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
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