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pyvisa / pyvisa-py

A pure python PyVISA backend
https://pyvisa-py.readthedocs.io
MIT License
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list_resources() raises usb.core.USBError when Labjack T7 is connected to USB hub #369

Closed wallacbe closed 1 year ago

wallacbe commented 1 year ago

Bus 001 Device 021: ID 0cd5:0007 LabJack Corporation LabJack T7

File "/venv/lib/python3.9/site-packages/pyvisa/highlevel.py", line 3129, in list_resources return self.visalib.list_resources(self.session, query) File "/venv/lib/python3.9/site-packages/pyvisa_py/highlevel.py", line 486, in list_resources resources += st.list_resources() File "/venv/lib/python3.9/site-packages/pyvisa_py/usb.py", line 317, in list_resources serial = dev.serial_number File "/venv/lib/python3.9/site-packages/usb/core.py", line 864, in serial_number self._serial_number = util.get_string(self, self.iSerialNumber) File "/venv/lib/python3.9/site-packages/usb/util.py", line 317, in get_string buf = get_descriptor( File "/venv/lib/python3.9/site-packages/usb/control.py", line 172, in get_descriptor desc = dev.ctrl_transfer( File "/venv/lib/python3.9/site-packages/usb/core.py", line 1082, in ctrl_transfer ret = self._ctx.backend.ctrl_transfer( File "/venv/lib/python3.9/site-packages/usb/backend/libusb1.py", line 893, in ctrl_transfer ret = _check(self.lib.libusb_control_transfer( File "/venv/lib/python3.9/site-packages/usb/backend/libusb1.py", line 604, in _check raise USBError(_strerror(ret), ret, _libusb_errno[ret]) usb.core.USBError: [Errno 32] Pipe error

Solution: Add usb.core.USBError to try/catch block https://github.com/pyvisa/pyvisa-py/blob/main/pyvisa_py/usb.py#L318

MatthieuDartiailh commented 1 year ago

Duplicate of #363 whose author will open a PR.

wallacbe commented 1 year ago

Is there a process to request pypi release?

MatthieuDartiailh commented 1 year ago

I will try to do one by the end of the May. Feel free to ping me if you do not see anything coming.