grib_api: copy_message.f90

00001 ! Copyright 2005-2007 ECMWF
00002 ! 
00003 ! Licensed under the GNU Lesser General Public License which
00004 ! incorporates the terms and conditions of version 3 of the GNU
00005 ! General Public License.
00006 ! See LICENSE and gpl-3.0.txt for details.
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