grib_print_data

! (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: prints all the data contained in a GRIB file
!
!
!
program print_data
use eccodes
implicit none
integer            :: ifile
integer            :: iret
integer            :: igrib
integer            :: i
real(kind=8), dimension(:), allocatable       :: values
integer(kind=4)    :: numPoints
real(kind=8)       :: average
real(kind=8)       :: the_max
real(kind=8)       :: the_min

  call codes_open_file(ifile, &
           '../../data/constant_field.grib1','r')

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

  ! Get the size of the values array
  call codes_get_size(igrib,'values',numPoints)

  ! Get data values
  print*, 'number of points ', numPoints
  allocate(values(numPoints), stat=iret)

  call codes_get(igrib,'values',values)

  do i=1,numPoints
    write(*,*)'  ',i,values(i)
  enddo

  write(*,*)numPoints,' values found '

  call codes_get(igrib,'max',the_max)
  write(*,*) 'max=',the_max
  call codes_get(igrib,'min',the_min)
  write(*,*) 'min=',the_min
  call codes_get(igrib,'average',average)
  write(*,*) 'average=',average

  call codes_release(igrib)
  call codes_close_file(ifile)
  deallocate(values)

end program print_data

#
# (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: prints all the data contained in a GRIB file
#

import traceback
import sys

from eccodes import *

INPUT = '../../data/regular_latlon_surface.grib1'
VERBOSE = 1  # verbose error reporting


def example():
    f = open(INPUT, 'rb')
    gid = codes_grib_new_from_file(f)

    values = codes_get_values(gid)
    num_vals = len(values)
    for i in range(num_vals):
        print("%d %.10e" % (i + 1, values[i]))

    print('%d values found in %s' % (num_vals, INPUT))

    for key in ('max', 'min', 'average'):
        print('%s=%.10e' % (key, codes_get(gid, key)))

    # Example of accessing specific elements from data values
    # Get first, middle and last elements
    indexes = [0, int(num_vals/2), num_vals-1]
    elems = codes_get_double_elements(gid, 'values', indexes)

    codes_release(gid)
    f.close()


def main():
    try:
        example()
    except CodesInternalError as err:
        if VERBOSE:
            traceback.print_exc(file=sys.stderr)
        else:
            sys.stderr.write(err.msg + '\n')

        return 1


if __name__ == "__main__":
    sys.exit(main())

/*
 * (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.
 */

/*
 * C Implementation: grib_print_data
 *
 * Description: prints all the data contained in a GRIB file
 *
 */
#include <stdio.h>
#include <stdlib.h>

#include "eccodes.h"

static void usage(const char* prog) {
    printf("usage: %s filename\n",prog);
    exit(1);
}

int main(int argc, char** argv)
{
    int err = 0,i;
    double *values = NULL;
    double max,min,average;
    size_t values_len= 0;

    FILE* in = NULL;
    char* filename ;
    codes_handle *h = NULL;

    if (argc<2) usage(argv[0]);
    filename=argv[1];

    in = fopen(filename,"r");
    if(!in) {
        printf("ERROR: unable to open file %s\n",filename);
        return 1;
    }

    /* create new handle from a message in a file*/
    h = codes_handle_new_from_file(0, in, PRODUCT_GRIB, &err);
    if (h == NULL) {
        printf("Error: unable to create handle from file %s\n",filename);
    }

    /* get the size of the values array*/
    CODES_CHECK(codes_get_size(h,"values",&values_len),0);

    values = (double*)malloc(values_len*sizeof(double));

    /* get data values*/
    CODES_CHECK(codes_get_double_array(h,"values",values,&values_len),0);

    for(i = 0; i < values_len; i++)
        printf("%d  %.10e\n",i,values[i]);

    free(values);

    CODES_CHECK(codes_get_double(h,"max",&max),0);
    CODES_CHECK(codes_get_double(h,"min",&min),0);
    CODES_CHECK(codes_get_double(h,"average",&average),0);

    printf("%d values found in %s\n",(int)values_len,filename);
    printf("max=%.10e min=%.10e average=%.10e\n",max,min,average);

    {
        /* Example of accessing specific elements from data values  */
        double vals_arr[3] = {0, 0, 0};
        const int NUM = 3;
        int index_arr[3];
        index_arr[0] = 0;             /* first element */
        index_arr[1] = values_len/2;  /* middle element */
        index_arr[2] = values_len-1;  /* last element */

        CODES_CHECK(codes_get_double_elements(h, "values", index_arr, NUM, vals_arr), 0);
        for (i=0; i<NUM; ++i){
            printf("value at index %d = %.10e\n", index_arr[i], vals_arr[i]);
        }
    }

    codes_handle_delete(h);

    fclose(in);
    return 0;
}