No devices found

[bragostin]

That's an awesome package, thank you for developing it! Unfortunately after many trials I still can't make it work:

Debian 12
python 3.11.2 (main, Aug 26 2024, 07:20:54) [GCC 12.2.0]
nidaqmx                  1.0.1
numpy                    1.24.2

cat /run/nidevldu.status yields:

2 Device(s) Found:

Device 1
Device Type: cDAQ-9174
Device Identifier: cDAQ1
Device GUID: 2d20ec26-861f-11ef-80ca-3ce1a1512ad8
Device Driver Type: MXDF
iDriver Class Name: nNICSR100::tMarlinDriver
iDriverInitializer Class Name: nNICSR100::tCDAQChassisDriverInitializer
iDriverClient Class Name: nNICSR100::tCDAQChassisDriverClient
iDriverFinalizer Class Name: nNICSR100::tCDAQChassisDriverFinalizer
tDriverBroker::createDriver status: 0
post createDriver status: 0
Device Init time: 599 ms
Device Batch Number: 2

Device 2
Device Type: NI 9264
Device Identifier: cDAQ1Mod4
Device GUID: 33a19a73-861f-11ef-80ca-3ce1a1512ad8
Device Driver Type: MXDF
iDriver Class Name: nNICSR100::tCDAQCartridgeDriver
iDriverInitializer Class Name: nNICSR100::tCDAQCartridgeDriverInitializer
iDriverClient Class Name: nNICSR100::tCDAQCartridgeDriverClient
iDriverFinalizer Class Name: 
tDriverBroker::createDriver status: 0
post createDriver status: 0
Device Init time: 561 ms
Device Batch Number: 3

It seems the device is there and recognized by the nidaqmx driver.
However, [dev.name for dev in nidaqmx.system.System.local().devices] yields:

raceback (most recent call last):
  File "/home/chbrago/Documents/Labs/NI/Python/test.py", line 11, in <module>
    devices = [dev.name for dev in nidaqmx.system.System.local().devices]
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/chbrago/Documents/Labs/NI/Python/test.py", line 11, in <listcomp>
    devices = [dev.name for dev in nidaqmx.system.System.local().devices]
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/chbrago/cadquery/lib/python3.11/site-packages/nidaqmx/system/_collections/device_collection.py", line 71, in __iter__
    for device_name in self.device_names:
                       ^^^^^^^^^^^^^^^^^
  File "/home/chbrago/cadquery/lib/python3.11/site-packages/nidaqmx/system/_collections/device_collection.py", line 93, in device_names
    val = self._interpreter.get_system_info_attribute_string(0x193b)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/chbrago/cadquery/lib/python3.11/site-packages/nidaqmx/_library_interpreter.py", line 3455, in get_system_info_attribute_string
    return value.value.decode(lib_importer.encoding)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: decode() argument 'encoding' must be str, not None

Any idea?

[zhindes]

We get the encoding here. That uses locale.getlocale().

Can you open an interactive python prompt (just run python as is) and do this?

$ import locale
$ print(locale.getlocale())

[bkeryan]

@zhindes This was also reported internally as AB#2827586. locale.getlocale() can return an encoding of None, so we ought to update nidaqmx-python to fall back to ASCII when the encoding is None.

[zhindes]

@bkeryan - Ah nice, I'll try to find time this week to make a PR to address that!

@bragostin - Try setting your language environment variables as specified in the locale man page.

[bragostin]

@zhindes print(locale.getlocale()) yields (None, None)
Doing

export LC_ALL="en_US.UTF-8"
export LC_CTYPE="en_US.UTF-8"

actually solved the issue, Now [dev.name for dev in nidaqmx.system.System.local().devices] yields ['cDAQ1', 'cDAQ1Mod4']