Fixed pcan Unpack error #1767
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Fixed pcan Unpack error #1767
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PCANBasic.GetValue() must always return a Tuple with 2 elements, otherwise PcanBus._detect_available_configs() raises a "not enough values to unpack" error at line 718.
zariiii9003
reviewed
Apr 23, 2024
| @@ -967,7 +967,7 @@ def GetValue(self, Channel, Parameter): | |||
| elif Parameter == PCAN_ATTACHED_CHANNELS: | |||
| res = self.GetValue(Channel, PCAN_ATTACHED_CHANNELS_COUNT) | |||
| if TPCANStatus(res[0]) != PCAN_ERROR_OK: | |||
| return (TPCANStatus(res[0]),) | |||
| return TPCANStatus(res[0]), () | |||
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| return TPCANStatus(res[0]), () | |
| return TPCANStatus(res[0]), None |
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Since you expect to receive an Iterable, returning an empty tuple is better so you don't have to check if it is "None" before using it in a For loop.
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This is the error case. There is no valid result, so it is not used here:
python-can/can/interfaces/pcan/pcan.py
Line 720 in 7dba449
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One of my colleagues encountered a "not enough values to unpack" error while scanning for connected dongles with PCAN drivers installed.
I couldn't replicate the error on my computer after installing the latest PCAN drivers. Still, analysing the instruction that raised that error, it seems that
PCANBasic.GetValue()returned a wrong Tuple for a specific error condition.That method must always return a Tuple with 2 elements, otherwise
PcanBus._detect_available_configs()raises a "not enough values to unpack" error at line 718.