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!************************************************************
!
! This example shows how to read and write opaque datatypes
! to an attribute. The program first writes opaque data to
! an attribute with a dataspace of DIM0, then closes the
! file. Next, it reopens the file, reads back the data, and
! outputs it to the screen.
!
! This file is intended for use with HDF5 Library version 1.8
! with --enable-fortran2003
!
!************************************************************
PROGRAM main
USE HDF5
USE ISO_C_BINDING
IMPLICIT NONE
CHARACTER(LEN=23), PARAMETER :: filename = "h5ex_t_opaqueatt_F03.h5"
CHARACTER(LEN=3) , PARAMETER :: dataset = "DS1"
CHARACTER(LEN=2) , PARAMETER :: attribute = "A1"
INTEGER , PARAMETER :: dim0 = 4
INTEGER(SIZE_T) , PARAMETER :: size = 7
INTEGER(HID_T) :: file, space, dtype, dset, attr ! Handles
INTEGER :: hdferr
INTEGER(size_t) :: len
INTEGER(hsize_t), DIMENSION(1:1) :: dims = (/DIM0/)
CHARACTER(LEN=size), DIMENSION(1:dim0), TARGET :: wdata ! Write buffer
CHARACTER(LEN=size), DIMENSION(:), ALLOCATABLE, TARGET :: rdata ! Read buffer
CHARACTER(LEN=size-1) :: str = "OPAQUE"
CHARACTER(LEN=80) :: tag
INTEGER :: taglen
INTEGER(HSIZE_T), DIMENSION(1:1) :: maxdims
INTEGER :: i
CHARACTER(LEN=1) :: ichr
TYPE(C_PTR) :: f_ptr
!
! Initialize FORTRAN interface.
!
CALL h5open_f(hdferr)
!
! Initialize data.
!
DO i = 1, dim0
WRITE(ichr,'(I1)') i-1
wdata(i) = str//ichr
ENDDO
!
! Create a new file using the default properties.
!
CALL h5fcreate_f(filename, H5F_ACC_TRUNC_F, file, hdferr)
!
! Create dataset with a null dataspace.
!
CALL h5screate_f(H5S_NULL_F,space,hdferr)
CALL h5dcreate_f(file, dataset, H5T_STD_I32LE, space, dset, hdferr)
CALL h5sclose_f(space, hdferr)
!
! Create opaque datatype and set the tag to something appropriate.
! For this example we will write and view the data as a character
! array.
!
CALL h5tcreate_f(h5T_OPAQUE_F, size, dtype, hdferr)
CALL h5tset_tag_f(dtype,"Character array",hdferr)
!
! Create dataspace. Setting maximum size to be the current size.
!
CALL h5screate_simple_f(1, dims, space, hdferr)
!
! Create the attribute and write the opaque data to it.
!
CALL H5Acreate_f(dset, attribute, dtype, space, attr, hdferr)
f_ptr = C_LOC(wdata(1)(1:1))
CALL H5Awrite_f(attr, dtype, f_ptr, hdferr)
!
! Close and release resources.
!
CALL H5Aclose_f(attr, hdferr)
CALL H5Dclose_f(dset, hdferr)
CALL H5Sclose_f(space, hdferr)
CALL H5Tclose_f(dtype, hdferr)
CALL H5Fclose_f(file, hdferr)
!
! Now we begin the read section of this example.
!
! Open file and dataset, and attribute.
!
CALL h5fopen_f(filename, H5F_ACC_RDONLY_F, file, hdferr)
CALL h5dopen_f(file, dataset, dset, hdferr)
CALL h5aopen_f(dset, attribute, attr, hdferr)
!
! Get datatype and properties for the datatype.
!
CALL h5aget_type_f(attr, dtype, hdferr)
CALL h5tget_size_f(dtype, len, hdferr)
CALL h5tget_tag_f(dtype, tag, taglen, hdferr)
!
! Get dataspace and allocate memory for read buffer.
!
CALL h5aget_space_f(attr, space, hdferr)
CALL h5sget_simple_extent_dims_f(space, dims, maxdims, hdferr)
ALLOCATE(rdata(1:dims(1)))
!
! Read the data.
!
f_ptr = C_LOC(rdata(1)(1:1))
CALL h5aread_f(attr, dtype, f_ptr, hdferr)
!
! Output the data to the screen.
!
WRITE(*,'("Datatype tag for ",A," is: ",A)') ATTRIBUTE, '"'//tag(1:taglen)//'"'
DO i = 1, dims(1)
WRITE(*,'(A,"[",i1,"]: ",A)') attribute,i-1,rdata(i)
ENDDO
!
! Close and release resources.
!
DEALLOCATE(rdata)
CALL H5Aclose_f(attr, hdferr)
CALL H5Dclose_f(dset, hdferr)
CALL H5Sclose_f(space, hdferr)
CALL H5Tclose_f(dtype, hdferr)
CALL H5Fclose_f(file, hdferr)
END PROGRAM main
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