Hi,
I've seen the Java example for variable length string datasets, but I just want
to write some attributes. What I'm trying to do is create files with UTF8
string attributes that can be easily read by h5py. But the only way h5py will
work with UTF8 attributes is if they're variable length.
The code below works fine for a fixed length attribute, but crashes the JVM
when I set the dtype size to H5T_VARIABLE.
import java.io.File;
import static ncsa.hdf.hdf5lib.H5.*;
import static ncsa.hdf.hdf5lib.HDF5Constants.*;
import org.apache.log4j.BasicConfigurator;
public class WriteVariableUTF8 {
public static void main(String[] args) throws Exception {
BasicConfigurator.configure(); // log4j.
byte[] bytes = "world".getBytes("UTF-8");
File path = new File("C:/Users/dan/variableutf8.h5");
int file = H5Fcreate(path.getAbsolutePath(), H5F_ACC_TRUNC,
H5P_DEFAULT, H5P_DEFAULT);
int dtype = H5Tcopy(H5T_C_S1);
H5Tset_cset(dtype, H5T_CSET_UTF8);
H5Tset_size(dtype, H5T_VARIABLE); // works if I set size to
bytes.length.
H5Tset_strpad(dtype, H5T_STR_NULLTERM);
int space = H5Screate(H5S_SCALAR);
int attr = H5Acreate(file, "hello", dtype, space, H5P_DEFAULT,
H5P_DEFAULT);
H5Awrite(attr, dtype, bytes);
H5Aclose(attr);
H5Sclose(space);
H5Fclose(file);
}
}
Thanks for your help,
Dan Tetlow
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