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! This example shows how to create and write a dataset attribute.
! It opens the existing file 'dset.h5', obtains the identifier of
! the dataset "/dset", defines attribute's dataspace,
! creates dataset attribute, writes the attribute, and then closes
! the attribute's dataspace, attribute, dataset, and file.
PROGRAM ATTREXAMPLE
USE HDF5 ! This module contains all necessary modules
IMPLICIT NONE
CHARACTER(LEN=8), PARAMETER :: filename = "dsetf.h5" ! File name
CHARACTER(LEN=4), PARAMETER :: dsetname = "dset" ! Dataset name
CHARACTER(LEN=9), PARAMETER :: aname = "attr_long" ! Attribute name
INTEGER(HID_T) :: file_id ! File identifier
INTEGER(HID_T) :: dset_id ! Dataset identifier
INTEGER(HID_T) :: attr_id ! Attribute identifier
INTEGER(HID_T) :: aspace_id ! Attribute Dataspace identifier
INTEGER(HID_T) :: atype_id ! Attribute Dataspace identifier
INTEGER(HSIZE_T), DIMENSION(1) :: adims = (/2/) ! Attribute dimension
INTEGER :: arank = 1 ! Attribure rank
INTEGER(SIZE_T) :: attrlen ! Length of the attribute string
! CHARACTER*27, DIMENSION(2) :: attr_data ! Attribute data
CHARACTER*80, DIMENSION(2) :: attr_data ! Attribute data
INTEGER :: error ! Error flag
INTEGER, DIMENSION(7) :: data_dims
!
! Initialize attribute's data
!
attr_data(1) = "Dataset character attribute"
attr_data(2) = "Some other string here "
! attrlen = 27
attrlen = 80
!
! Initialize FORTRAN interface.
!
CALL h5open_f(error)
!
! Open an existing file.
!
CALL h5fopen_f (filename, H5F_ACC_RDWR_F, file_id, error)
!
! Open an existing dataset.
!
CALL h5dopen_f(file_id, dsetname, dset_id, error)
!
! Create scalar data space for the attribute.
!
CALL h5screate_simple_f(arank, adims, aspace_id, error)
!
! Create datatype for the attribute.
!
CALL h5tcopy_f(H5T_NATIVE_CHARACTER, atype_id, error)
CALL h5tset_size_f(atype_id, attrlen, error)
!
! Create dataset attribute.
!
CALL h5acreate_f(dset_id, aname, atype_id, aspace_id, &
attr_id, error)
!
! Write the attribute data.
!
data_dims(1) = 2
CALL h5awrite_f(attr_id, atype_id, attr_data, data_dims, error)
!
! Close the attribute.
!
CALL h5aclose_f(attr_id, error)
!
! Terminate access to the data space.
!
CALL h5sclose_f(aspace_id, error)
!
! End access to the dataset and release resources used by it.
!
CALL h5dclose_f(dset_id, error)
!
! Close the file.
!
CALL h5fclose_f(file_id, error)
!
! Close FORTRAN interface.
!
CALL h5close_f(error)
END PROGRAM ATTREXAMPLE
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