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Diffstat (limited to 'HDF5Examples/FORTRAN/H5T/h5ex_t_vlstring.F90')
-rw-r--r-- | HDF5Examples/FORTRAN/H5T/h5ex_t_vlstring.F90 | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/HDF5Examples/FORTRAN/H5T/h5ex_t_vlstring.F90 b/HDF5Examples/FORTRAN/H5T/h5ex_t_vlstring.F90 new file mode 100644 index 0000000..e482973 --- /dev/null +++ b/HDF5Examples/FORTRAN/H5T/h5ex_t_vlstring.F90 @@ -0,0 +1,109 @@ +!************************************************************ +! +! 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 |