How to visualize/read string messages from Rosbag

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Note also that what you're running into is a result of the (mis)use of messages and the reason that using semantically meaningful and appropriate messages is always strongly encouraged.

Thanks for the explanation. I thought the same as well.

Then how can i atleast read this data ? one way is definitely to convert it into a csv file. I tried the following :rostopic echo -b file.bag -p /topic > data.txt but it gives a UnicodeDecodeError. Any idea ?

I'm not sure how well supported unicode/utf-8 is right now. If you have used characters from extended character sets this might cause problems.

It shouldn't though, so if you can create an MWE, you should report it.

Yes, i guess there are some chinese characters in it but i am not sure.

• How can i check the contents of this bag file ?
• If you look at the image above, the bagfile has a topic called /perception/kouliang and the message type is sim_l3_msg/kouliang. I do not actually know what is it ?

re: get at the contents of the bag: if you play the bag, can you rostopic echo .. the topics in question?

re: msg type: you would have to ask your colleague. That is a custom message, so he should know.