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17_refobjexample.f90
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! * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
! Copyright by The HDF Group. *
! Copyright by the Board of Trustees of the University of Illinois. *
! All rights reserved. *
! *
! This file is part of HDF5. The full HDF5 copyright notice, including *
! terms governing use, modification, and redistribution, is contained in *
! the files COPYING and Copyright.html. COPYING can be found at the root *
! of the source code distribution tree; Copyright.html can be found at the *
! root level of an installed copy of the electronic HDF5 document set and *
! is linked from the top-level documents page. It can also be found at *
! http://hdfgroup.org/HDF5/doc/Copyright.html. If you do not have *
! access to either file, you may request a copy from help@hdfgroup.org. *
! * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
!
!
! This program shows how to create and store references to the objects.
! Program creates a file, two groups, a dataset to store integer data and
! a dataset to store references to the objects.
! Stored references are used to open the objects they are point to.
! Data is written to the dereferenced dataset, and class type is displayed for
! the shared datatype.
!
PROGRAM OBJ_REFERENCES
USE HDF5 ! This module contains all necessary modules
IMPLICIT NONE
CHARACTER(LEN=10), PARAMETER :: filename = "FORTRAN.h5" ! File
CHARACTER(LEN=8), PARAMETER :: dsetnamei = "INTEGERS" ! Dataset with the integer data
CHARACTER(LEN=17), PARAMETER :: dsetnamer = "OBJECT_REFERENCES" ! Dataset wtih object
! references
CHARACTER(LEN=6), PARAMETER :: groupname1 = "GROUP1" ! Groups in the file
CHARACTER(LEN=6), PARAMETER :: groupname2 = "GROUP2" !
INTEGER(HID_T) :: file_id ! File identifier
INTEGER(HID_T) :: grp1_id ! Group identifiers
INTEGER(HID_T) :: grp2_id !
INTEGER(HID_T) :: dset_id ! Dataset identifiers
INTEGER(HID_T) :: dsetr_id !
INTEGER(HID_T) :: type_id ! Type identifier
INTEGER(HID_T) :: space_id ! Dataspace identifiers
INTEGER(HID_T) :: spacer_id !
INTEGER :: error
INTEGER(HSIZE_T), DIMENSION(1) :: dims = (/5/)
INTEGER(HSIZE_T), DIMENSION(1) :: dimsr= (/4/)
INTEGER(HSIZE_T), DIMENSION(1) :: my_maxdims = (/5/)
INTEGER :: rank = 1
INTEGER :: rankr = 1
TYPE(hobj_ref_t_f), DIMENSION(4) :: ref
TYPE(hobj_ref_t_f), DIMENSION(4) :: ref_out
INTEGER, DIMENSION(5) :: data = (/1, 2, 3, 4, 5/)
INTEGER :: class
INTEGER(HSIZE_T), DIMENSION(2) :: data_dims, ref_size
!
! Initialize FORTRAN interface.
!
CALL h5open_f(error)
!
! Create a file
!
CALL h5fcreate_f(filename, H5F_ACC_TRUNC_F, file_id, error)
! Default file access and file creation
! properties are used.
!
! Create a group in the file
!
CALL h5gcreate_f(file_id, groupname1, grp1_id, error)
!
! Create a group inside the created gorup
!
CALL h5gcreate_f(grp1_id, groupname2, grp2_id, error)
!
! Create dataspaces for datasets
!
CALL h5screate_simple_f(rank, dims, space_id, error, maxdims=my_maxdims)
CALL h5screate_simple_f(rankr, dimsr, spacer_id, error)
!
! Create integer dataset
!
CALL h5dcreate_f(file_id, dsetnamei, H5T_NATIVE_INTEGER, space_id, &
dset_id, error)
!
! Create dataset to store references to the objects
!
CALL h5dcreate_f(file_id, dsetnamer, H5T_STD_REF_OBJ, spacer_id, &
dsetr_id, error)
!
! Create a datatype and store in the file
!
CALL h5tcopy_f(H5T_NATIVE_REAL, type_id, error)
CALL h5tcommit_f(file_id, "MyType", type_id, error)
!
! Close dataspaces, groups and integer dataset
!
CALL h5sclose_f(space_id, error)
CALL h5sclose_f(spacer_id, error)
CALL h5tclose_f(type_id, error)
CALL h5dclose_f(dset_id, error)
CALL h5gclose_f(grp1_id, error)
CALL h5gclose_f(grp2_id, error)
!
! Create references to two groups, integer dataset and shared datatype
! and write it to the dataset in the file
!
CALL h5rcreate_f(file_id, groupname1, ref(1), error)
CALL h5rcreate_f(file_id, "/GROUP1/GROUP2", ref(2), error)
CALL h5rcreate_f(file_id, dsetnamei, ref(3), error)
CALL h5rcreate_f(file_id, "MyType", ref(4), error)
ref_size(1) = size(ref)
CALL h5dwrite_f(dsetr_id, H5T_STD_REF_OBJ, ref, ref_size, error)
!
! Close the dataset
!
CALL h5dclose_f(dsetr_id, error)
!
! Reopen the dataset with object references and read references to the buffer
!
CALL h5dopen_f(file_id, dsetnamer,dsetr_id,error)
ref_size(1) = size(ref_out)
CALL h5dread_f(dsetr_id, H5T_STD_REF_OBJ, ref_out, ref_size, error)
!
! Dereference the third reference. We know that it is a dataset. On practice
! one should use h5rget_object_type_f function to find out
! the type of an object the reference points to.
!
CALL h5rdereference_f(dsetr_id, ref(3), dset_id, error)
!
! Write data to the dataset.
!
data_dims(1) = size(data)
CALL h5dwrite_f(dset_id, H5T_NATIVE_INTEGER, data, data_dims, error)
if (error .eq. 0) write(*,*) "Data has been successfully written to the dataset "
!
! Dereference the fourth reference. We know that it is a datatype. On practice
! one should use h5rget_object_type_f function to find out
! the type of an object the reference points to.
!
CALL h5rdereference_f(dsetr_id, ref(4), type_id, error)
!
! Get datatype class and display it if it is of a FLOAT class.
!
CALL h5tget_class_f(type_id, class, error)
if(class .eq. H5T_FLOAT_F) write(*,*) "Stored datatype is of a FLOAT class"
!
! Close all objects.
!
CALL h5dclose_f(dset_id, error)
CALL h5tclose_f(type_id, error)
CALL h5dclose_f(dsetr_id, error)
CALL h5fclose_f(file_id, error)
!
! Close FORTRAN interface.
!
CALL h5close_f(error)
END PROGRAM OBJ_REFERENCES