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134 lines
4.0 KiB
Fortran
134 lines
4.0 KiB
Fortran
!************************************************************
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!
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! This example shows how to read and write data to a dataset
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! using a data transform expression. The program first
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! writes integers to a dataset using the transform
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! expression TRANSFORM, then closes the file. Next, it
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! reopens the file, reads back the data without a transform,
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! and outputs the data to the screen. Finally it reads the
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! data using the transform expression RTRANSFORM and outputs
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! the results to the screen.
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!
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! This file is intended for use with HDF5 Library version 1.8
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!
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!************************************************************
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PROGRAM main
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USE HDF5
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IMPLICIT NONE
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CHARACTER(LEN=19), PARAMETER :: filename = "h5ex_d_transform.h5"
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CHARACTER(LEN=3) , PARAMETER :: dataset = "DS1"
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INTEGER , PARAMETER :: dim0 = 4
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INTEGER , PARAMETER :: dim1 = 7
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CHARACTER(LEN=3) , PARAMETER :: transform = "x+1"
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CHARACTER(LEN=3) , PARAMETER :: rtransform = "x-1"
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INTEGER(HID_T) :: file, space, dset, dxpl ! Handles
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INTEGER :: hdferr
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INTEGER(HSIZE_T), DIMENSION(1:2) :: dims = (/dim0, dim1/)
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INTEGER, DIMENSION(1:dim0, 1:dim1) :: wdata, & ! Write buffer
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rdata ! Read buffer
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INTEGER :: i, j
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!
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! Initialize FORTRAN interface.
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!
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CALL h5open_f(hdferr)
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!
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! Initialize data.
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!
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DO i = 1, dim0
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DO j = 1, dim1
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wdata(i,j) = (i-2)*(j-1)
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ENDDO
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ENDDO
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!
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! Output the data to the screen.
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!
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WRITE(*, '("Original Data:")')
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DO i=1, dim0
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WRITE(*,'(" [")', ADVANCE='NO')
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WRITE(*,'(80i3)', ADVANCE='NO') wdata(i,:)
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WRITE(*,'(" ]")')
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ENDDO
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!
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! Create a new file using the default properties.
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!
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CALL h5fcreate_f(filename, H5F_ACC_TRUNC_F, file, hdferr)
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!
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! Create dataspace. Setting maximum size to NULL sets the maximum
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! size to be the current size.
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!
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CALL h5screate_simple_f(2, dims, space, hdferr)
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!
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! Create the dataset transfer property list and define the
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! transform expression.
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!
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CALL h5pcreate_f(H5P_DATASET_XFER_F, dxpl, hdferr)
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CALL h5pset_data_transform_f (dxpl, transform, hdferr)
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!
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! Create the dataset using the default properties. Unfortunately
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! we must save as a native type or the transform operation will
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! fail.
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!
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CALL h5dcreate_f(file, dataset, H5T_NATIVE_INTEGER, space, dset, hdferr)
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!
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! Write the data to the dataset using the dataset transfer
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! property list.
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!
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CALL h5dwrite_f(dset, H5T_NATIVE_INTEGER, wdata, dims, hdferr,xfer_prp=dxpl)
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!
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! Close and release resources.
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!
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CALL h5pclose_f(dxpl , hdferr)
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CALL h5dclose_f(dset , hdferr)
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CALL h5sclose_f(space, hdferr)
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CALL h5fclose_f(file , hdferr)
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!
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! Now we begin the read section of this example.
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!
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CALL h5fopen_f(filename, H5F_ACC_RDONLY_F, file, hdferr)
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CALL h5dopen_f (file, dataset, dset, hdferr)
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!
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! Read the data using the default properties.
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!
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CALL h5dread_f(dset, H5T_NATIVE_INTEGER, rdata, dims, hdferr)
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!
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! Output the data to the screen.
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!
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WRITE(*, '(/,"Data as written with transform ",A,":")') transform
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DO i=1, dim0
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WRITE(*,'(" [")', ADVANCE='NO')
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WRITE(*,'(80i3)', ADVANCE='NO') rdata(i,:)
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WRITE(*,'(" ]")')
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ENDDO
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!
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! Create the dataset transfer property list and define the
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! transform expression.
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!
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CALL h5pcreate_f(H5P_DATASET_XFER_F, dxpl, hdferr)
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CALL h5pset_data_transform_f (dxpl, rtransform, hdferr)
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!
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! Read the data using the dataset transfer property list.
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!
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CALL h5dread_f(dset, H5T_NATIVE_INTEGER, rdata, dims, hdferr,xfer_prp=dxpl)
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!
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! Output the data to the screen.
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!
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WRITE(*, '(/,"Data as written with transform ",A," and read with transform ",A,":")') &
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transform, rtransform
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DO i=1, dim0
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WRITE(*,'(" [")', ADVANCE='NO')
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WRITE(*,'(80i3)', ADVANCE='NO') rdata(i,:)
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WRITE(*,'(" ]")')
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ENDDO
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!
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! Close and release resources.
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!
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CALL h5pclose_f(dxpl , hdferr)
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CALL h5dclose_f(dset , hdferr)
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CALL h5fclose_f(file , hdferr)
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END PROGRAM main
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