!************************************************************ ! ! This example shows how to read and write opaque datatypes ! to a dataset. The program first writes opaque data 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 ! with --enable-fortran2003 ! !************************************************************ PROGRAM main USE HDF5 USE ISO_C_BINDING IMPLICIT NONE CHARACTER(LEN=20), PARAMETER :: filename = "h5ex_t_opaque_F03.h5" CHARACTER(LEN=3) , PARAMETER :: dataset = "DS1" INTEGER , PARAMETER :: dim0 = 4 INTEGER(SIZE_T) , PARAMETER :: size = 7 INTEGER(HID_T) :: file, space, dtype, dset ! Handles INTEGER :: hdferr INTEGER(size_t) :: len INTEGER(hsize_t), DIMENSION(1:1) :: dims = (/DIM0/) CHARACTER(LEN=size), DIMENSION(1:dim0), TARGET :: wdata ! Write buffer CHARACTER(LEN=size), DIMENSION(:), ALLOCATABLE, TARGET :: rdata ! Read buffer CHARACTER(LEN=size-1) :: str = "OPAQUE" CHARACTER(LEN=80) :: tag INTEGER :: taglen INTEGER(HSIZE_T), DIMENSION(1:1) :: maxdims INTEGER :: i CHARACTER(LEN=1) :: ichr TYPE(C_PTR) :: f_ptr ! ! Initialize FORTRAN interface. ! CALL h5open_f(hdferr) ! ! Initialize data. ! DO i = 1, dim0 WRITE(ichr,'(I1)') i-1 wdata(i) = str//ichr ENDDO ! ! Create a new file using the default properties. ! CALL h5fcreate_f(filename, H5F_ACC_TRUNC_F, file, hdferr) ! ! Create opaque datatype and set the tag to something appropriate. ! For this example we will write and view the data as a character ! array. ! CALL h5tcreate_f(h5T_OPAQUE_F, size, dtype, hdferr) CALL h5tset_tag_f(dtype,"Character array",hdferr) ! ! Create dataspace. Setting maximum size to be the current size. ! CALL h5screate_simple_f(1, dims, space, hdferr) ! ! Create the dataset and write the opaque data to it. ! CALL h5dcreate_f(file, dataset, dtype, space, dset, hdferr) f_ptr = C_LOC(wdata(1)) CALL h5dwrite_f(dset, dtype, f_ptr, hdferr) ! ! Close and release resources. ! CALL H5Dclose_f(dset, hdferr) CALL H5Sclose_f(space, hdferr) CALL H5Tclose_f(dtype, 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 datatype and properties for the datatype. ! CALL h5dget_type_f(dset, dtype, hdferr) CALL h5tget_size_f(dtype, len, hdferr) CALL h5tget_tag_f(dtype, tag, taglen, 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, dtype, f_ptr, hdferr) ! ! Output the data to the screen. ! WRITE(*,'("Datatype tag for ",A," is: ",A)') dataset, '"'//tag(1:taglen)//'"' ! DO i = 1, dims(1) WRITE(*,'(A,"[",i1,"]: ",A)') dataset,i-1,rdata(i) ENDDO ! ! Close and release resources. ! DEALLOCATE(rdata) CALL H5Dclose_f(dset, hdferr) CALL H5Sclose_f(space, hdferr) CALL H5Tclose_f(dtype, hdferr) CALL H5Fclose_f(file, hdferr) ! END PROGRAM main