AW: About live streaming data plot

[Huber, Jörg]

Hi Barth, Hi James,
I’m using Kst (Windows Version Kst-2.0.8 Revision 29f1416) to plot live streaming data.
A Windows data logger program reads data from PLC’s (~ 200-300 data points = columns) and writes a new dataset to a CSV file each 1000ms –even 100ms will work.
At the same time Kst Plot reads from this file without any problems.
I had the same problem when the CSV file writer from the datalogger program was not closed after each dataset. I guess this is your problem!

See attached screenshot of 30 days data plot with Kst.
A new CSV file is generated every day, so even a period of several days can be displayed!
So you are right - Kst is a wonderful tool.

Best regards
Joerg


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Von: Kst <kst-bounces at kde.org> Im Auftrag von Barth Netterfield
Gesendet: Montag, 16. Juli 2018 15:07
An: kst at kde.org; JAMES WATT <jmsnwtt at gmail.com>
Betreff: Re: About live streaming data plot


Hmmm...

This sounds like  Windows race condition.

Alas, I only use Linux, so have no idea how to fix this.  :-(  I do know that people have successfully used kst real time in windows though.

Does anyone else on the list have any suggestions?

cbn

On 2018-07-15 11:02 PM, JAMES WATT wrote:
Hello Kst experts,
Kst is a such a wonderful tool for plotting live streaming data.
It just works.
I can validate it by opening a .txt data file by Notepad and change it on the fly and see the change is reflected within Kst.
However, I have another application that generates to streaming data and export it to a .txt file in real time.
Once I open Kst and set this file as the data source, the application prompts  'Could not write to file.(Cannot open file...The process cannot access the file because it is being used by another process.)'
My question is why is Kst compatible with the plain Notepade.exe but not to the other application?
If Kst only reads to a .txt file, can I set it to a more "recessive" mode so that the other application won't deem it as a writing race condition risk.
Thank you for any comments.



--

C. Barth Netterfield

416-845-0946
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