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!************************************************************
!
! This example shows how to read and write variable-length
! string datatypes to a dataset. The program first writes
! variable-length strings to a dataset 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
!
!
!************************************************************
PROGRAM main
USE HDF5
IMPLICIT NONE
CHARACTER(LEN=18), PARAMETER :: filename = "h5ex_t_vlstring.h5"
CHARACTER(LEN=3) , PARAMETER :: dataset = "DS1"
INTEGER(HSIZE_T), PARAMETER :: dim0 = 4
INTEGER(HSIZE_T), PARAMETER :: sdim = 7
INTEGER(HID_T) :: file, filetype, space, dset ! Handles
INTEGER :: hdferr
INTEGER(HSIZE_T), DIMENSION(1:1) :: dims = (/dim0/)
INTEGER(HSIZE_T), DIMENSION(1:2) :: maxdims
CHARACTER(LEN=sdim), DIMENSION(1:dim0), TARGET :: &
wdata = (/"Parting", "is such", "sweet ", "sorrow."/) ! Write buffer
CHARACTER(LEN=sdim), DIMENSION(:), ALLOCATABLE :: rdata ! Read buffer
INTEGER(HSIZE_T), DIMENSION(2) :: data_dims = (/sdim,dim0/)
INTEGER(SIZE_T), DIMENSION(4) :: str_len = (/7,7,5,7/)
INTEGER :: i
!
! Initialize FORTRAN interface.
!
CALL h5open_f(hdferr)
!
! Create a new file using the default properties.
!
CALL h5fcreate_f(filename, H5F_ACC_TRUNC_F, file, hdferr)
!
! Create file and memory datatypes. For this example we will save
! the strings as C variable length strings, H5T_STRING is defined
! as a variable length string.
!
CALL H5Tcopy_f(H5T_STRING, filetype, hdferr)
CALL H5Tset_strpad_f(filetype, H5T_STR_NULLPAD_F, hdferr)
!
! Create dataspace.
!
CALL h5screate_simple_f(1, dims, space, hdferr)
!
! Create the dataset and write the variable-length string data to
! it.
!
CALL h5dcreate_f(file, dataset, filetype, space, dset, hdferr)
CALL h5dwrite_vl_f(dset, filetype, wdata, data_dims, str_len, hdferr, space)
!
! Close and release resources.
!
CALL h5dclose_f(dset , hdferr)
CALL h5sclose_f(space, hdferr)
CALL H5Tclose_f(filetype, hdferr)
CALL h5fclose_f(file , hdferr)
!
! Now we begin the read section of this example.
!
!
! Open file and dataset.
!
CALL h5fopen_f(filename, H5F_ACC_RDONLY_F, file, hdferr)
CALL h5dopen_f(file, dataset, dset, hdferr)
!
! Get the datatype.
!
CALL H5Dget_type_f(dset, filetype, hdferr)
!
! Get dataspace and allocate memory for read buffer.
!
CALL H5Dget_space_f(dset, space, hdferr)
CALL H5Sget_simple_extent_dims_f(space, dims, maxdims, hdferr)
ALLOCATE(rdata(1:dims(1)))
!
! Read the data.
!
CALL h5dread_vl_f(dset, filetype, rdata, data_dims, str_len, hdferr, space)
!
! Output the data to the screen.
!
DO i = 1, dims(1)
WRITE(*,'(A,"(",I0,"): ",A)') DATASET, i, rdata(i)
END DO
DEALLOCATE(rdata)
CALL h5dclose_f(dset , hdferr)
CALL h5sclose_f(space, hdferr)
CALL H5Tclose_f(filetype, hdferr)
CALL h5fclose_f(file , hdferr)
END PROGRAM main
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