Below are two exmaples:
testH5Vlen() uses the HDF5 Java wrapper
testH5VlenObj() uses the object level (high level)
=================
private static void testH5Vlen(final String filename) throws Exception
{
String buf[] = {"Parting", "is such", "sweet", "sorrow."};
// Case 1, may run into infinite loop
// int tid = H5.H5Tvlen_create(HDF5Constants.H5T_C_S1);
// Case 2, differnt failure on differnt platforms
int tid = H5.H5Tcopy(HDF5Constants.H5T_C_S1);
H5.H5Tset_size(tid, HDF5Constants.H5T_VARIABLE);
int fid = H5.H5Fcreate(filename, HDF5Constants.H5F_ACC_TRUNC,
HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT);
int sid = H5.H5Screate_simple(1, new long[] {4}, null);
int did = H5.H5Dcreate(fid, "/str", tid, sid,
HDF5Constants.H5P_DEFAULT);
// write() fails on both case 1 and 2
H5.H5Dwrite(did, tid, HDF5Constants.H5S_ALL,
HDF5Constants.H5S_ALL, HDF5Constants.H5P_DEFAULT, buf);
// clean up
H5.H5Dclose(did);
H5.H5Sclose(sid);
H5.H5Tclose(tid);
H5.H5Fclose(fid);
}
private static void testH5VlenObj(final String fname) throws Exception
{
int strLen = -1;
long[] dims = {4};
String buf[] = {"Parting", "is such", "sweet", "sorrow."};
// create a new file with a given file name.
H5File testFile = new H5File(fname, H5File.CREATE);
testFile.open();
Group root =
(Group)((javax.swing.tree.DefaultMutableTreeNode)testFile.getRootNode()).getUserObject();
Datatype dtype = testFile.createDatatype(Datatype.CLASS_STRING,
strLen, Datatype.NATIVE, Datatype.NATIVE);
Dataset dataset = testFile.createScalarDS ("/str", root, dtype,
dims, null, null, 0, buf);
testFile.close();
}
On 3/24/2011 11:54 AM, Konrad Hinsen wrote:
My next problem with the high-level Java API is creating
variable-length strings, either in datasets or as attribute values.
Nothing but strange error messages... To start with, if I create a
H5Datatype of CLASS_VLEN and ask for its description, it is "unknown".
Any use of such a datatype leads to exceptions. Does anyone have a
working example?
Thanks in advance,
Konrad.
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