diff options
Diffstat (limited to 'HDF5Examples/FORTRAN/H5T/h5ex_t_objrefatt_F03.F90')
| -rw-r--r-- | HDF5Examples/FORTRAN/H5T/h5ex_t_objrefatt_F03.F90 | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/HDF5Examples/FORTRAN/H5T/h5ex_t_objrefatt_F03.F90 b/HDF5Examples/FORTRAN/H5T/h5ex_t_objrefatt_F03.F90 new file mode 100644 index 0000000..3a1ec79 --- /dev/null +++ b/HDF5Examples/FORTRAN/H5T/h5ex_t_objrefatt_F03.F90 @@ -0,0 +1,151 @@ +!************************************************************ +! +! This example shows how to read and write object references +! to an attribute. The program first creates objects in the +! file and writes references to those objects to an +! attribute with a dataspace of DIM0, then closes the file. +! Next, it reopens the file, dereferences the references, +! and outputs the names of their targets 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 + CHARACTER(LEN=23), PARAMETER :: filename = "h5ex_t_objrefatt_F03.h5" + CHARACTER(LEN=3) , PARAMETER :: dataset = "DS1" + CHARACTER(LEN=2) , PARAMETER :: attribute = "A1" + INTEGER , PARAMETER :: dim0 = 2 + + INTEGER(HID_T) :: file, space, dset, obj, attr ! Handles + INTEGER :: hdferr + INTEGER(hsize_t), DIMENSION(1:1) :: dims = (/DIM0/) + TYPE(hobj_ref_t_f), DIMENSION(1:dim0), TARGET :: wdata ! Write buffer + TYPE(hobj_ref_t_f), DIMENSION(:), ALLOCATABLE, TARGET :: rdata ! Read buffer + INTEGER :: objtype + INTEGER(SIZE_T) :: name_size + CHARACTER(LEN=80) :: name + INTEGER(HSIZE_T), DIMENSION(1:1) :: maxdims + INTEGER :: i + TYPE(C_PTR) :: f_ptr + ! + ! Initialize FORTRAN interface. + ! + CALL h5open_f(hdferr) + ! + ! Create a new file using the default properties. + ! + CALL h5fcreate_f(filename, H5F_ACC_TRUNC_F, file, hdferr) + ! + ! Create a dataset with a null dataspace. + ! + CALL h5screate_f(H5S_NULL_F,space,hdferr) + CALL h5dcreate_f(file, "DS2", H5T_STD_I32LE, space, obj, hdferr) + ! + CALL h5dclose_f(obj , hdferr) + CALL h5sclose_f(space, hdferr) + ! + ! Create a group. + ! + CALL h5gcreate_f(file, "G1", obj, hdferr) + CALL h5gclose_f(obj, hdferr) + ! + ! Create references to the previously created objects. note, space_id + ! is not needed for object references. + ! + f_ptr = C_LOC(wdata(1)) + CALL H5Rcreate_f(file, "G1", H5R_OBJECT_F, f_ptr, hdferr) + f_ptr = C_LOC(wdata(2)) + CALL H5Rcreate_f(file, "DS2", H5R_OBJECT_F, f_ptr, hdferr) + ! + ! Create dataset with a null dataspace to serve as the parent for + ! the attribute. + ! + 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(1, dims, space, hdferr) + ! + ! Create the attribute and write the object references to it. + ! + CALL H5Acreate_f(dset, attribute, H5T_STD_REF_OBJ, space, attr, hdferr) + f_ptr = C_LOC(wdata(1)) + CALL H5Awrite_f(attr, H5T_STD_REF_OBJ, f_ptr, hdferr) + ! + ! Close and release resources. + ! + CALL H5Aclose_f(attr, 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. + ! + 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:maxdims(1))) + ! + ! Read the data. + ! + f_ptr = C_LOC(rdata(1)) + CALL h5aread_f(attr, H5T_STD_REF_OBJ, f_ptr, hdferr) + ! + ! Output the data to the screen. + ! + DO i = 1, maxdims(1) + WRITE(*,'(A,"[",i1,"]:",/,2X,"->")', ADVANCE='NO') attribute, i-1 + ! + ! Open the referenced object, get its name and type. + ! + f_ptr = C_LOC(rdata(i)) + CALL H5Rdereference_f(dset, H5R_OBJECT_F, f_ptr, obj, hdferr) + CALL H5Rget_obj_type_f(dset, H5R_OBJECT_F, f_ptr, objtype, hdferr) + ! + ! Get the length of the name and name + ! + CALL H5Iget_name_f(obj, name, 80_size_t, name_size, hdferr) + ! + ! Print the object type and close the object. + ! + IF(objtype.EQ.H5G_GROUP_F)THEN + WRITE(*,'("Group")', ADVANCE="NO") + ELSE IF(objtype.EQ.H5G_DATASET_F)THEN + WRITE(*,'("Dataset")', ADVANCE="NO") + ELSE IF(objtype.EQ.H5G_TYPE_F)THEN + WRITE(*,'("Named Datatype")', ADVANCE="NO") + ELSE + WRITE(*,'("Unknown")', ADVANCE="NO") + ENDIF + CALL h5oclose_f(obj, hdferr) + ! + ! Print the name. + ! + WRITE(*,'(": ",A)') name(1:name_size) + END DO + ! + ! 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 |