Updating a control array

Thats all great guys! Thanks a lot....
Just one last question... is it possible to update values held in a control
array whilst a program is executing (other than manually!!), by loading them
from a spreadsheet file?
Cheers for any advice (As you see, I'm quite new to all this!)
"Randy H" wrote in message
news:[email protected]..
> John,
>
> Sure. If the reading of the file is the first thing done in your
> program, then this will be an easy task. That is how LabVIEW loads. It
> stores a bunch of options in the LabVIEW.ini file. When LabVIEW first
> launches, it parses this file ans starts LabVIEW with the correct
> options. You would be doing something very similar.
> Also, the way you are
aproaching this is exactly what you would need
> to do if you build your VI into an executable. See
>
href="http://pong.ni.com/public.nsf/websearch/BCFF7D3335E256E286256509006772
3D?OpenDocument">this
> as an example.
>
> Randy Hsokin
> Applications Engineer
> National Instruments
> http://www.ni.com/ask

Yes you can. There's a couple of routes you can go.
1) LabVIEW has the function Read From Spreadsheet File in the File I/O palette. This will import a spreadsheet saved as comma or tab separated text data (not native Excel).
2) Use ActiveX to read an Excel file. There's a shipping example called Write Table to XL that demonstratesm how to write to rows and columns. I've attached an example that reads a single cell. It's an example that I downloaded from somewhere I don't remember. Search the forum for other examples.
3) Treat the spreadsheet as a database and use either NI database connectivity toolkit or LabSQL (http://jeffreytravis.com) to run SQL queries on it.
Once you've read the data, it's then a matter of copying to the control by means of
a local variable or property node.

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Hi S.P Singh,
Welcome to MSDN.
I am afraid that as Renee Culver said, these forums donot support VB6, you could refer to this thread:
Where to post your VB 6 questions
You could consider posting this issue in these forums below:
These forums do not support Visual Basic 6, however there are many third-party support sites that do. If you have a VB6-related question please visit these popular forums:
VB Forums
VB City
Thanks for your understanding.
Best Regards,
Youjun Tang
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Control array of callback functions?

Apologies for my basic question.
I am experimenting with control arrays and so far am able to collect data in string controls that are inside control arrays. Works well. Naturally, none of these controls need callback functions.
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Go to Solution.

Yes, callbackData can be of help in such a situation, but if you can limit to switch on array index to discriminate what to do your button callback could be something on this line:
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I am using LabWindows CVI 10.0. My intention is to programmatically disable a control array in a panel.
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Go to Solution.
Attachments:
Error.PNG ‏7 KB

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How many ways can I update a control programmatically???

1. local (or global) variables
2. property nodes.
3.
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Attachments:
Controls Property example.JPG ‏77 KB

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Hello,
I would like to query the Oracle community about an item
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I found after testing that your response is correct.
The database does not consider '0 rows updated' a true error condition, therefore sqlerrd[2] reports the number of rows that WERE updated,NOT the array offset of the row that did not get updated.
Furthermore, through extensive testing, I have found that the behavior I was told to expect by Oracle is NOT how Oracle behaves. Specially, if I have 5 array items, and item 3 does not result in an update, sqlerrd[2] reports 4 - meaning 4 rows updated, not 2, meaning that the third array item failed to result in an update.
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I see I didn't cut and paste in that last post very well. But I'm revisiting this issue and I'm still stuck!
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That's Great!
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How to adjust a "control array" size

I have a program that creates a digital PWM signal with variable duty cycle. The duty cycle changes every 50 ms, but the overall wave frequency stays at a frequency determined by the user. I have the VI attatched.
My problem is this...I need to be able to control the overall cycle time. This means the size of my array of duty cycles needs to adjust based on the cycle time (i.e. a cycle time of 1 second would require 20 of the 50 ms slots, while a 1.3 second cycle would need 26).
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Solved!
Go to Solution.
Attachments:
var_duty_cycle.vi ‏25 KB

Currently, your VI is a one-shot deal. What you need is a state machine that updates the pct duty cycle array control as a function of the frequency while the current I/O code is idle.
I would use an array of clusters, where each cluster contains e.g. a sequence number, a duty cycle, and a string as element label. Show the scrollbar and set the size whenever the relevant inputs change. Do you want to reset the current setting when the number changes or do you want to retain the current settings as much as possible? You could just use the existing values, reshape to the larger or smaller size, and write it back to the control via a local variable. Set all elements except the percent to disabled so they act as indicators and cannot be changed by the user.
(You also need to program around it if the operator tries to manually add more elements. A better solution would be this idea, so vote for it .)
Some more general comments bout your code:
Why do you use extended precision floating point. All your waits are internally just integers. EXT makes no sense
There is a primitive for 1/x. However, you could just do a 1000/x and eliminate the multiplication afterwards. SInce you are dealing with integers, you can even do the division using quotient&remainder. Depending on the allowed frequency range there are possibly no orange data needed at all.
Make the diagram constant representation match the rest of the code.
The pulses/50ms indicator belongs before the loop. No need to recalculate and refresh it over and over from the same input values.
LabVIEW Champion . Do more with less code and in less time .

Updating a control array

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