EPICS Home EPICS Controls Argonne National Laboratory

Experimental Physics and
Industrial Control System

Format page
for printing


Search Tech-talk
1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  2012  2013  2014  2015  2016  2017  2018  2019  2020  <2021>  2022  2023  2024  Index 1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  2012  2013  2014  2015  2016  2017  2018  2019  2020  <2021>  2022  2023  2024 
<== Date ==> <== Thread ==>
Subject: Re: Phoebus scripts on Windows
From: "Kasemir, Kay via Tech-talk" <tech-talk at aps.anl.gov>
To: EPICS Tech Talk <tech-talk at aps.anl.gov>, "Smith, William" <william.smith at helmholtz-berlin.de>
Date: Mon, 6 Dec 2021 15:36:04 +0000
Display scripts run inside the display. They use either jython or _javascript_, they're executed by the JVM, and they can access anything that the java code could access.
connect2j was an attempt to support C-python, so you can use packages like numpy. But of course C Python runs as a separate process outside of the JVM, so it cannot access anything that the java code could access. Good for crunching numbers, useless if you want to interact with widgets on the screen. We looked at the py4j package that basically starts a TCP server/client in both the JVM and C python and then communicates between the two so that C python can interact with the display.
That was described in the original display builder online help,

and the referenced connect2j helper is still included in the phoebus version:

In practice, it's been cumbersome and slow, so we don't advertise it any longer.
If your scripts interact with the display, you're better off removing references to connect2j and py4j and just stick to jython (or _javascript_).

-Kay

From: Tech-talk <tech-talk-bounces at aps.anl.gov> on behalf of Smith, William via Tech-talk <tech-talk at aps.anl.gov>
Sent: Monday, December 6, 2021 10:11 AM
To: EPICS Tech Talk <tech-talk at aps.anl.gov>
Subject: [EXTERNAL] Phoebus scripts on Windows
 

Hi,

 

I am trying to run a Phoebus screen that uses a script. The script changes the dimensions of an image widget depending on the size PV of the image.

The screen and script works in a linux environment but not in Windows(10). In the terminal I get the error “cannot locate package connect2j”

 

Do I need in stall a python package, if so which one? A quick search brings up nothing for connect2j.

 

Thanks,

 

Will



Helmholtz-Zentrum Berlin für Materialien und Energie GmbH

Mitglied der Hermann von Helmholtz-Gemeinschaft Deutscher Forschungszentren e.V.

Aufsichtsrat: Vorsitzender Dr. Volkmar Dietz, stv. Vorsitzende Dr. Jutta Koch-Unterseher
Geschäftsführung: Prof. Dr. Jan Lüning (Sprecher), Prof. Dr. Bernd Rech, Thomas Frederking

Sitz Berlin, AG Charlottenburg, 89 HRB 5583

Postadresse:
Hahn-Meitner-Platz 1
14109 Berlin
Deutschland
References:
Phoebus scripts on Windows Smith, William via Tech-talk
Navigate by Date:
Prev: Re: Phoebus scripts on Windows 王一凡 via Tech-talk
Next: Re: CentOS Alternatives Ernesto Paiser via Tech-talk
Index: 1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  2012  2013  2014  2015  2016  2017  2018  2019  2020  <2021>  2022  2023  2024 
Navigate by Thread:
Prev: Re: Phoebus scripts on Windows 王一凡 via Tech-talk
Next: Infinite FLNK loop Daykin, Evan via Tech-talk
Index: 1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  2012  2013  2014  2015  2016  2017  2018  2019  2020  <2021>  2022  2023  2024 
ANJ, 06 Dec 2021 Valid HTML 4.01! · Home · News · About · Base · Modules · Extensions · Distributions · Download ·
· Search · EPICS V4 · IRMIS · Talk · Bugs · Documents · Links · Licensing ·