mirror of https://github.com/ecmwf/eccodes.git
123 lines
2.7 KiB
C
123 lines
2.7 KiB
C
/*
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* C Implementation: create_grib
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*
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* Description:
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*
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*
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* Author: Enrico Fucile <enrico.fucile@ecmwf.int>, (C) 2006
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*
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* Copyright: See COPYING file that comes with this distribution
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*
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*/
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#include <stdio.h>
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#include "grib_api_internal.h"
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int main(int argc, char *argv[])
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{
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FILE* of=NULL;
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const void* buffer=NULL;
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int ret=0;
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size_t size;
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double* values=NULL;
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long numberOfPointsAlongAParallel=0;
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long numberOfPointsAlongAMeridian=0;
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long numberOfPoints = 0,i = 0,j = 0,k = 0;
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grib_context* c=NULL;
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grib_handle* h=NULL;
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char* outfilename="out.grib";
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long missing=9999;
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#if 0
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FILE *f=NULL;
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char* infilename="../data/sample_grib.txt";
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f = fopen(infilename,"r");
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if(!f) {
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perror(argv[i]);
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exit(1);
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}
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h=grib_handle_new_from_text_file(c,f);
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fclose(f);
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#endif
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#if 0
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FILE *f=NULL;
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char* infilename="../data/sample_grib.txt";
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f = fopen(infilename,"r");
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if(!f) {
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perror(argv[i]);
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exit(1);
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}
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h=grib_handle_new(c);
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GRIB_CHECK(grib_load_from_text_file(h,f),0);
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fclose(f);
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#endif
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#if 1
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h=grib_handle_new(c);
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GRIB_CHECK(grib_set_type(h,"grib1"),0);
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GRIB_CHECK(grib_set_type(h,"ecmwf"),0);
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GRIB_CHECK(grib_set_type(h,"geopotential"),0);
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#endif
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GRIB_CHECK(grib_set_long(h,"generatingProcessIdentifier",127),0);
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GRIB_CHECK(grib_set_double(h,"latitudeOfFirstGridPointInDegrees",10),0);
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GRIB_CHECK(grib_set_double(h,"longitudeOfFirstGridPointInDegrees",-10),0);
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GRIB_CHECK(grib_set_double(h,"latitudeOfLastGridPointInDegrees",-10),0);
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GRIB_CHECK(grib_set_double(h,"longitudeOfLastGridPointInDegrees",10),0);
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GRIB_CHECK(grib_set_double(h,"jDirectionIncrementInDegrees",0.5),0);
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GRIB_CHECK(grib_set_double(h,"iDirectionIncrementInDegrees",0.5),0);
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GRIB_CHECK(grib_set_long(h,"section3Present",1),0);
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GRIB_CHECK(grib_set_long(h,"missingValue",missing),0);
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GRIB_CHECK(grib_get_long( h,"numberOfPointsAlongAParallel",&numberOfPointsAlongAParallel),0);
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GRIB_CHECK(grib_get_long( h,"numberOfPointsAlongAMeridian",&numberOfPointsAlongAMeridian),0);
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numberOfPoints=numberOfPointsAlongAMeridian*numberOfPointsAlongAParallel;
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values=(double*)malloc(numberOfPoints*sizeof(double));
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for (j=0;j<numberOfPointsAlongAMeridian;j++) {
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for (i=0;i<numberOfPointsAlongAParallel;i++) {
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k=i+numberOfPointsAlongAParallel*j;
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if (i==j) values[k]=missing;
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else values[k]=50;
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}
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}
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grib_set_data_array( h,values,numberOfPoints);
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if (h) {
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grib_dump_content(h,stdout,"debug",0,NULL);
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} else {
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printf("Error: unable to create grib_handle\n");
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}
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of = fopen(outfilename,"w");
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if(!of) {
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perror(outfilename);
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exit(1);
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}
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grib_get_message(h,&buffer,&size);
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if(fwrite(buffer,1,size,of) != size) {
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perror(outfilename);
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exit(1);
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}
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fclose(of);
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return ret;
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}
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