mirror of https://github.com/ecmwf/eccodes.git
85 lines
2.1 KiB
C
85 lines
2.1 KiB
C
/*
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* Copyright 2005-2012 ECMWF.
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*
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* This software is licensed under the terms of the Apache Licence Version 2.0
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* which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
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*
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* In applying this licence, ECMWF does not waive the privileges and immunities granted to it by
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* virtue of its status as an intergovernmental organisation nor does it submit to any jurisdiction.
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*/
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/*
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* C Implementation: fieldset
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*
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* Description: how to use a fieldset.
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*
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*
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*
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "grib_api.h"
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void usage(char* prog) {
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printf("Usage: %s order_by grib_file grib_file ...\n",prog);
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exit(1);
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}
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int main(int argc, char** argv) {
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int err = 0;
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long step,levelType;
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char** filenames;
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size_t nkeys,nfiles;
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int i=0;
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char* keys[]={"step","date","param","levelType"};
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grib_fieldset* set;
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grib_handle* h;
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char param[20]={0,};
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char date[10]={0,};
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size_t datelen=10;
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size_t len=20;
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char* order_by=0;
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if (argc != 3) usage(argv[0]);
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nkeys=sizeof(keys)/sizeof(*keys);
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order_by=strdup(argv[1]);
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nfiles=argc-2;
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filenames=(char**)malloc(sizeof(char*)*nfiles);
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for (i=0;i<nfiles;i++)
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filenames[i]=(char*)strdup(argv[i+2]);
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set=grib_fieldset_new_from_files(0,filenames,nfiles,keys,nkeys,0,0,&err);
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GRIB_CHECK(err,0);
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/* not jet implemented */
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/* err=grib_fieldset_apply_where(set,"(centre=='ecmf') && number==1 || step==6 "); */
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/* GRIB_CHECK(err,0); */
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grib_fieldset_apply_order_by(set,order_by);
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GRIB_CHECK(err,0);
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printf("\nordering by %s\n",order_by);
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printf("\n%d fields in the fieldset\n",grib_fieldset_count(set));
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printf("step,date,levelType,levelType\n");
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while ((h=grib_fieldset_next_handle(set,&err))!=NULL) {
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GRIB_CHECK(grib_get_long(h,"step",&step),0);
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GRIB_CHECK(grib_get_string(h,"date",date,&datelen),0);
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GRIB_CHECK(grib_get_string(h,"param",param,&len),0);
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GRIB_CHECK(grib_get_long(h,"levelType",&levelType),0);
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printf("%ld %s %ld %s\n",step,date,levelType,param);
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grib_handle_delete(h);
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}
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grib_fieldset_delete(set);
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grib_handle_delete(h);
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return 0;
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}
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