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Diffstat (limited to 'HDF5Examples/FORTRAN/H5T/h5ex_t_floatatt_F03.F90')
-rw-r--r-- | HDF5Examples/FORTRAN/H5T/h5ex_t_floatatt_F03.F90 | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/HDF5Examples/FORTRAN/H5T/h5ex_t_floatatt_F03.F90 b/HDF5Examples/FORTRAN/H5T/h5ex_t_floatatt_F03.F90 new file mode 100644 index 0000000..63767ae --- /dev/null +++ b/HDF5Examples/FORTRAN/H5T/h5ex_t_floatatt_F03.F90 @@ -0,0 +1,116 @@ +!************************************************************ +! +! 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 |