/*-------------------------------------------------------------------------
* Function: test_create
*
* Purpose: Attempts to create a dataset.
*
* Return: Success: 0
*
* Failure: -1
*
* Programmer: Binh-Minh Ribler (using C version)
* Friday, January 5, 2001
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
static herr_t
test_create( H5File& file)
{
SUBTEST("create, open, close");
// Setting this to NULL for cleaning up in failure situations
DataSet *dataset = NULL;
try {
// Create a data space
hsize_t dims[2];
dims[0] = 256;
dims[1] = 512;
DataSpace space (2, dims, NULL);
// Create a dataset using the default dataset creation properties.
// We're not sure what they are, so we won't check.
dataset = new DataSet (file.createDataSet
(DSET_DEFAULT_NAME, PredType::NATIVE_DOUBLE, space));
// Add a comment to the dataset
file.setComment (DSET_DEFAULT_NAME, "This is a dataset");
// Close the dataset
delete dataset;
dataset = NULL;
// Try creating a dataset that already exists. This should fail since a
// dataset can only be created once. If an exception is not thrown for
// this action by createDataSet, then throw an invalid action exception.
try {
dataset = new DataSet (file.createDataSet
(DSET_DEFAULT_NAME, PredType::NATIVE_DOUBLE, space));
// continuation here, that means no exception has been thrown
throw InvalidActionException("H5File::createDataSet", "Library allowed overwrite of existing dataset");
}
catch (FileIException E) // catching invalid creating dataset
{} // do nothing, exception expected
// Open the dataset we created above and then close it. This is one
// way to open an existing dataset for accessing.
dataset = new DataSet (file.openDataSet (DSET_DEFAULT_NAME));
// Get and verify the name of this dataset, using
// H5std_string getObjName()
H5std_string ds_name = dataset->getObjName();
verify_val(ds_name, DSET_DEFAULT_NAME_PATH, "DataSet::getObjName", __LINE__, __FILE__);
// Get and verify the comment from this dataset, using
// H5std_string getComment(const H5std_string& name, <buf_size=0, by default>)
H5std_string comment = file.getComment(DSET_DEFAULT_NAME);
verify_val(comment, "This is a dataset", "DataSet::getComment", __LINE__, __FILE__);
// Close the dataset when accessing is completed
delete dataset;
// This is another way to open an existing dataset for accessing.
DataSet another_dataset(file.openDataSet (DSET_DEFAULT_NAME));
// Try opening a non-existent dataset. This should fail so if an
// exception is not thrown for this action by openDataSet, then
// display failure information and throw an exception.
try {
dataset = new DataSet (file.openDataSet( "does_not_exist" ));
// continuation here, that means no exception has been thrown
throw InvalidActionException("H5File::openDataSet", "Attempted to open a non-existent dataset");
}
catch (FileIException E ) // catching creating non-existent dataset
{} // do nothing, exception expected
// Create a new dataset that uses chunked storage instead of the default
// layout.
DSetCreatPropList create_parms;
hsize_t csize[2];
csize[0] = 5;
csize[1] = 100;
create_parms.setChunk( 2, csize );
dataset = new DataSet (file.createDataSet
(DSET_CHUNKED_NAME, PredType::NATIVE_DOUBLE, space, create_parms));
// Note: this one has no error message in C when failure occurs?
// clean up and return with success
delete dataset;
PASSED();
return 0;
} // outer most try block
catch (InvalidActionException E)
{
cerr << " FAILED" << endl;
cerr << " <<< " << E.getDetailMsg() << " >>>" << endl << endl;
// clean up and return with failure
if (dataset != NULL)
delete dataset;
return -1;
}
// catch all other exceptions
catch (Exception E)
{
issue_fail_msg("test_create", __LINE__, __FILE__);
// clean up and return with failure
if (dataset != NULL)
delete dataset;
return -1;
}
} // test_create
