Minimal example to read and dissect pcapng file

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The epan lib is an integral part of Wireshark and has not been built for use by other applications and the ABI changes each major release.

If you do want to use the lib in another application there is no documentation or guidance apart from the existing Wireshark documentation and code. There have been reported attempts to use it in an application but probably due to the licence (GPL2.0) they are likely to have not been distributed.