mirror of https://github.com/ecmwf/eccodes.git
93 lines
2.0 KiB
C
93 lines
2.0 KiB
C
/*
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* Copyright 2005-2016 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: set_bitmap
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*
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* Description: how to set a bitmap in a grib message
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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 "grib_api.h"
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int main(int argc, char** argv) {
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int err = 0;
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size_t size=0;
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FILE* in = NULL;
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char* infile = "../data/regular_latlon_surface.grib1";
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FILE* out = NULL;
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char* outfile = "out.grib1";
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grib_handle *h = NULL;
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const void* buffer = NULL;
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size_t values_len;
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double* values;
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double missing=0;
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int i=0;
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in = fopen(infile,"r");
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if(!in) {
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printf("ERROR: unable to open file %s\n",infile);
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return 1;
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}
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out = fopen(outfile,"w");
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if(!in) {
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printf("ERROR: unable to open file %s\n",outfile);
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return 1;
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}
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h = grib_handle_new_from_file(0,in,&err);
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if (h == NULL) {
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printf("Error: unable to create handle from file %s\n",infile);
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}
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GRIB_CHECK(grib_get_double(h,"missingValue",&missing),0);
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/* get the size of the values array*/
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GRIB_CHECK(grib_get_size(h,"values",&values_len),0);
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values = malloc(values_len*sizeof(double));
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/* get data values*/
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GRIB_CHECK(grib_get_double_array(h,"values",values,&values_len),0);
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GRIB_CHECK(grib_set_long(h,"bitmapPresent",1),0);
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for(i = 0; i < 10; i++)
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values[i]=missing;
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GRIB_CHECK(grib_set_double_array(h,"values",values,values_len),0);
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/* get the coded message in a buffer */
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GRIB_CHECK(grib_get_message(h,&buffer,&size),0);
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/* write the buffer in a file*/
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if(fwrite(buffer,1,size,out) != size)
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{
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perror(outfile);
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exit(1);
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}
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/* delete handle */
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grib_handle_delete(h);
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fclose(in);
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fclose(out);
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return 0;
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}
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