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# copy_message.f90

How to copy a message in memory and create a new message.

    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 copy a message in memory
    00010 !
    00011 !
    00012 !  Author: Anne Fouilloux
    00013 !
    00014 !
    00015 program copy
    00016   use grib_api
    00017   implicit none
    00018   integer                            :: err, centre
    00019   integer(kind=kindOfSize)           :: byte_size
    00020   integer                            :: infile,outfile
    00021   integer                            :: igrib_in,iret
    00022   integer                            :: igrib_out
    00023   character(len=1), dimension(:), allocatable :: message
    00024
    00025
    00026   call grib_open_file(infile,'../../data/constant_field.grib1','r')
    00027   call grib_open_file(outfile,'out.grib1','w')
    00028
    00029   !     a new grib message is loaded from file
    00030   !     igrib is the grib id to be used in subsequent calls
    00031   call grib_new_from_file(infile,igrib_in)
    00032
    00033   call grib_get_message_size(igrib_in, byte_size)
    00034   allocate(message(byte_size), stat=err)
    00035
    00036   call grib_copy_message(igrib_in,message)
    00037
    00038   call grib_new_from_message(igrib_out, message)
    00039
    00040   centre=80
    00041   call grib_set(igrib_out,"centre",centre)
    00042
    00043 !  write messages to a file
    00044   call grib_write(igrib_out,outfile)
    00045
    00046   call grib_release(igrib_out)
    00047
    00048   call grib_release(igrib_in)
    00049
    00050   call grib_close_file(infile)
    00051   call grib_close_file(outfile)
    00052   deallocate(message)
    00053
    00054 end program copy