grib_api: multi.f90

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# multi.f90

How to decode a grib message containing many fields.

    00001 ! Copyright 2005-2016 ECMWF
    00002 ! This software is licensed under the terms of the Apache Licence Version 2.0
    00003 ! which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
    00004 !
    00005 ! In applying this licence, ECMWF does not waive the privileges and immunities granted to it by
    00006 ! virtue of its status as an intergovernmental organisation nor does it submit to any jurisdiction.
    00007 !
    00008 !
    00009 !  Description: How to decode grib messages containing multiple
    00010 !               fields. Try to turn on and off multi support to
    00011 !               see the difference. Default is OFF.
    00012 !               For all the tools defalut is multi support ON.
    00013 !
    00014 !
    00015 !  Author: Enrico Fucile
    00016 !
    00017 !
    00018 program multi
    00019   use grib_api
    00020   implicit none
    00021
    00022   integer              :: iret
    00023   character(len = 256) :: error
    00024   integer(kind = 4)    :: step
    00025   integer              :: ifile,igrib
    00026
    00027   call grib_open_file(ifile, '../../data/multi_created.grib2','r')
    00028
    00029   !     turn on support for multi fields messages */
    00030   call grib_multi_support_on()
    00031
    00032   !     turn off support for multi fields messages */
    00033   !call grib_multi_support_off()
    00034
    00035   call grib_new_from_file(ifile,igrib, iret)
    00036   !     Loop on all the messages in a file.
    00037
    00038   write(*,*) 'step'
    00039   do while (iret /= GRIB_END_OF_FILE)
    00040
    00041      call grib_get(igrib,'step', step)
    00042      write(*,'(i3)') step
    00043
    00044      call grib_new_from_file(ifile,igrib, iret)
    00045
    00046   end do
    00047   call grib_close_file(ifile)
    00048
    00049 end program multi
    00050