Hi, Andrej As a start you can use my HDF5 delphi headers and some function conversion on the page http://www.astro.ff.vu.lt/index.php?option=com_content&task=view&id=46&Itemi d=62
I think it will save you time. I think your problem is already discussed in: http://hdf-forum.184993.n3.nabble.com/Freeing-returned-strings-tt4026607.htm l#none Regards, Saulius -----Original Message----- From: Hdf-forum [mailto:[email protected]] On Behalf Of ?????? ????????? Sent: Monday, February 24, 2014 3:06 PM To: [email protected] Subject: [Hdf-forum] Freeing memory claimed by H5Aread Hello! I'm writing an interface for HDF5 library for Delphi. So far I imported most of the library procedures; I can now successfully browse HDF5 files (query groups/datasets/attributes) and read data. However I'm facing a problem regarding variable-length string attributes. When reading such attribute, HDF5 library does the memory allocation; but I couldn't find a documented way to properly free the memory. h5dump returns the following for the attribute: ATTRIBUTE "description" { DATATYPE H5T_STRING { STRSIZE H5T_VARIABLE; STRPAD H5T_STR_NULLTERM; CSET H5T_CSET_ASCII; CTYPE H5T_C_S1; } I'm now using the following code, and it seems to do the job. But using H5Dvlen_reclaim for attribute data isn't probably correct (as H5D prefix suggests). var Attribute: IHDF5Attribute; MemType: IHDF5Type; Data: Pointer; begin Attribute := GetAttribute(AObj, AName); MemType := THDF5Type.Create( Dll.H5Tcopy(Dll.H5T_C_S1), Dll.H5Tclose); Dll.H5Tset_size(MemType.ID, H5T_VARIABLE); Dll.H5Aread(Attribute.ID, MemType.ID, @Data); try // use Data finally Dll.H5Dvlen_reclaim(GetType(Attribute).ID, GetSpace(Attribute).ID, H5P_DEFAULT, @Data); end; end; What is the proper way to free the memory allocated by H5Aread for variable-length data? Best wishes, Andrey Paramonov -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. _______________________________________________ Hdf-forum is for HDF software users discussion. [email protected] http://mail.lists.hdfgroup.org/mailman/listinfo/hdf-forum_lists.hdfgroup.org _______________________________________________ Hdf-forum is for HDF software users discussion. [email protected] http://mail.lists.hdfgroup.org/mailman/listinfo/hdf-forum_lists.hdfgroup.org
