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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: multi
*
* Description: How to decode grib messages containing multiple
* fields. Try to turn on and off multi support to
* see the difference. Default is OFF.
* For all the tools default is multi support ON.
*
*
*
*
*/
#include <stdio.h>
#include <stdlib.h>
#include "grib_api.h"
int main(int argc, char** argv) {
int err = 0;
long parameterCategory=0,parameterNumber=0,discipline=0;
FILE* in = NULL;
char* filename = "../data/multi.grib2";
grib_handle *h = NULL;
/* turn on support for multi fields messages */
grib_multi_support_on(0);
/* turn off support for multi fields messages */
/* grib_multi_support_off(0); */
in = fopen(filename,"r");
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);
GRIB_CHECK(grib_get_long(h,"discipline",&discipline),0);
printf("discipline=%ld\n",discipline);
GRIB_CHECK(grib_get_long(h,"parameterCategory",¶meterCategory),0);
printf("parameterCategory=%ld\n",parameterCategory);
GRIB_CHECK(grib_get_long(h,"parameterNumber",¶meterNumber),0);
printf("parameterNumber=%ld\n",parameterNumber);
if ( discipline == 0 && parameterCategory==2) {
if (parameterNumber == 2) printf("-------- u -------\n");
if (parameterNumber == 3) printf("-------- v -------\n");
}
}
grib_handle_delete(h);
fclose(in);
return 0;
}
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