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h5ex_t_vlstring_F03.F90
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h5ex_t_vlstring_F03.F90
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!************************************************************
!
! This example shows how to read and write variable-length
! string datatypes to a dataset using h5dread_f and
! h5dwrite_f, and F2003 intrinsics C_LOC and C_F_POINTER.
! 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
! and --enable-fortran2003
!
!************************************************************
PROGRAM main
USE HDF5
USE ISO_C_BINDING
IMPLICIT NONE
CHARACTER(LEN=20), PARAMETER :: filename = "h5ex_vlstring_F03.h5"
CHARACTER(LEN=3) , PARAMETER :: dataset = "DS1"
INTEGER(HSIZE_T), PARAMETER :: dim0 = 4
INTEGER(SIZE_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
TYPE(C_PTR), DIMENSION(1:dim0), TARGET :: wdata
CHARACTER(len=8, KIND=c_char), DIMENSION(1), TARGET :: A = "Parting"//C_NULL_CHAR
CHARACTER(len=8, KIND=c_char), DIMENSION(1), TARGET :: B = "is_such"//C_NULL_CHAR
CHARACTER(len=6, KIND=c_char), DIMENSION(1), TARGET :: C = "sweet"//C_NULL_CHAR
CHARACTER(len=8, KIND=c_char), DIMENSION(1), TARGET :: D = "sorrow."//C_NULL_CHAR
TYPE(C_PTR), DIMENSION(:), ALLOCATABLE, TARGET :: rdata ! Read buffer
CHARACTER(len = 8, kind=c_char), POINTER :: data ! A pointer to a Fortran string
TYPE(C_PTR) :: f_ptr
INTEGER :: i, len
! Initialize array of C pointers
wdata(1) = C_LOC(A(1)(1:1))
wdata(2) = C_LOC(B(1)(1:1))
wdata(3) = C_LOC(C(1)(1:1))
wdata(4) = C_LOC(D(1)(1:1))
!
! 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)
!
! 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)
f_ptr = C_LOC(wdata(1))
CALL h5dwrite_f(dset, filetype, f_ptr, hdferr )
!
! 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.
!
f_ptr = C_LOC(rdata(1))
CALL h5dread_f(dset, H5T_STRING, f_ptr, hdferr)
!
! Output the data to the screen.
!
DO i = 1, dims(1)
CALL C_F_POINTER(rdata(i), data)
len = 0
DO
IF(DATA(len+1:len+1).EQ.C_NULL_CHAR.OR.len.GE.8) EXIT
len = len + 1
ENDDO
WRITE(*,'(A,"(",I0,"): ",A)') DATASET, i, data(1:len)
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