Hi all,
My understanding is that it is not valid to write a comment to an
attribute. However, the following code runs without error on
1.8.5-p1:
#include <hdf5.h>
int main()
{
const hid_t f = H5Fcreate(
"foo.h5", H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
H5Oset_comment(f, "file comment");
hsize_t dims = 1;
const hid_t s = H5Screate_simple(1, &dims, NULL);
const hid_t a = H5Acreate2(
f, "x", H5T_NATIVE_INT, s, H5P_DEFAULT, H5P_DEFAULT);
H5Sclose(s);
int x = 5;
H5Awrite(a, H5T_NATIVE_INT, &x);
H5Oset_comment(a, "attribute comment");
H5Aclose(a);
H5Fclose(f);
return 0;
}
Running the compiled binary and examining the foo.h5 file it produces
with h5dump shows
HDF5 "foo.h5" {
GROUP "/" {
COMMENT "attribute comment"
ATTRIBUTE "x" {
DATATYPE H5T_STD_I32LE
DATASPACE SIMPLE { ( 1 ) / ( 1 ) }
DATA {
(0): 5
}
}
}
}
where it appears that setting the comment on an attribute overwrites
the file-level comment.
Two questions arise:
1) Am I incorrect in saying that an attribute cannot contain a comment?
2) Is HDF5 1.8.5-p1 failing to detect a usage error in my sample code?
Thanks,
Rhys
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