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!
! This program creates a dataset that is one dimensional array of
! structures {
! character*2
! integer
! double precision
! real
! }
! Data is written and read back by fields.
!
PROGRAM COMPOUNDEXAMPLE
USE HDF5 ! This module contains all necessary modules
IMPLICIT NONE
CHARACTER(LEN=11), PARAMETER :: filename = "compound.h5" ! File name
CHARACTER(LEN=8), PARAMETER :: dsetname = "Compound" ! Dataset name
INTEGER, PARAMETER :: dimsize = 6 ! Size of the dataset
INTEGER(HID_T) :: file_id ! File identifier
INTEGER(HID_T) :: dset_id ! Dataset identifier
INTEGER(HID_T) :: dspace_id ! Dataspace identifier
INTEGER(HID_T) :: dtype_id ! Compound datatype identifier
INTEGER(HID_T) :: dt1_id ! Memory datatype identifier (for character field)
INTEGER(HID_T) :: dt2_id ! Memory datatype identifier (for integer field)
INTEGER(HID_T) :: dt3_id ! Memory datatype identifier (for double precision field)
INTEGER(HID_T) :: dt4_id ! Memory datatype identifier (for real field)
INTEGER(HID_T) :: dt5_id ! Memory datatype identifier
INTEGER(HID_T) :: plist_id ! Dataset trasfer property
INTEGER(SIZE_T) :: typesize
INTEGER(HSIZE_T), DIMENSION(1) :: dims = (/dimsize/) ! Dataset dimensions
INTEGER :: rank = 1 ! Dataset rank
INTEGER :: error ! Error flag
INTEGER(SIZE_T) :: type_size ! Size of the datatype
INTEGER(SIZE_T) :: type_sizec ! Size of the character datatype
INTEGER(SIZE_T) :: type_sizei ! Size of the integer datatype
INTEGER(SIZE_T) :: type_sized ! Size of the double precision datatype
INTEGER(SIZE_T) :: type_sizer ! Size of the real datatype
INTEGER(SIZE_T) :: offset ! Member's offset
CHARACTER*2, DIMENSION(dimsize) :: char_member
CHARACTER*2, DIMENSION(dimsize) :: char_member_out ! Buffer to read data out
INTEGER, DIMENSION(dimsize) :: int_member
DOUBLE PRECISION, DIMENSION(dimsize) :: double_member
REAL, DIMENSION(dimsize) :: real_member
INTEGER :: i
!
! Initialize data buffer.
!
do i = 1, dimsize
char_member(i)(1:1) = char(65+i)
char_member(i)(2:2) = char(65+i)
char_member_out(i)(1:1) = char(65)
char_member_out(i)(2:2) = char(65)
int_member(i) = i
double_member(i) = 2.* i
real_member(i) = 3. * i
enddo
!
! Initialize FORTRAN interface.
!
CALL h5init_fortran_f(error)
!
! Set dataset transfer property to preserve partially initialized fields
! during write/read to/from dataset with compound datatype.
!
CALL h5pcreate_f(H5P_DATASET_XFER_F, plist_id, error)
CALL h5pset_preserve_f(plist_id, 1, error)
!
! Create a new file using default properties.
!
CALL h5fcreate_f(filename, H5F_ACC_TRUNC_F, file_id, error)
!
! Create the dataspace.
!
CALL h5screate_simple_f(rank, dims, dspace_id, error)
!
! Create compound datatype.
!
! First calculate total size by calculating sizes of each member
!
CALL h5tcopy_f(H5T_NATIVE_CHARACTER, dt5_id, error)
typesize = 2
CALL h5tset_size_f(dt5_id, typesize, error)
CALL h5tget_size_f(dt5_id, type_sizec, error)
CALL h5tget_size_f(H5T_NATIVE_INTEGER, type_sizei, error)
CALL h5tget_size_f(H5T_NATIVE_DOUBLE, type_sized, error)
CALL h5tget_size_f(H5T_NATIVE_REAL, type_sizer, error)
type_size = type_sizec + type_sizei + type_sized + type_sizer
CALL h5tcreate_f(H5T_COMPOUND_F, type_size, dtype_id, error)
!
! Insert memebers
!
