attachments:
manual_graph.vi ‏643 KB

Copying Multiple Arrays into One Large Array

I'm currently trying to copy multiple character arrays into one larger character array in a method that prints data gathered from a database. Here is my code:
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I keep getting an ArrayIndexOutOfBoundsException and for the life of me I can't figure out why.
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I think your problem lies with the second for loop:
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for(int j = 0; j < data.length; j++) {
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Add text to specified index in multicolumn listbox

Hi!
I have smal problem with multicolumn listbox. My application should
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or more tester at same time.
e.g when user gives for tester 1 values 1 - 5, my vi creates list where values are displayd like this:
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2
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4
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after that user gives for tester 2 values 5-1 and my vi creates list where values are displayd like this:
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hi Janne.
it took me a while to get back
sorry!
good to know u have been able to solve it!
anyhow, do look this vi i have attached. This also takes care of extra elements in the larger array and appends them into the interleaved list box entry.
hope it can be of help to u.
ciao
Devchander
Attachments:
listbox_vi.vi ‏90 KB

How to read 'clicked header' AND selected row from multicolumn listbox?

I have a multicolumn listbox filled with 6 columns and about 500 rows.
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My thanks to you and Jared.
Seems I got a working solution now.
Did take a while to figure out why your solution worked. Basicly, you're reading the row from a few iterations before.
As soon as I understood that, I simplified it a little. Look at the attached file... I think it does the same. :-)
Jared asked for the sorting routine. As I don't seem to be able to attach files when replying to comments, I took the liberty to include it here also.
Basicly, I just use the 'sort 1D array' that comes with Labview 6. To be able to sort a 2D array, I convert every row to a cluster. That's something the 'sort 1D array' VI can handle nicely.
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Attachments:
copy2_of_multicolumn.vi ‏26 KB
sort_2d_string_array.vi ‏34 KB

Is there a way to extract data from one of e.g. 7 rows from the multicolumn listbox?

is there a way to extract data from one of e.g. 7 rows from the multicolumn listbox?

All the data can be extracted by creating a property node and read the Item Names property...then you get a 2D array of all the rows and columns. Wire that array into an index array function and input the row you want (e.g. the listbox value, if you want the row currently selected...)...that's it. See attached example.
MTO
Attachments:
ExtractRow.vi ‏24 KB

How to add rows in the multicolumn listbox

hello all,
the questions are as below:
1. how to add the rows in the multicolumn listbox?
2. the message is RS232 communication message with hex format, how to convert the 2D format to adapt the itemnames property?
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Solved!
Go to Solution.

Hello muks,
I would like to come up with the function like below picture:
the multicolumn listbox include 5 columns, the fifth column is hex format. I want to add the row one by one after each cycle, meanwhile there's a button that can clear the contents in the multicolumn listbox.
So the challenge for me is how to concatenate the different format into one array. then how to insert the row one by one.
Thanks in advance.

Trabajar con Multicolumn Listbox

Hola a todos...mi pregunta es la siguiente:
me encuentro realizando una aplicación donde almaceno en una base de datos el nombre de unas variables (temperaturas), mas no el valor.
en la primera columna muestro los datos de un Select que hago a una tabla donde estan los nombres de las variables (select nombre from tabla), mi pregunta es la sigiuente como puedo colocar en la segunda columna del Multicolumn Listbox el valor de las variables que tengo almacenados en un array que lo capturo en tiempo real.
el Multicolumn Listbox quiero que se me vea así:
Multicolumn Listbox
variable valor
Temp1
60
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80
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gracias...

Hi pineda,
if you have all the names in one array and your temperature values in an other array you can use the "build array" function to get a 2D Array of it. After that you can use a property node of your multicolumn listbox and write the data into it.
Hope it helps.
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Attachments:
Multi_LV80.vi ‏10 KB

Problem with multicolumn listbox

I have a problem in selecting a multicolumn listbox and display it as an individual elements of a selected array. The problem is that whatever I typed in the multicolumn listbox will be disappeared after run. The only solution to get those individual elements is to type those element as in costant of 2D array and connect it to the property node of the multicolumn listbox. But that's not what I want, I want user to be able to select from what displays in the multicolumn list box and then represents each individual element.

The thing to remember is that although a multicolumn list box looks like a string table, it's really a numeric control. To access the strings you have to use the ItemNames property.
Writing to the property (which is 2D array for a multicolumn listbox or 1D or a conventional listbox) displays strings in the box, reading the property would readout anything you might have entered into it.
Mike...
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Certified LabVIEW Architect
LabVIEW Champion
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CSV from Multicolumn Listbox

Currently, I have a User Input Promt delivering values to a Multicolumn Listbox.
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Attachments:
CSV from Multicolumn Listbox.vi ‏64 KB

Which part are you having problems with, since it's not clear:
Accessing the first row - You already have the 2D array in the loop, so not sure why you would want to pull the data from the listbox, as that's been formatted to 2 decimal places, so you'd lose accuracy.
Converting to a comma-delimited string - Use the Array to Spreadsheet String function. See attached pic for example.
Getting notified of this external value - This depends on what's generating this external value. You can use a queue, or a simple global.
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Attachments:
Example_BD.png ‏2 KB

Filling large array into multicolumn listbox

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