!************************************************************ ! ! This example shows how to read and write data to an ! external dataset. The program first writes integers to an ! external dataset with dataspace dimensions of DIM0xDIM1, ! then closes the file. Next, it reopens the file, reads ! back the data, and outputs the name of the external data ! file and the data to the screen. ! ! This file is intended for use with HDF5 Library verion 1.8 ! ! ************************************************************/ PROGRAM main USE HDF5 IMPLICIT NONE CHARACTER(LEN=16), PARAMETER :: filename = "h5ex_d_extern.h5" CHARACTER(LEN=18), PARAMETER :: externalname = "h5ex_d_extern.data" CHARACTER(LEN=3) , PARAMETER :: dataset = "DS1" INTEGER , PARAMETER :: dim0 = 4 INTEGER , PARAMETER :: dim1 = 7 INTEGER(SIZE_T) , PARAMETER :: name_buf_size = 32 INTEGER :: hdferr INTEGER :: layout INTEGER(HID_T) :: file, space, dset, dcpl ! Handles INTEGER(HSIZE_T), DIMENSION(1:2) :: dims = (/dim0, dim1/) INTEGER(HSIZE_T), DIMENSION(1:2) :: start, stride, count, block INTEGER, DIMENSION(1:dim0, 1:dim1) :: wdata, & ! Write buffer rdata ! Read buffer CHARACTER(LEN=name_buf_size) :: name INTEGER :: i, j INTEGER :: offset ! Offset, in bytes, from thebeginning of the file to the ! location in the file where the data starts. INTEGER(HSIZE_T) :: bytes ! Number of bytes reserved in the file for the data INTEGER(SIZE_T) :: int_size ! size of integer ! ! Initialize FORTRAN interface. ! CALL h5open_f(hdferr) ! ! Initialize data. ! DO i = 1, dim0 DO j = 1, dim1 wdata(i,j) = (i-1)*(j-1)-(j-1) ENDDO ENDDO ! ! Create a new file using the default properties. ! CALL h5fcreate_f(filename, H5F_ACC_TRUNC_F, file, hdferr) ! ! Create dataspace. Setting maximum size to NULL sets the maximum ! size to be the current size. ! CALL h5screate_simple_f(2, dims, space, hdferr) ! ! Create the dataset creation property list, set the external ! file. ! CALL h5pcreate_f(H5P_DATASET_CREATE_F, dcpl, hdferr) ! for HDF5 versions <= 1.8.2 use: CALL h5tget_size_f(H5T_NATIVE_INTEGER, int_size, hdferr) bytes = int_size*dim0*dim1 ! else use: ! bytes = INT(H5F_UNLIMITED_F,HSIZE_T) CALL h5pset_external_f(dcpl, externalname, 0, bytes, hdferr) ! ! Create the external dataset. ! CALL h5dcreate_f(file, dataset, H5T_STD_I32LE, space, dset, hdferr, dcpl) ! ! Write the data to the dataset. ! CALL h5dwrite_f(dset, H5T_NATIVE_INTEGER, wdata, dims, hdferr) ! ! Close and release resources. ! CALL h5pclose_f(dcpl , hdferr) CALL h5dclose_f(dset , hdferr) CALL h5sclose_f(space, hdferr) CALL h5fclose_f(file , hdferr) ! ! Now we begin the read section of this example. ! ! ! Open file and dataset using the default properties. ! CALL h5fopen_f(filename, H5F_ACC_RDONLY_F, file, hdferr) CALL h5dopen_f(file, dataset, dset, hdferr) ! ! Retrieve dataset creation property list. ! CALL H5Dget_create_plist_f(dset, dcpl, hdferr) ! ! Retrieve and print the name of the external file. Here we ! manually set the last field in name to null, in case the name of ! the file is longer than the buffer. ! CALL H5Pget_external_f (dcpl, 0, name_buf_size, name, offset, bytes, hdferr) WRITE(*,'(A," is stored in file: ",A)') dataset, TRIM(name) ! ! Read the data using the default properties. ! CALL h5dread_f(dset, H5T_NATIVE_INTEGER, rdata, dims, hdferr) ! ! Output the data to the screen. ! WRITE(*, '(A,":")') dataset DO i=1, dim0 WRITE(*,'(" [")', ADVANCE='NO') WRITE(*,'(80i3)', ADVANCE='NO') rdata(i,:) WRITE(*,'(" ]")') ENDDO ! ! Close and release resources. ! CALL h5pclose_f(dcpl , hdferr) CALL h5dclose_f(dset , hdferr) CALL h5fclose_f(file , hdferr) END PROGRAM main