Chief Delphi - View Single Post - Prevent code crash when Camera unplugged.

virtuald · #2 11-02-2015, 19:52

Yup. Python allows you to catch exceptions using exception handlers.

Code:

try:
   ... camera initialization code goes here
except:
    self.logger.error("No camera detected")

Or if you want it to crash when you're not at a match -- but not during a match, you can do this instead:

Code:

try:
    ... 
except:
    if not self.isFmsAttached():
        raise

We should probably add a note about this to the documentation, or make sure it doesn't crash.

Similar issues exist if you don't test your code well enough, and it crashes somewhere -- you're done for even on simple syntax errors. For that reason, I've thought about creating a version of iterative robot that would only crash if the robot wasn't connected to the FMS. See https://github.com/robotpy/robotpy-wpilib/issues/96 for my thoughts.