mirror of https://github.com/ecmwf/eccodes.git
95 lines
2.6 KiB
C
95 lines
2.6 KiB
C
/*
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* (C) Copyright 2005- 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: grib_print_data
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*
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* Description: prints all the data contained in a GRIB file
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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 "eccodes.h"
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static void usage(const char* prog)
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{
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printf("usage: %s filename\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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{
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int err = 0, i;
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double* values = NULL;
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double max, min, average;
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size_t values_len = 0;
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FILE* in = NULL;
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char* filename;
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codes_handle* h = NULL;
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if (argc < 2) usage(argv[0]);
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filename = argv[1];
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in = fopen(filename, "rb");
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if (!in) {
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fprintf(stderr, "Error: unable to open file %s\n", filename);
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return 1;
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}
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/* create new handle from a message in a file*/
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h = codes_handle_new_from_file(0, in, PRODUCT_GRIB, &err);
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if (h == NULL) {
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fprintf(stderr, "Error: unable to create handle from file %s\n", filename);
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return 1;
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}
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/* get the size of the values array*/
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CODES_CHECK(codes_get_size(h, "values", &values_len), 0);
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values = (double*)malloc(values_len * sizeof(double));
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/* get data values*/
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CODES_CHECK(codes_get_double_array(h, "values", values, &values_len), 0);
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for (i = 0; i < values_len; i++)
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printf("%d %.10e\n", i, values[i]);
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free(values);
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CODES_CHECK(codes_get_double(h, "max", &max), 0);
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CODES_CHECK(codes_get_double(h, "min", &min), 0);
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CODES_CHECK(codes_get_double(h, "average", &average), 0);
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printf("%d values found in %s\n", (int)values_len, filename);
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printf("max=%.10e min=%.10e average=%.10e\n", max, min, average);
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{
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/* example of accessing specific elements from data values */
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double vals_arr[3] = { 0, 0, 0 };
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const int NUM = 3;
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int index_arr[3];
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index_arr[0] = 0; /* first element */
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index_arr[1] = values_len / 2; /* middle element */
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index_arr[2] = values_len - 1; /* last element */
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CODES_CHECK(codes_get_double_elements(h, "values", index_arr, NUM, vals_arr), 0);
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for (i = 0; i < NUM; ++i) {
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printf("value at index %d = %.10e\n", index_arr[i], vals_arr[i]);
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}
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}
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codes_handle_delete(h);
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fclose(in);
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return 0;
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}
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