diff options
Diffstat (limited to 'HDF5Examples/FORTRAN/H5T/h5ex_t_opaqueatt_F03.F90')
-rw-r--r-- | HDF5Examples/FORTRAN/H5T/h5ex_t_opaqueatt_F03.F90 | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/HDF5Examples/FORTRAN/H5T/h5ex_t_opaqueatt_F03.F90 b/HDF5Examples/FORTRAN/H5T/h5ex_t_opaqueatt_F03.F90 new file mode 100644 index 0000000..6de6ed7 --- /dev/null +++ b/HDF5Examples/FORTRAN/H5T/h5ex_t_opaqueatt_F03.F90 @@ -0,0 +1,128 @@ +!************************************************************ +! +! This example shows how to read and write opaque datatypes +! to an attribute. The program first writes opaque data to +! an attribute with a dataspace of DIM0, 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 + CHARACTER(LEN=23), PARAMETER :: filename = "h5ex_t_opaqueatt_F03.h5" + CHARACTER(LEN=3) , PARAMETER :: dataset = "DS1" + CHARACTER(LEN=2) , PARAMETER :: attribute = "A1" + INTEGER , PARAMETER :: dim0 = 4 + INTEGER(SIZE_T) , PARAMETER :: size = 7 + INTEGER(HID_T) :: file, space, dtype, dset, attr ! Handles + INTEGER :: hdferr + INTEGER(size_t) :: len + INTEGER(hsize_t), DIMENSION(1:1) :: dims = (/DIM0/) + + CHARACTER(LEN=size), DIMENSION(1:dim0), TARGET :: wdata ! Write buffer + CHARACTER(LEN=size), DIMENSION(:), ALLOCATABLE, TARGET :: rdata ! Read buffer + CHARACTER(LEN=size-1) :: str = "OPAQUE" + CHARACTER(LEN=80) :: tag + INTEGER :: taglen + INTEGER(HSIZE_T), DIMENSION(1:1) :: maxdims + INTEGER :: i + CHARACTER(LEN=1) :: ichr + TYPE(C_PTR) :: f_ptr + ! + ! Initialize FORTRAN interface. + ! + CALL h5open_f(hdferr) + ! + ! Initialize data. + ! + DO i = 1, dim0 + WRITE(ichr,'(I1)') i-1 + wdata(i) = str//ichr + ENDDO + ! + ! Create a new file using the default properties. + ! + CALL h5fcreate_f(filename, H5F_ACC_TRUNC_F, file, hdferr) + ! + ! Create dataset 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 opaque datatype and set the tag to something appropriate. + ! For this example we will write and view the data as a character + ! array. + ! + CALL h5tcreate_f(h5T_OPAQUE_F, size, dtype, hdferr) + CALL h5tset_tag_f(dtype,"Character array",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 opaque data to it. + ! + CALL H5Acreate_f(dset, attribute, dtype, space, attr, hdferr) + f_ptr = C_LOC(wdata(1)(1:1)) + CALL H5Awrite_f(attr, dtype, f_ptr, hdferr) + ! + ! Close and release resources. + ! + CALL H5Aclose_f(attr, hdferr) + CALL H5Dclose_f(dset, hdferr) + CALL H5Sclose_f(space, hdferr) + CALL H5Tclose_f(dtype, 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 datatype and properties for the datatype. + ! + CALL h5aget_type_f(attr, dtype, hdferr) + CALL h5tget_size_f(dtype, len, hdferr) + CALL h5tget_tag_f(dtype, tag, taglen, 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))) + ! + ! Read the data. + ! + f_ptr = C_LOC(rdata(1)(1:1)) + CALL h5aread_f(attr, dtype, f_ptr, hdferr) + ! + ! Output the data to the screen. + ! + WRITE(*,'("Datatype tag for ",A," is: ",A)') ATTRIBUTE, '"'//tag(1:taglen)//'"' + + DO i = 1, dims(1) + WRITE(*,'(A,"[",i1,"]: ",A)') attribute,i-1,rdata(i) + ENDDO + ! + ! Close and release resources. + ! + DEALLOCATE(rdata) + CALL H5Aclose_f(attr, hdferr) + CALL H5Dclose_f(dset, hdferr) + CALL H5Sclose_f(space, hdferr) + CALL H5Tclose_f(dtype, hdferr) + CALL H5Fclose_f(file, hdferr) + +END PROGRAM main |