Description
This example shows: how to get message lengths using two different interfaces.
Source code
grib_read_from_file.f90
! (C) Copyright 2005- ECMWF. ! ! This software is licensed under the terms of the Apache Licence Version 2.0 ! which can be obtained at http://www.apache.org/licenses/LICENSE-2.0. ! ! In applying this licence, ECMWF does not waive the privileges and immunities granted to it by ! virtue of its status as an intergovernmental organisation nor does it submit to any jurisdiction. ! ! Get message lengths using two different interfaces ! ! program grib_read_from_file use eccodes implicit none character(len=32) :: input_grib_file integer, dimension(26) :: message_lengths ! expected message lengths input_grib_file = '../../data/v.grib2' message_lengths = (/95917, 96963, 97308, 97386, 97215, 97440, 98451, 98629, 98448, & 99186, 97517, 97466, 99307, 98460, 101491, 99361, 100292, 96838, & 91093, 83247, 78244, 74872, 72663, 69305, 69881, 68572/) ! Get the GRIB message length using two different interfaces call read_using_size_t() call read_using_integer() print *, 'Passed' contains !====================================== subroutine read_using_size_t implicit none integer :: size, intsize parameter(intsize=100000, size=intsize*4) integer :: ifile integer :: iret integer :: count1 = 0 integer(kind=4), dimension(intsize) :: buffer integer(kind=kindOfSize_t) :: len1 ! For large messages character(len=128) :: error_message ifile = 5 call codes_open_file(ifile, input_grib_file, 'r') len1 = size call codes_read_from_file(ifile, buffer, len1, iret) do while (iret == CODES_SUCCESS) count1 = count1 + 1 if (len1 /= message_lengths(count1)) then write (*, '(a,i3,a,i8,a,i8)') 'Error: Message #', count1, ' length=', len1, '. Expected=', message_lengths(count1) stop end if len1 = size call codes_read_from_file(ifile, buffer, len1, iret) end do if (iret /= CODES_END_OF_FILE) then call codes_get_error_string(iret, error_message) write (*, *) 'error message: ', error_message call codes_check(iret, 'grib_read_from_file', '') end if call codes_close_file(ifile) end subroutine read_using_size_t !====================================== subroutine read_using_integer implicit none integer :: size, intsize parameter(intsize=100000, size=intsize*4) integer :: ifile integer :: iret integer :: count1 = 0 integer(kind=4), dimension(intsize) :: buffer integer :: len1 character(len=128) :: error_message ifile = 5 call codes_open_file(ifile, input_grib_file, 'r') len1 = size call codes_read_from_file(ifile, buffer, len1, iret) do while (iret == CODES_SUCCESS) count1 = count1 + 1 if (len1 /= message_lengths(count1)) then write (*, '(a,i3,a,i8,a,i8)') 'Error: Message #', count1, ' length=', len1, '. Expected=', message_lengths(count1) stop end if len1 = size call codes_read_from_file(ifile, buffer, len1, iret) end do if (iret /= CODES_END_OF_FILE) then call codes_get_error_string(iret, error_message) write (*, *) 'error message: ', error_message call codes_check(iret, 'grib_read_from_file', '') end if call codes_close_file(ifile) end subroutine read_using_integer !====================================== end program