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Subject: Callback error from pyepics and python with GUI development
From: Tong Zhang via Tech-talk <tech-talk@aps.anl.gov>
To: <newville@cars.uchicago.edu>
Cc: "Chabot, Daron" <chabot@frib.msu.edu>, "'tech-talk@aps.anl.gov'" <tech-talk@aps.anl.gov>
Date: Thu, 11 Apr 2019 18:52:26 -0400
Hi Matt,

I think the following issue I encountered may have something to do with pyepics, which after discussing with Daron, still cannot be resolved yet.

I'm trying to create pv callbacks onto my high-level GUI application with pyepics, but the app crashed because of the error regarding the CA context, please see the attached screenshot. And the strange thing is this only happened to Python 3.5, not Python 3.6 and Python 3.7.

To my understanding, the GUI case is slightly different than python thread, the main thread is for UI rendering, all my created callback are spawned from this main thread, I can do other CA action (put/get) without any problem, so where is the default CA context in the GUI case?

I've checked this link https://github.com/pyepics/pyepics/issues/68#issuecomment-290892241 and the guideline for python thread with pyepics, but still not sure how can I make use of the context.

Appreciate for any reply,
Tong

Attachment: Selection_163.png
Description: PNG image


Replies:
Re: Callback error from pyepics and python with GUI development Matt Newville via Tech-talk

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