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The rosbag C++ API gives you full access to the messages in the bag. You can easily read out a few messages from given topics. Just have a look at the corresponding tutorial.
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The rosbag C++ API gives Did you full access to try the messages in rosbag::View::size method? As I understand it, it should return the bag. You can easily read out a few messages from given topics. Just have a look at the corresponding tutorial.number of messages. Maybe std::distance(view.begin(), view.end()) could also work, but not sure about that.
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