About live streaming data plot

[Steve Maher]

Hi,

I suspect Notepad reads the entire file and then closes the file, let's you
view/edit, and then. when you write it also closes after the write.  By the
time KST sees the change, Notepad does not have a file handle open to the
file.

Having said that, I use KST on windows - writing both .txt files and
dirfiles from a custom (Java) application.  The application keeps the
dirfile file handles open continuously and that kst plugin has no problem
reading updates.  Perhaps the KST .txt reader is a little more finicky.
Our .txt writer opens, writes, and closes the .txt file for each (1 Hz)
update so again, KST is probably the only file user when it retrieves
updates to the .txt file.  I suggest you change your .txt writer to
open/write/close for each update.

Steve


On Mon, Jul 16, 2018 at 9:06 AM Barth Netterfield <
barth.netterfield at gmail.com> wrote:

> 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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