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/*
* (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: get
*
* Description: how to get values using keys.
*
*
*
*/
#include <stdio.h>
#include <stdlib.h>
#include "grib_api.h"
static void usage(char* prog) {
printf("usage: %s filename\n",prog);
exit(1);
}
int main(int argc, char** argv) {
int err = 0;
size_t i = 0;
int nmsg = 0;
double latitudeOfFirstGridPointInDegrees;
double longitudeOfFirstGridPointInDegrees;
double latitudeOfLastGridPointInDegrees;
double longitudeOfLastGridPointInDegrees;
double jDirectionIncrementInDegrees;
double iDirectionIncrementInDegrees;
long numberOfPointsAlongAParallel;
long numberOfPointsAlongAMeridian;
size_t values_len= 0;
double average;
double min;
double max;
FILE* in = NULL;
char* filename;
grib_handle *h = NULL;
if (argc<2) usage(argv[0]);
filename=argv[1];
in = fopen(filename,"rb");
if(!in) {
printf("ERROR: unable to open file %s\n",filename);
return 1;
}
while((h = grib_handle_new_from_file(0,in,&err)) != NULL) {
GRIB_CHECK(err,0);
nmsg++;
printf("processing message number %d\n",nmsg);
/* get as a long*/
GRIB_CHECK(grib_get_long(h,"Ni",&numberOfPointsAlongAParallel),0);
printf("Ni=%ld\n",numberOfPointsAlongAParallel);
/* get as a long*/
GRIB_CHECK(grib_get_long(h,"Nj",&numberOfPointsAlongAMeridian),0);
printf("Nj=%ld\n",numberOfPointsAlongAMeridian);
/* get as a double*/
GRIB_CHECK(grib_get_double(h,"latitudeOfFirstGridPointInDegrees",&latitudeOfFirstGridPointInDegrees),0);
printf("latitudeOfFirstGridPointInDegrees=%g\n",latitudeOfFirstGridPointInDegrees);
/* get as a double*/
GRIB_CHECK(grib_get_double(h,"longitudeOfFirstGridPointInDegrees",&longitudeOfFirstGridPointInDegrees),0);
printf("longitudeOfFirstGridPointInDegrees=%g\n",longitudeOfFirstGridPointInDegrees);
/* get as a double*/
GRIB_CHECK(grib_get_double(h,"latitudeOfLastGridPointInDegrees",&latitudeOfLastGridPointInDegrees),0);
printf("latitudeOfLastGridPointInDegrees=%g\n",latitudeOfLastGridPointInDegrees);
/* get as a double*/
GRIB_CHECK(grib_get_double(h,"longitudeOfLastGridPointInDegrees",&longitudeOfLastGridPointInDegrees),0);
printf("longitudeOfLastGridPointInDegrees=%g\n",longitudeOfLastGridPointInDegrees);
/* get as a double*/
GRIB_CHECK(grib_get_double(h,"jDirectionIncrementInDegrees",&jDirectionIncrementInDegrees),0);
printf("jDirectionIncrementInDegrees=%g\n",jDirectionIncrementInDegrees);
/* get as a double*/
GRIB_CHECK(grib_get_double(h,"iDirectionIncrementInDegrees",&iDirectionIncrementInDegrees),0);
printf("iDirectionIncrementInDegrees=%g\n",iDirectionIncrementInDegrees);
/* get as a double*/
GRIB_CHECK(grib_get_double(h,"average",&average),0);
GRIB_CHECK(grib_get_double(h,"min",&min),0);
GRIB_CHECK(grib_get_double(h,"max",&max),0);
/* get the size of the values array*/
GRIB_CHECK(grib_get_size(h,"values",&values_len),0);
printf("There are %d, average is %g, min is %g, max is %g\n",(int)values_len,average,min,max);
for (i=0;i<100;i++) printf("-");
printf("\n");
grib_handle_delete(h);
}
fclose(in);
return 0;
}
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