!************************************************************ ! ! This example shows how to read and write fixed C string datatypes ! to an attribute. The program first writes C strings 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 verion 1.8 ! with --enable-fortran2003 ! !************************************************************ PROGRAM main USE HDF5 USE ISO_C_BINDING IMPLICIT NONE CHARACTER(LEN=24), PARAMETER :: filename = "h5ex_t_stringCatt_F03.h5" CHARACTER(LEN=3) , PARAMETER :: dataset = "DS1" CHARACTER(LEN=2) , PARAMETER :: attribute = "A1" INTEGER , PARAMETER :: dim0 = 4 INTEGER(SIZE_T) , PARAMETER :: sdim = 7 INTEGER(HID_T) :: file, filetype, memtype, space, dset, attr ! Handles INTEGER :: hdferr INTEGER(hsize_t), DIMENSION(1:1) :: dims = (/dim0/) INTEGER(HSIZE_T), DIMENSION(1:1) :: maxdims CHARACTER(LEN=sdim), DIMENSION(1:dim0), TARGET :: & wdata = (/"Parting","is such", "sweet ", "sorrow."/) CHARACTER(LEN=sdim), DIMENSION(:), ALLOCATABLE, TARGET :: rdata INTEGER :: i INTEGER(SIZE_T) :: size TYPE(C_PTR) :: f_ptr ! ! 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 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 dataspace. ! CALL h5screate_simple_f(1, dims, space, hdferr) ! ! Create the attribute and write the string data to it. ! CALL H5Acreate_f(dset, attribute, filetype, space, attr, hdferr) f_ptr = C_LOC(wdata(1)(1:1)) CALL H5Awrite_f(attr, memtype, 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(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) CALL h5aopen_f(dset, attribute, attr, hdferr) ! ! Get the datatype and its size. ! CALL H5Aget_type_f(attr, filetype, hdferr) CALL H5Tget_size_f(filetype, size, hdferr) ! Make sure the declared length is large enough IF(size.GT.sdim+1)THEN PRINT*,'ERROR: Character LEN is to small' STOP ENDIF ! ! 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))) ! ! 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 H5Aread_f(attr, memtype, f_ptr, hdferr) ! ! Output the data to the screen. ! DO i = 1, dims(1) WRITE(*,'(A,"(",I0,"): ", A)') attribute, i, rdata(i) END DO ! ! Close and release resources. ! CALL H5Aclose_f(attr, hdferr) CALL H5Dclose_f(dset, hdferr) CALL H5Sclose_f(space, hdferr) CALL H5Tclose_f(memtype, hdferr) CALL H5Fclose_f(file, hdferr) DEALLOCATE(rdata) END PROGRAM main