How can I write a struct data into h5 file?

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Xiao Jin
Xiao Jin 2019-12-13
回答： Isaac Li 2022-2-9
Hello everyone,
I have opened a .h5 file with MATLAB and want to change a dataset, which datatype ist H5T_COMPOUND (struct). I have written a new struct data (same struct, just one field's value changed), do you know how to write it into h5 file? Thank you!
Best Regards
Xiao

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回答（4 个）

Isaac Li
Isaac Li 2022-2-9
I adapted the code from https://support.hdfgroup.org/HDF5/examples/api18-m.html and created a file exchange function struct2hdf5 for everyone to use: https://www.mathworks.com/matlabcentral/fileexchange/106470-struct2hdf5
Sahithi Kanumarlapudi
‘hdf5write' can be used to write data to a file in ‘.h5’ format.
For more information on how to use ‘hdf5write’ refer to the following link
https://www.mathworks.com/help/matlab/ref/hdf5write.html
per isakson
per isakson 2019-12-20
编辑：per isakson 2019-12-21
If the Matlab support of HDF5 has not been updated in the most recent years there is no high level support for writing compound data to h5-files.
I found only this in the File Exchange Edit_struct_hdf5 by Renato Medeiros. It might be useful to you.
It can be done with the low level HFD5 functions, but I find it a bit tricky, YMMV. Did you study the low level Matlab samples at https://support.hdfgroup.org/HDF5/examples/api18-m.html, especially
  • Read / Write Compound Datatypes (Dataset) h5ex_t_cmpd.m and
  • Read / Write Compound Datatypes (Attribute) h5ex_t_cmpdatt.m
Xiao Jin
Xiao Jin 2020-1-16
I solved the problem. Thanks for you help!

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