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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