! (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.
!
!
! Description: How to get PV values.
!
!
program grib_get_pv
   use eccodes
   implicit none
   integer                         :: infile
   integer                         :: igrib
   integer                         :: PVPresent, nb_pv
   real(kind=4), dimension(:), allocatable :: pv

   call codes_open_file(infile, '../../data/reduced_gaussian_model_level.grib1', 'r')

   ! A new GRIB message is loaded from file
   ! igrib is the message id to be used in subsequent calls
   call codes_grib_new_from_file(infile, igrib)

   ! Get PVPresent to see if the 'pv' array is there
   call codes_get(igrib, 'PVPresent', PVPresent)
   print *, "PVPresent = ", PVPresent
   if (PVPresent == 1) then
      call codes_get_size(igrib, 'pv', nb_pv)
      print *, "There are ", nb_pv, " PV values"
      allocate (pv(nb_pv))
      call codes_get(igrib, 'pv', pv)
      print *, "pv = ", pv
      deallocate (pv)
   else
      print *, "There is no PV values in your GRIB message!"
   end if
   call codes_release(igrib)

   call codes_close_file(infile)

end program grib_get_pv