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nexusformat / code

NeXus API code and helper applications
GNU Lesser General Public License v2.1
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NXgetnextattr is deprecated without a replacement #438

Closed peterfpeterson closed 7 years ago

peterfpeterson commented 7 years ago

v4.4 has deprecated NXgetnextattr which is currently the only way to generate a list of attribute names. If NXgetnextattr is removed, then there is no way to loop through all attributes on a group/data. Instead client code will have to guess all possible attributes and see if they exist by checking the return codes on NXgetattr. It looks like you could use (in HDF5) H5Aget_name to expose the names of the attributes for iteration.

zjttoefs commented 7 years ago

What about NXgetnextattra?

From: Pete Peterson notifications@github.com Sent: 6 Oct 2016 7:19 p.m. To: nexusformat/code Subject: [nexusformat/code] NXgetnextattr is deprecated without a replacement (#438)

v4.4 has deprecated NXgetnextattr which is currently the only way to generate a list of attribute names. If NXgetnextattr is removed, then there is no way to loop through all attributes on a group/data. Instead client code will have to guess all possible attributes and see if they exist by checking the return codes on NXgetattr. It looks like you could use (in HDF5) H5Aget_namehttps://support.hdfgroup.org/HDF5/doc/RM/RM_H5A.html#Annot-GetName to expose the names of the attributes for iteration.

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peterfpeterson commented 7 years ago

That works. It would be great if the deprecation message (from the compiler) suggested NXgetnextattra.