我有从串口读取数据的代码。
try:
dataIn = self.port.read(100)
except serial.SerialException:
#do some work
return None
如果我断开设备连接，我会捕获我无法处理的异常。
Traceback (most recent call last):
File "/usr/local/lib/python3.4/dist-packages/serial/serialposix.py", line 475, in read
raise SerialException('device reports readiness to read but returned no data (device disconnected or multiple access on port?)')
serial.serialutil.SerialException: device reports readiness to read but returned no data (device disconnected or multiple access on port?)
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/home/katkov/work/obd2rds/obd2rds/testing/python/main.py", line 48, in <module>
main()
File "/home/katkov/work/obd2rds/obd2rds/testing/python/main.py", line 41, in main
dataIn = serPort.read()
File "/home/katkov/work/obd2rds/obd2rds/testing/python/uart.py", line 55, in read
dataIn = self.port.read(100)
File "/usr/local/lib/python3.4/dist-packages/serial/serialposix.py", line 480, in read
if e[0] != errno.EAGAIN:
TypeError: 'SerialException' object does not support indexing
我怎样才能捕获它被正确处理的异常。
谢谢！
感谢乔纳森·尤尼斯 https://stackoverflow.com/users/240490/jonathan-eunice！你的建议解决了我的问题。
现在我使用以下代码：
try:
dataIn = self.port.read()
except serial.SerialException as e:
#There is no new data from serial port
return None
except TypeError as e:
#Disconnect of USB->UART occured
self.port.close()
return None
else:
#Some data was received
return dataIn
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