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.
Necessary data from this multicolumn listbox to write the file (preferably ini). Then, the recorded data is read from a file in a multicolumn listbox.
Solved!
Go to Solution.

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

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Write multicolumn listbox value from subvi whitout reference

Hi:
Is it anyway to write data to multicolumn list box from subVI without pass in reference? Because if pass in reference I have to pass a lot.
Like I can use Open VI Reference together with "Set Control Value" to set a String indicator text. But I can't find the way to use open vi reference to set the multicolumn listbox text, I only can highlist which row.
Thank.

One thing you could do:
Write the multicolumn listbox reference to an indicator in your main VI. In the SubVI read that indicator value and unflatten it into a multicolumn listbox reference. Then you'll have the reference available in the SubVI as if you had passed it.

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

I have a multicolumn listbox filled with 6 columns and about 500 rows.
I want the user to be able to click on a column header, and sort the listbox alphabetically on that column. I've written the code for that, and that works. (using the 'itemnames' en 'get clicked col hdr' properties.)
However, I also want to include the option, that when a user highlights a row, and then clicks on the header, that after the listbox gets sorted it scrolls down to the selected row.
(So that the user doesn't have to search for it)
And that's where things go wrong, because the value of the listbox changes to zero when you click on a column header. No I idea why it does that, but it's rather
annoying. Can I change that behaviour somehow?
Or any ideas how to get around it?

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.
To sort on the correct column, I just cut all columns in front, and paste them behind again. A
fter sorting, I reverse the process.
Anthony.
Attachments:
copy2_of_multicolumn.vi ‏26 KB
sort_2d_string_array.vi ‏34 KB

I have a vi that reading data and put it in a multicolumn listbox one by one, I want to know how can I do it if i will use MS powerpoint instead of multicolumn listbox.

i want the data to be transfered in MS Powerpoint like what multicolumn listbox act in my vi.
(would you mind if i will ask for an example)
Thank You

Good morning:
I think you might have an easier time doing this with a Powerpoint macro than with Activex. You can save your data to a spreadsheet file, and then let the PPT macro read that file and format it the way you like. You will have to have two programs operating simultaneously, but that shouldn't be a problem.
Eric
Eric P. Nichols
P.O. Box 56235
North Pole, AK 99705

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.
Ian

Read data in the first column selected in a Multicolumn listbox

When a row is selected in a multicolumn listbox (1 item), how do I go about reading the data in the first column?
Solved!
Go to Solution.

The multicolumn listbox itself is numeric array data type. If you have allowed selection of only 1 item and selection mode of select entire row, it returns the row number. Use the "Item Names" property node to return a 2d array of strings of the items in your box. Index it by the row from the value of the listbox and column 0. See attached code.
Charles Chickering
Architecture is art with rules.
...and the rules are more like guidelines
Attachments:
MultiColumnListbox.vi ‏5 KB

Adding a single line to a multicolumn listbox?

Hi Community,
I have a multicolumn listbox which tens of thousands of lines where each line is color coded and represent a cycle with a pass/fail status. The only way I have found to add lines to a multicolumn listbox is to read its ItemNames property which is a 2D array of strings, add the new line to the 2D array and then write then new array back to the ItemNames property.
The problem is that after couple thousands of lines this get more and more slow.
Is there any way to speed this process up, maybe by adding the line to the listbox in a different way?
thx.

The Listbox, and Multicolumn listbox controls got many UI performance improvements in 2013, what version are you using?
https://lavag.org/topic/17009-labview-2013-favorite-features-and-improvements/
But even if you are on an old version there are many tricks to making the UI more responsive, like using defer panel updates, and virtual multicolumn listboxes.
https://lavag.org/topic/15289-virtual-multicolumn-listbox/
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.

Inserting an image in a column of a multicolumn listbox

Hi,
How can I insert an image in a column and row of a multicolumn listbox? Is it possible?
Thanks,
ToNi.

To change any property of a cell, you must first select it using the Active Cell Property node, a cluster of row and column indexes. Setting the indexes values to -2 select the entire row/column/table, including the headers, setting the indexes to -1 select only the headers.
Changing a column foreground color without affecting the header color is therefore a 3 steps operation :
- set the active cell property to -1, n (n being he column index); read the foreground color
- set the active cell property to -2, n; write the new foreground color
- set the active cell property to -1; write back the previously read foreground color
Since you cannot change programmatically the images in a ring, the pict ring array cannot be used if you want to load new images at run time.
Use instead a picture array, as shown in the attached vi. I still use a pict ring, but that's just as a convenient image source. Replace it with your own source (file dialog for instance...)
CC
Chilly Charly (aka CC)
E-List Master - Kudos glutton - Press the yellow button on the left...
Attachments:
ListBox & Picts.vi ‏1 KB

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.
Please, can someone here help me?

