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Subject: | Can't import PyEpics on CentOS 7 |
From: | Chiang, Liang-Chih [江良志] via Tech-talk <[email protected]> |
To: | "[email protected]" <[email protected]> |
Date: | Thu, 9 Jan 2020 03:29:31 +0000 |
Hi,
I could install PyEpics on CentOS 6.10(x86_64) and Python 3.7, and there is no problem using caget, caput, PV, Motor, etc.. of PyEpics.
However, in the following environment, 'import epics' will result in error. CentOS version 7.4, x86_64 architecture Linux kernel version 3.10.0 Python 3.7 (created by Miniconda virtual environment)
The PyEpics was installed by the following command: $ conda install -c GSECARS pyepics
In Python interactive shell: >>> import epics Traceback (most recent call last):
File "/home/user/miniconda3/envs/py37/lib/python3.7/ctypes/__init__.py", line 97, in CFUNCTYPE
return _c_functype_cache[(restype, argtypes, flags)]
KeyError: (None, (<class 'epics.dbr.access_rights_handler_args'>,), 1)
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/home/user/miniconda3/envs/py37/lib/python3.7/site-packages/epics/__init__.py", line 29, in <module>
from . import ca
File "/home/user/miniconda3/envs/py37/lib/python3.7/site-packages/epics/ca.py", line 761, in <module>
dbr.access_rights_handler_args)
File "/home/user/miniconda3/envs/py37/lib/python3.7/site-packages/epics/dbr.py", line 339, in make_callback
return ctypes.CFUNCTYPE(None, args)(func)
File "/home/user/miniconda3/envs/py37/lib/python3.7/ctypes/__init__.py", line 99, in CFUNCTYPE
class CFunctionType(_CFuncPtr):
TypeError: item 1 in _argtypes_ passes a struct/union with a bitfield by value, which is unsupported.
I also tried installing PyEpics by 'pip install pyepics', similar error message will show up when installing.
Best regards.
LiangChih Chiang email: [email protected] Beamline Group National Synchrotron Radiation Research Center (NSRRC) |