!************************************************************ ! ! This example shows how to read and write floating point ! datatypes to an attribute. The program first writes ! floating point numbers to an attribute with a dataspace of ! DIM0xDIM1, 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 ! This should map to REAL*8 on most modern processors INTEGER, PARAMETER :: real_kind_15 = SELECTED_REAL_KIND(15,307) CHARACTER(LEN=22), PARAMETER :: filename = "h5ex_t_floatatt_F03.h5" CHARACTER(LEN=3) , PARAMETER :: dataset = "DS1" CHARACTER(LEN=2) , PARAMETER :: attribute = "A1" INTEGER , PARAMETER :: dim0 = 4 INTEGER , PARAMETER :: dim1 = 7 INTEGER(HID_T) :: file, space, dset, attr ! Handles INTEGER :: hdferr INTEGER(hsize_t), DIMENSION(1:2) :: dims = (/dim0, dim1/) REAL(KIND=real_kind_15), DIMENSION(1:dim0, 1:dim1), TARGET :: wdata ! Write buffer REAL(KIND=real_kind_15), DIMENSION(:,:), ALLOCATABLE, TARGET :: rdata ! Read buffer INTEGER(HSIZE_T), DIMENSION(1:2) :: maxdims INTEGER :: i, j TYPE(C_PTR) :: f_ptr ! ! Initialize FORTRAN interface. ! CALL h5open_f(hdferr) ! ! Initialize DATA. ! DO i = 1, dim0 DO j = 1, dim1 wdata(i,j) = REAL(i-1,real_kind_15) / ( REAL(j-1,real_kind_15)+0.5_real_kind_15) + j-1 ENDDO ENDDO ! ! Create a new file using the default properties. ! CALL h5fcreate_f(filename, H5F_ACC_TRUNC_F, file, hdferr) ! ! Create dataspace 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. Setting maximum size to be the current size. ! CALL h5screate_simple_f(2, dims, space, hdferr) ! ! Create the attribute and write the floating point data to it. ! In this example we will save the data as 64 bit little endian ! IEEE floating point numbers, regardless of the native type. The ! HDF5 library automatically converts between different floating ! point types. ! CALL H5Acreate_f(dset, attribute, H5T_IEEE_F64LE, space, attr, hdferr) f_ptr = C_LOC(wdata(1,1)) CALL H5Awrite_f(attr, H5T_NATIVE_DOUBLE, f_ptr, hdferr) ! ! Close and release resources. ! CALL H5Aclose_f(attr, hdferr) CALL H5Dclose_f(dset, hdferr) CALL H5Fclose_f(file, hdferr) ! ! Now we begin the read section of this example. ! ! Open file and dataset, and attribute. ! 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 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),1:dims(2))) ! ! Read the data. ! f_ptr = C_LOC(rdata(1,1)) CALL h5aread_f( attr, H5T_NATIVE_DOUBLE, f_ptr, hdferr) ! ! Output the data to the screen. ! WRITE(*, '(A,":")') attribute DO i=1, dims(1) WRITE(*,'(" [")', ADVANCE='NO') WRITE(*,'(80(" ",f9.4))', ADVANCE='NO') rdata(i,1:dims(2)) WRITE(*,'(" ]")') ENDDO ! ! Close and release resources. ! DEALLOCATE(rdata) CALL h5aclose_f(attr , hdferr) CALL h5dclose_f(dset , hdferr) CALL h5sclose_f(space, hdferr) CALL h5fclose_f(file , hdferr) END PROGRAM main