Thanks for your answer.
I noticed that if I fill a dataset into the file, than the
H5Fget_filesize function returns the correct size.
For the motivation to use the H5Fget_vfd_handle, I can explain:
I try to somehow serialize a HDF5 file in order to manage multiple
access of relatively small sized files using a relational database,
inserting HDF5 file pieces as binaries (BLOB, byta, etc..). This would
be useful for getting a data access taking advantage of concurrent
access on a relational database (for small to medium file sizes), and
keeping the flexibility of HDF5 format to manipulate data. To simplify,
I would need a function of the type H5Fencode and H5Fdecode !
You seem to have some idea using the CORE VFD. I am curious to
understand more about....
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