! CHARACTER*2 memeber
!
offset = 0
CALL h5tinsert_f(dtype_id, "char_field", offset, dt5_id, error)
!
! INTEGER member
!
offset = offset + type_sizec ! Offset of the second memeber is 2
CALL h5tinsert_f(dtype_id, "integer_field", offset, H5T_NATIVE_INTEGER, error)
!
! DOUBLE PRECISION member
!
offset = offset + type_sizei ! Offset of the third memeber is 6
CALL h5tinsert_f(dtype_id, "double_field", offset, H5T_NATIVE_DOUBLE, error)
!
! REAL member
!
offset = offset + type_sized ! Offset of the last member is 14
CALL h5tinsert_f(dtype_id, "real_field", offset, H5T_NATIVE_REAL, error)
!
! Create the dataset with compound datatype.
!
CALL h5dcreate_f(file_id, dsetname, dtype_id, dspace_id, &
dset_id, error)
!
! Create memory types. We have to create a compound datatype
! for each member we want to write.
!
CALL h5tcreate_f(H5T_COMPOUND_F, type_sizec, dt1_id, error)
offset = 0
CALL h5tinsert_f(dt1_id, "char_field", offset, dt5_id, error)
!
CALL h5tcreate_f(H5T_COMPOUND_F, type_sizei, dt2_id, error)
offset = 0
CALL h5tinsert_f(dt2_id, "integer_field", offset, H5T_NATIVE_INTEGER, error)
!
CALL h5tcreate_f(H5T_COMPOUND_F, type_sized, dt3_id, error)
offset = 0
CALL h5tinsert_f(dt3_id, "double_field", offset, H5T_NATIVE_DOUBLE, error)
!
CALL h5tcreate_f(H5T_COMPOUND_F, type_sizer, dt4_id, error)
offset = 0
CALL h5tinsert_f(dt4_id, "real_field", offset, H5T_NATIVE_REAL, error)
!
! Write data by fields in the datatype. Fields order is not important.
!
CALL h5dwrite_f(dset_id, dt4_id, real_member, error, xfer_prp = plist_id)
CALL h5dwrite_f(dset_id, dt1_id, char_member, error, xfer_prp = plist_id)
CALL h5dwrite_f(dset_id, dt3_id, double_member, error, xfer_prp = plist_id)
CALL h5dwrite_f(dset_id, dt2_id, int_member, error, xfer_prp = plist_id)
!
! End access to the dataset and release resources used by it.
!
CALL h5dclose_f(dset_id, error)
!
! Terminate access to the data space.
!
CALL h5sclose_f(dspace_id, error)
!
! Terminate access to the datatype
!
CALL h5tclose_f(dtype_id, error)
CALL h5tclose_f(dt1_id, error)
CALL h5tclose_f(dt2_id, error)
CALL h5tclose_f(dt3_id, error)
CALL h5tclose_f(dt4_id, error)
CALL h5tclose_f(dt5_id, error)
!
! Close the file.
!
CALL h5fclose_f(file_id, error)
!
! Open the file.
!
CALL h5fopen_f (filename, H5F_ACC_RDWR_F, file_id, error)
!
! Open the dataset.
!
CALL h5dopen_f(file_id, dsetname, dset_id, error)
!
! Create memeory datatyoe to read character member of the compound datatype.
!
CALL h5tcopy_f(H5T_NATIVE_CHARACTER, dt2_id, error)
typesize = 2
CALL h5tset_size_f(dt2_id, typesize, error)
CALL h5tget_size_f(dt2_id, type_size, error)
CALL h5tcreate_f(H5T_COMPOUND_F, type_size, dt1_id, error)
offset = 0
CALL h5tinsert_f(dt1_id, "char_field", offset, dt2_id, error)
!
! Read part of the datatset and display it.
!
CALL h5dread_f(dset_id, dt1_id, char_member_out, error)
write(*,*) (char_member_out(i), i=1, dimsize)
!
! Close all open objects.
!
CALL h5dclose_f(dset_id, error)
CALL h5tclose_f(dt1_id, error)
CALL h5tclose_f(dt2_id, error)
CALL h5fclose_f(file_id, error)
!
! Close FORTRAN interface.
!
CALL h5close_fortran_f(error)
END PROGRAM COMPOUNDEXAMPLE
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