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Diffstat (limited to 'HDF5Examples/FORTRAN/H5D/h5ex_d_extern.F90')
| -rw-r--r-- | HDF5Examples/FORTRAN/H5D/h5ex_d_extern.F90 | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/HDF5Examples/FORTRAN/H5D/h5ex_d_extern.F90 b/HDF5Examples/FORTRAN/H5D/h5ex_d_extern.F90 new file mode 100644 index 0000000..faef397 --- /dev/null +++ b/HDF5Examples/FORTRAN/H5D/h5ex_d_extern.F90 @@ -0,0 +1,137 @@ +!************************************************************ +! +! 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 version 1.8 +! +! ************************************************************/ + +! An optional example for determining the correct HDF5 version +! for picking the correct HDF5 API parameters. This is not +! part of the HDF5 library. +#include "h5_version.h" + +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 + ! This change was introduced in the 1.8.12 release +#if H5_VERSION_GE(1,8,12) + INTEGER(OFF_T) :: offset = 0 ! Offset, in bytes, from thebeginning of the file to the + ! location in the file where the data starts. +#else + INTEGER :: offset = 0 +#endif + 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, offset, 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 |