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/*
* C Implementation: get_set
*
* Description:
*
* Author: Enrico Fucile <enrico.fucile@ecmwf.int>, (C) 2006
*
* Copyright: See COPYING file that comes with this distribution
*
*/
#include <stdio.h>
#include <stdlib.h>
#include "grib_api.h"
int main(int argc, char** argv) {
int err = 0;
double *values = NULL;
size_t values_len= 0;
size_t i = 0;
double latitudeOfFirstGridPointInDegrees;
double longitudeOfFirstGridPointInDegrees;
double latitudeOfLastGridPointInDegrees;
double longitudeOfLastGridPointInDegrees;
double jDirectionIncrementInDegrees;
double iDirectionIncrementInDegrees;
long numberOfPointsAlongAParallel;
long numberOfPointsAlongAMeridian;
double average = 0;
FILE* in = NULL;
char* filename = "../data/sample1.grib";
grib_handle *h = NULL;
in = fopen(filename,"r");
if(!in) {
printf("ERROR: unable to open file %s\n",filename);
return 1;
}
h = grib_handle_new_from_file(0,in,&err);
if (h == NULL) {
printf("Error: unable to create handle from file %s\n",filename);
}
GRIB_CHECK(grib_get_long(h,"numberOfPointsAlongAParallel",&numberOfPointsAlongAParallel),0);
printf("numberOfPointsAlongAParallel=%ld\n",numberOfPointsAlongAParallel);
GRIB_CHECK(grib_get_long(h,"numberOfPointsAlongAMeridian",&numberOfPointsAlongAMeridian),0);
printf("numberOfPointsAlongAMeridian=%ld\n",numberOfPointsAlongAMeridian);
GRIB_CHECK(grib_get_double(h,"latitudeOfFirstGridPointInDegrees",&latitudeOfFirstGridPointInDegrees),0);
printf("latitudeOfFirstGridPointInDegrees=%g\n",latitudeOfFirstGridPointInDegrees);
GRIB_CHECK(grib_get_double(h,"longitudeOfFirstGridPointInDegrees",&longitudeOfFirstGridPointInDegrees),0);
printf("longitudeOfFirstGridPointInDegrees=%g\n",longitudeOfFirstGridPointInDegrees);
GRIB_CHECK(grib_get_double(h,"latitudeOfLastGridPointInDegrees",&latitudeOfLastGridPointInDegrees),0);
printf("latitudeOfLastGridPointInDegrees=%g\n",latitudeOfLastGridPointInDegrees);
GRIB_CHECK(grib_get_double(h,"longitudeOfLastGridPointInDegrees",&longitudeOfLastGridPointInDegrees),0);
printf("longitudeOfLastGridPointInDegrees=%g\n",longitudeOfLastGridPointInDegrees);
GRIB_CHECK(grib_get_double(h,"jDirectionIncrementInDegrees",&jDirectionIncrementInDegrees),0);
printf("jDirectionIncrementInDegrees=%g\n",jDirectionIncrementInDegrees);
GRIB_CHECK(grib_get_double(h,"iDirectionIncrementInDegrees",&iDirectionIncrementInDegrees),0);
printf("iDirectionIncrementInDegrees=%g\n",iDirectionIncrementInDegrees);
GRIB_CHECK(grib_get_size(h,"values",&values_len),0);
values = malloc(values_len*sizeof(double));
GRIB_CHECK(grib_get_double_array(h,"values",values,&values_len),0);
average = 0;
for(i = 0; i < values_len; i++)
average += values[i];
average /=(double)values_len;
free(values);
printf("There are %d values, average is %g\n",(int)values_len,average);
grib_handle_delete(h);
fclose(in);
return 0;
}
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