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clade / PyDAQmx

Interface to National Instrument NIDAQmx driver
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Issues using PyDAQmx 1.3.2 with 64bit Python 3.6.3 on Centos 7 #49

Closed deveshks closed 6 years ago

deveshks commented 7 years ago

Hi,

I tried installing PyDAQmx 1.3.2 on my Centos 7.4.1708 running on an 64bit Intel mini-PC. I am using NI-DAQmx Base 15.0 for Linux, and I am running a 64-bit Python 3.6.3. I am able to successfully install PyDAQmx using pip, but I get the following error when I import it.

Python 3.6.3 (default, Oct 11 2017, 18:17:37) [GCC 4.8.5 20150623 (Red Hat 4.8.5-16)] on linux Type "help", "copyright", "credits" or "license" for more information.

import PyDAQmx Traceback (most recent call last): File "", line 1, in File "/home/tesla/.local/lib/python3.6/site-packages/PyDAQmx/init.py", line 7, in from .DAQmxFunctions import * File "/home/tesla/.local/lib/python3.6/site-packages/PyDAQmx/DAQmxFunctions.py", line 86, in DAQlib, DAQlib_variadic = DAQmxConfig.get_lib() File "/home/tesla/.local/lib/python3.6/site-packages/PyDAQmx/DAQmxConfig.py", line 62, in get_lib ctypes.CDLL('/usr/local/lib/liblvrtdark.so', mode=ctypes.RTLD_GLOBAL) File "/usr/lib64/python3.6/ctypes/init.py", line 343, in init self._handle = _dlopen(self._name, mode) OSError: /usr/local/lib/liblvrtdark.so: wrong ELF class: ELFCLASS32

Has this problem been seen before, and if yes, is there a way to resolve this.

Best, Devesh

deveshks commented 7 years ago

I was able to rectify this issue by replacing line #62 in https://github.com/clade/PyDAQmx/blob/master/PyDAQmx/DAQmxConfig.py

from ctypes.CDLL('/usr/local/lib/liblvrtdark.so', mode=ctypes.RTLD_GLOBAL) to ctypes.CDLL(find_library('lvrtdark'), mode=ctypes.RTLD_GLOBAL)

I also verified this by running the last example on https://pythonhosted.org/PyDAQmx/usage.html using a USB-6210 NI DAQ. Let me know if you want me to make those changes in the library.

Best, Devesh

clade commented 6 years ago

Thanks for your fix : commit 6f8d3a0