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I am not able to read data from the ROS file

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Preeti Sar
Preeti Sar 2015-12-18
回答： Tohru Kikawada 2019-5-2
msgs = readMessages(bag)
Error using robotics.ros.BagSelection/deserializeMessages (line 444)
Java exception occurred:
org.ros.exception.RosMessageRuntimeException: java.lang.ClassNotFoundException: rt_msgs.Odom
at org.ros.internal.message.definition.MessageDefinitionReflectionProvider.get(MessageDefinitionReflectionProvider.java:66)
at org.ros.internal.message.DefaultMessageFactory.newFromType(DefaultMessageFactory.java:42)
at org.ros.internal.message.DefaultMessageDeserializer.deserialize(DefaultMessageDeserializer.java:42)
Caused by: java.lang.ClassNotFoundException: rt_msgs.Odom
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at org.ros.internal.message.definition.MessageDefinitionReflectionProvider.get(MessageDefinitionReflectionProvider.java:62)
... 2 more
Error in robotics.ros.BagSelection/readMessages (line 194)
msgs = obj.deserializeMessages(obj.MessageList, rows);
  2 个评论
Image Analyst
Image Analyst 2015-12-18
Personally, I'd call the Mathworks technical support for any Java related errors. Make sure you have the latest Java release - or maybe not - that might be the problem. Who knows?
Ahmad Drak
Ahmad Drak 2016-4-25
Did you by any chance find a solution to this problem?

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回答（1 个）

Tohru Kikawada
Tohru Kikawada 2019-5-2
You'll need to install custom ROS messages for rt_msgs.Odom. See the following link for details: https://jp.mathworks.com/matlabcentral/answers/329662-unable-to-access-rosbag-topics#answer_259060

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