footbot_encoder can not be reading.

[yunxiaoshan]

Hi, I am trying to add a footbot_encoder sensor on a footbot robot to get the wheel speed. What I do like this: const CCI_DifferentialSteeringSensor::SReading& tEncoderReads = m_pcEncoder->GetReading(); cout << tEncoderReads.VelocityRightWheel <<endl; The build process can work. However, When I launch the simulator, the segmentation fault will happen. I figure out that the error is the cout. When the cout is commented, everything goes well. The first question is am I doing that in the right way? May I have a solution to print the encoder readings? Thank you! -shan

[jharwell]

I think this is better asked in the forums: http://www.argos-sim.info/index.php. Without seeing more of your code, I can only guess that m_pcEncoder is NULL. Did you (a) put the differential steering sensor in the XML, and (b) call GetSensor() as shown in the examples (https://www.argos-sim.info/examples.php)?

[yunxiaoshan]

really appreciate your fast response. I found my problem, as you advice of (b), I forget to get sensor. For the forums, I do not know why it cannot be browsed and shows SQL ERROR [ mysqli ] error. anyway, thank you and I will try to figure out the error.

[ilpincy]

I didn't notice the db error in the forum, thanks for pointing that out! The forum is back in action.