// Get reads data from the file.
func (f *File) Get(name string, something interface{}) error {
value := reflect.ValueOf(something)
if value.Kind() != reflect.Ptr {
return errors.New("expected a pointer")
}
value = reflect.Indirect(value)
cname := C.CString(name)
defer C.free(unsafe.Pointer(cname))
did := C.H5Dopen2(f.fid, cname, C.H5P_DEFAULT)
if did < 0 {
return errors.New("cannot find the dataset")
}
defer C.H5Dclose(did)
object := newObject()
defer object.free()
object.tid = C.H5Dget_type(did)
if object.tid < 0 {
return errors.New("cannot get the datatype of the dataset")
}
if err := initializeToGet(object, value); err != nil {
return err
}
if C.H5Dread(did, object.tid, C.H5S_ALL, C.H5S_ALL, C.H5P_DEFAULT, object.data) < 0 {
return errors.New("cannot read the dataset from the file")
}
if err := finalizeToGet(object, value); err != nil {
return err
}
one := C.hsize_t(1)
sid := C.H5Screate_simple(1, (*C.hsize_t)(unsafe.Pointer(&one)), nil)
if sid < 0 {
return errors.New("cannot create a data space")
}
defer C.H5Sclose(sid)
if C.H5Dvlen_reclaim(object.tid, sid, C.H5P_DEFAULT, object.data) < 0 {
return errors.New("cannot reclaim memory")
}
return nil
}
func openDataset(id C.hid_t, name string) (*Dataset, error) {
c_name := C.CString(name)
defer C.free(unsafe.Pointer(c_name))
hid := C.H5Dopen2(id, c_name, P_DEFAULT.id)
if err := h5err(C.herr_t(int(hid))); err != nil {
return nil, err
}
return newDataset(hid), nil
}
// OpenDataset opens a named Dataset.
func (g *CommonFG) OpenDataset(name string) (*Dataset, error) {
c_name := C.CString(name)
defer C.free(unsafe.Pointer(c_name))
hid := C.H5Dopen2(g.id, c_name, P_DEFAULT.id)
if err := checkID(hid); err != nil {
return nil, err
}
return newDataset(hid), nil
}
// Opens an existing dataset.
// hid_t H5Dopen( hid_t loc_id, const char *name, hid_t dapl_id )
func (f *File) OpenDataSet(name string) (*DataSet, error) {
c_name := C.CString(name)
defer C.free(unsafe.Pointer(c_name))
hid := C.H5Dopen2(f.id, c_name, P_DEFAULT.id)
err := togo_err(C.herr_t(int(hid)))
if err != nil {
return nil, err
}
dset := new_dataset(hid)
return dset, err
}