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Diffstat (limited to 'HDF5Examples/FORTRAN/H5T/h5ex_t_Cstring_F03.F90')
-rw-r--r-- | HDF5Examples/FORTRAN/H5T/h5ex_t_Cstring_F03.F90 | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/HDF5Examples/FORTRAN/H5T/h5ex_t_Cstring_F03.F90 b/HDF5Examples/FORTRAN/H5T/h5ex_t_Cstring_F03.F90 new file mode 100644 index 0000000..cd8788b --- /dev/null +++ b/HDF5Examples/FORTRAN/H5T/h5ex_t_Cstring_F03.F90 @@ -0,0 +1,123 @@ +!************************************************************ +! +! This example shows how to write a C string to a dataset +! and read it back as a Fortran string. +! The program first writes the C +! strings to a dataset with a dataspace of DIM0, then closes the file. +! Next, it reopens the file, reads back the data into a Fortran +! fixed character string, 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=21), PARAMETER :: filename = "h5ex_t_Cstring_F03.h5" + CHARACTER(LEN=3) , PARAMETER :: dataset = "DS1" + INTEGER , PARAMETER :: dim0 = 4 + INTEGER(SIZE_T) , PARAMETER :: sdim = 7 + + INTEGER(HID_T) :: file, filetype, memtype, space, dset ! Handles + INTEGER :: hdferr + + INTEGER(HSIZE_T), DIMENSION(1:1) :: dims = (/dim0/) + + CHARACTER(LEN=sdim), DIMENSION(1:dim0), TARGET :: wdata = (/"Parting", "is such", "sweet ", "sorrow."/) + CHARACTER(LEN=sdim), DIMENSION(1:dim0), TARGET :: rdata + + TYPE(c_ptr) :: f_ptr + INTEGER(HSIZE_T), DIMENSION(1:1) :: maxdims + INTEGER :: i + INTEGER(SIZE_T) :: size + ! + ! 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 strings + ! + + ! Include the NULL TERMINATION of string in C (i.e. add +1 to the length) + + CALL H5Tcopy_f(H5T_C_S1, filetype, hdferr) + CALL H5Tset_size_f(filetype, sdim+1, hdferr) + + CALL H5Tcopy_f( H5T_FORTRAN_S1, memtype, hdferr) + CALL H5Tset_size_f(memtype, sdim, hdferr) + ! + ! Create dataspace. + ! + CALL h5screate_simple_f(1, dims, space, hdferr) + ! + ! Create the dataset and write the string data to it. + ! + CALL h5dcreate_f(file, dataset, filetype, space, dset, hdferr) + + f_ptr = C_LOC(wdata(1)(1:1)) + CALL H5Dwrite_f(dset, memtype, f_ptr, hdferr) + + ! + ! Close and release resources. + ! + CALL h5dclose_f(dset , hdferr) + CALL h5sclose_f(space, hdferr) + CALL H5Tclose_f(filetype, hdferr) + CALL H5Tclose_f(memtype, 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 and its size. + ! + CALL H5Dget_type_f(dset, filetype, hdferr) + CALL H5Tget_size_f(filetype, size, hdferr) + + ! Get dataspace. + ! + CALL H5Dget_space_f(dset, space, hdferr) + CALL H5Sget_simple_extent_dims_f(space, dims, maxdims, hdferr) + ! + ! Create the memory datatype. + ! + CALL H5Tcopy_f (H5T_FORTRAN_S1, memtype, hdferr) + CALL H5Tset_size_f (memtype, sdim, hdferr) + + ! + ! Read the data. + ! + f_ptr = C_LOC(rdata(1)(1:1)) + CALL H5Dread_f(dset, memtype, f_ptr, hdferr, space) + ! + ! Output the data to the screen. + ! + DO i = 1, dims(1) + WRITE(*,'(A,"(",I0,"): ", A)') DATASET, i, rdata(i) + END DO + ! + ! Close and release resources. + ! + CALL H5Dclose_f(dset, hdferr) + CALL H5Sclose_f(space, hdferr) + CALL H5Tclose_f(filetype, hdferr) + CALL H5Tclose_f(memtype, hdferr) + CALL H5Fclose_f(file, hdferr) + +END PROGRAM main |