mirror of
https://github.com/HDFGroup/hdf5.git
synced 2024-11-21 01:04:10 +08:00
fef182fd96
Purpose:
Codemaintenance
Description:
read/write APIs have been changed.
Solution:
Made necessary changes to the source code.
Platforms tested:
Linux, Solaris 2.7, O2K, T3E
145 lines
5.4 KiB
Fortran
145 lines
5.4 KiB
Fortran
!
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! This program shows how to create and store references to the objects.
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! Program creates a file, two groups, a dataset to store integer data and
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! a dataset to store references to the objects.
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! Stored references are used to open the objects they are point to.
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! Data is written to the dereferenced dataset, and class type is displayed for
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! the shared datatype.
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!
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PROGRAM OBJ_REFERENCES
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USE HDF5 ! This module contains all necessary modules
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IMPLICIT NONE
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CHARACTER(LEN=10), PARAMETER :: filename = "FORTRAN.h5" ! File
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CHARACTER(LEN=8), PARAMETER :: dsetnamei = "INTEGERS" ! Dataset with the integer data
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CHARACTER(LEN=17), PARAMETER :: dsetnamer = "OBJECT_REFERENCES" ! Dataset wtih object
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! references
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CHARACTER(LEN=6), PARAMETER :: groupname1 = "GROUP1" ! Groups in the file
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CHARACTER(LEN=6), PARAMETER :: groupname2 = "GROUP2" !
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INTEGER(HID_T) :: file_id ! File identifier
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INTEGER(HID_T) :: grp1_id ! Group identifiers
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INTEGER(HID_T) :: grp2_id !
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INTEGER(HID_T) :: dset_id ! Dataset identifiers
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INTEGER(HID_T) :: dsetr_id !
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INTEGER(HID_T) :: type_id ! Type identifier
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INTEGER(HID_T) :: space_id ! Dataspace identifiers
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INTEGER(HID_T) :: spacer_id !
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INTEGER :: error
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INTEGER(HSIZE_T), DIMENSION(1) :: dims = (/5/)
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INTEGER(HSIZE_T), DIMENSION(1) :: dimsr= (/4/)
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INTEGER(HSIZE_T), DIMENSION(1) :: my_maxdims = (/5/)
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INTEGER :: rank = 1
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INTEGER :: rankr = 1
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TYPE(hobj_ref_t_f), DIMENSION(4) :: ref
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TYPE(hobj_ref_t_f), DIMENSION(4) :: ref_out
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INTEGER, DIMENSION(5) :: data = (/1, 2, 3, 4, 5/)
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INTEGER :: class
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INTEGER, DIMENSION(7) :: data_dims, ref_size
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!
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! Initialize FORTRAN interface.
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!
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CALL h5open_f(error)
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!
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! Create a file
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!
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CALL h5fcreate_f(filename, H5F_ACC_TRUNC_F, file_id, error)
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! Default file access and file creation
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! properties are used.
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!
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! Create a group in the file
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!
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CALL h5gcreate_f(file_id, groupname1, grp1_id, error)
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!
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! Create a group inside the created gorup
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!
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CALL h5gcreate_f(grp1_id, groupname2, grp2_id, error)
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!
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! Create dataspaces for datasets
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!
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CALL h5screate_simple_f(rank, dims, space_id, error, maxdims=my_maxdims)
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CALL h5screate_simple_f(rankr, dimsr, spacer_id, error)
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!
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! Create integer dataset
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!
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CALL h5dcreate_f(file_id, dsetnamei, H5T_NATIVE_INTEGER, space_id, &
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dset_id, error)
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!
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! Create dataset to store references to the objects
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!
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CALL h5dcreate_f(file_id, dsetnamer, H5T_STD_REF_OBJ, spacer_id, &
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dsetr_id, error)
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!
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! Create a datatype and store in the file
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!
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CALL h5tcopy_f(H5T_NATIVE_REAL, type_id, error)
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CALL h5tcommit_f(file_id, "MyType", type_id, error)
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!
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! Close dataspaces, groups and integer dataset
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!
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CALL h5sclose_f(space_id, error)
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CALL h5sclose_f(spacer_id, error)
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CALL h5tclose_f(type_id, error)
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CALL h5dclose_f(dset_id, error)
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CALL h5gclose_f(grp1_id, error)
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CALL h5gclose_f(grp2_id, error)
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!
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! Create references to two groups, integer dataset and shared datatype
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! and write it to the dataset in the file
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!
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CALL h5rcreate_f(file_id, groupname1, ref(1), error)
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CALL h5rcreate_f(file_id, "/GROUP1/GROUP2", ref(2), error)
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CALL h5rcreate_f(file_id, dsetnamei, ref(3), error)
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CALL h5rcreate_f(file_id, "MyType", ref(4), error)
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ref_size(1) = size(ref)
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CALL h5dwrite_f(dsetr_id, H5T_STD_REF_OBJ, ref, ref_size, error)
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!
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! Close the dataset
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!
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CALL h5dclose_f(dsetr_id, error)
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!
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! Reopen the dataset with object references and read references to the buffer
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!
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CALL h5dopen_f(file_id, dsetnamer,dsetr_id,error)
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ref_size(1) = size(ref_out)
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CALL h5dread_f(dsetr_id, H5T_STD_REF_OBJ, ref_out, ref_size, error)
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!
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! Dereference the third reference. We know that it is a dataset. On practice
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! one should use h5rget_object_type_f function to find out
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! the type of an object the reference points to.
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!
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CALL h5rdereference_f(dsetr_id, ref(3), dset_id, error)
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!
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! Write data to the dataset.
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!
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data_dims(1) = size(data)
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CALL h5dwrite_f(dset_id, H5T_NATIVE_INTEGER, data, data_dims, error)
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if (error .eq. 0) write(*,*) "Data has been successfully written to the dataset "
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!
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! Dereference the fourth reference. We know that it is a datatype. On practice
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! one should use h5rget_object_type_f function to find out
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! the type of an object the reference points to.
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!
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CALL h5rdereference_f(dsetr_id, ref(4), type_id, error)
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!
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! Get datatype class and display it if it is of a FLOAT class.
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!
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CALL h5tget_class_f(type_id, class, error)
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if(class .eq. H5T_FLOAT_F) write(*,*) "Stored datatype is of a FLOAT class"
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!
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! Close all objects.
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!
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CALL h5dclose_f(dset_id, error)
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CALL h5tclose_f(type_id, error)
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CALL h5dclose_f(dsetr_id, error)
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CALL h5fclose_f(file_id, error)
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!
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! Close FORTRAN interface.
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!
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CALL h5close_f(error)
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END PROGRAM OBJ_REFERENCES
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