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# set.f90

How to set values through the key names.

    00001 ! Copyright 2005-2018 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 set key values.
    00010 !
    00011 !
    00012 !  Author: Anne Fouilloux
    00013 !
    00014 !
    00015 program set
    00016   use grib_api
    00017   implicit none
    00018   integer(kind = 4)    :: centre, date
    00019   integer              :: infile,outfile
    00020   integer              :: igrib
    00021
    00022
    00023   centre = 80
    00024   call current_date(date)
    00025   call grib_open_file(infile, &
    00026        '../../data/regular_latlon_surface_constant.grib1','r')
    00027
    00028   call grib_open_file(outfile, &
    00029        'out.grib1','w')
    00030
    00031   !     a new grib message is loaded from file
    00032   !     igrib is the grib id to be used in subsequent calls
    00033   call grib_new_from_file(infile,igrib)
    00034
    00035   call grib_set(igrib,'date',date)
    00036   !     set centre as a integer */
    00037   call grib_set(igrib,'centre',centre)
    00038
    00039 ! check if it is correct in the actual GRIB message
    00040
    00041   call check_settings(igrib)
    00042
    00043   !     write modified message to a file
    00044   call grib_write(igrib,outfile)
    00045
    00046   call grib_release(igrib)
    00047
    00048   call grib_close_file(infile)
    00049
    00050   call grib_close_file(outfile)
    00051
    00052 contains
    00053
    00054 !======================================
    00055 subroutine current_date(date)
    00056 integer, intent(out) :: date
    00057
    00058 integer              :: val_date(8)
    00059 call date_and_time ( values = val_date)
    00060
    00061 date = val_date(1)* 10000 + val_date(2)*100 + val_date(3)
    00062 end subroutine current_date
    00063 !======================================
    00064 subroutine check_settings(gribid)
    00065   use grib_api
    00066   implicit none
    00067   integer, intent(in) :: gribid
    00068
    00069   integer(kind = 4)    :: int_value
    00070   character(len = 10)  :: string_value
    00071
    00072   !     get centre as a integer
    00073   call grib_get(gribid,'centre',int_value)
    00074   write(*,*) "get centre as a integer - centre = ",int_value
    00075
    00076   !     get centre as a string
    00077   call grib_get(gribid,'centre',string_value)
    00078   write(*,*) "get centre as a string  - centre = ",string_value
    00079
    00080   !     get date as a string
    00081   call grib_get(gribid,'dataDate',string_value)
    00082   write(*,*) "get date as a string    - date = ",string_value
    00083
    00084 end subroutine check_settings
    00085 end program set