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

Problem with Multicolumn Listbox Scrolling

Hello...
Can anybody please tell me how to scroll according to row no. in multicolumn listbox?
I'm working on a VI where I have to test some conditions which are depending upon RPMs... For testing ease I have sorted the conditions according to the similar RPM... But the conditions are scattered in the multicolumn listbox ie they are not in sequence... Suppose the conditions are on row no. 1, 7,15,38,56,82,100,139,180 something like that....
Is it possible to scroll down according to row no. While running the VI...? So that the viewer can see which condition is in progress & it's results...
Thanks in advance for any help...

I have seen a property in a scrollbar that limits the scrolling range to it's maximum.
I'm not sure the same property is available in 7.1.
You might need to remove the listbox's own scrollbar and use a seperate one.
Ton
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Help - Edit cell of a multicolumn listbox at run time

Hi All,
I am populating rows and columns of a multicolumn listbox from a file at run time. However, after the data is loaded in the listbox I want to have the option of changing cell value.
Can I do that? If so, how?
I appreciate your time and help.
Thanks,
Mim

Hi,
You have to use the property item names witch is a 2D string array.
Then replace the elements you want to change in that array and write it back to the table.
Check attachment.
Hope it helps,
Paulo
Attachments:
ChangeTableElements.vi ‏20 KB

Editing entries in multicolumn listbox

I am using a multicolumn listbox to display test parameters - ie columns of step number, temperature and time data. I read a previously created test matrix and update the listbox items names using the property node.
Is it possible to do the reverse - ie edit the item names while the app is running and save a new test matrix from the modified listbox?
Thanks,
Niel.

It seems impossible to edit list in the running time. However, could you try to use string table to do that?

How do you autosize column widths in a multicolumn listbox?

I know that it's possible to autosize row height, but I can't find anything relating to autosizing column widths in a multicolumn listbox. This makes what I'm doing difficult, because I want to be able to have dynamic content and won't know beforehand how wide to make the columns. Therefore, I need to do it programatically or find something already built in.
Thanks for your help!

I did an example along the lines of the suggestions above and it works pretty well. I'll attach it here. Note that this only works for 13pt font. If you want to scale this example to include larger font, then you can get that information from the cell height property, which does autoscale by default. The cell height is usually about 2 larger than the font size (i.e. 13pt font = 15 cell height, 24 pt font = 26 height).
This example is written in LV7.0. What would really be cool is if someone would write an XControl for LV8 that would do all this automatically and require no extra block diagram code! If only I had the time...
Jarrod S.
National Instruments
Attachments:
Autosize_Columns.vi ‏30 KB

Multicolumn Listbox not more than 32 Symbols?

I have a Multicolumn Listbox. In the first row, I have a symbol (the diamond). Configuration of the Listbox is done via the frontpanel editor. Data is inserted programmatically, as well as the size, visibility and colors of the symbols are set programmatically. Basically, everything works fine. BUT when I insert more than 32 rows into the Listbox, there are no symbols on rows 32+.
I did not find any signs that the number of rows or number of symbols is set to 32 anywhere in the code or on the frontpanel editor.
What could be the reason for this strange behavior?

mibeer wrote:
So the strang behaviour could probably be reproduced by just adding programmatically a random number of entries to a multicolumn listbox upon click of a button.
Well, guessing does not really belong here.
If you suspect a LabVIEW bug, wire up a small example that demonstrates the problem and we can immediately eliminate the "probably" and get a definite answer instead. We like facts better!
Please do so! Thanks.
LabVIEW Champion . Do more with less code and in less time .

Disable horizontal scroll in multicolumn listbox

I'm using a Multicolumn listbox and I programmatically change the cell to be edited using UP, DOWN, RIGHT and LEFT keyboard keys.
Everything is working exept for the rightmost column: when I press the RIGHT key, the cursor moves to the next cell inside the rightmost column but all the table scrolls to the right (even if not really necessary) preventing the user from seeing the first column (leftmost). Is it possible in some way to lock or totally disable the horizontal scroll?
Every idea would be welcome.

I don't think there's a way to completely disable scrolling (once you ask the MCLB to show you a cell, it will probably do whatever it can to show it to you), but you can start by making the scrollbar invisible and by setting the Top Left Visible Cell property to [X, 0] every time you move a cell. If this doesn't work, you should upload your code. We play better when we have what to work with.
Try to take over the world!

Read write multicolumn listbox

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