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# print_data.c

print_data.c How to print all the data from a grib message.

    00001
    00010 /*
    00011  * C Implementation: print_data
    00012  *
    00013  * Description: prints all the data contained in a grib file
    00014  *
    00015  * Author: Enrico Fucile
    00016  *
    00017  *
    00018  */
    00019 #include <stdio.h>
    00020 #include <stdlib.h>
    00021
    00022 #include "grib_api.h"
    00023
    00024 void usage(char* prog) {
    00025   printf("usage: %s filename\n",prog);
    00026   exit(1);
    00027 }
    00028
    00029 int main(int argc, char** argv) {
    00030   int err = 0,i;
    00031   double *values = NULL;
    00032   double max,min,average;
    00033   size_t values_len= 0;
    00034
    00035   FILE* in = NULL;
    00036   char* filename ;
    00037   grib_handle *h = NULL;
    00038
    00039   if (argc<2) usage(argv[0]);
    00040   filename=argv[1];
    00041
    00042   in = fopen(filename,"r");
    00043   if(!in) {
    00044     printf("ERROR: unable to open file %s\n",filename);
    00045     return 1;
    00046   }
    00047
    00048   /* create new handle from a message in a file*/
    00049   h = grib_handle_new_from_file(0,in,&err);
    00050   if (h == NULL) {
    00051     printf("Error: unable to create handle from file %s\n",filename);
    00052   }
    00053
    00054
    00055   /* get the size of the values array*/
    00056   GRIB_CHECK(grib_get_size(h,"values",&values_len),0);
    00057
    00058   values = malloc(values_len*sizeof(double));
    00059
    00060   /* get data values*/
    00061   GRIB_CHECK(grib_get_double_array(h,"values",values,&values_len),0);
    00062
    00063   for(i = 0; i < values_len; i++)
    00064     printf("%d  %.10e\n",i+1,values[i]);
    00065
    00066   free(values);
    00067
    00068
    00069   GRIB_CHECK(grib_get_double(h,"max",&max),0);
    00070   GRIB_CHECK(grib_get_double(h,"min",&min),0);
    00071   GRIB_CHECK(grib_get_double(h,"average",&average),0);
    00072
    00073   printf("%d values found in %s\n",(int)values_len,filename);
    00074   printf("max=%.10e min=%.10e average=%.10e\n",max,min,average);
    00075
    00076   grib_handle_delete(h);
    00077
    00078   fclose(in);
    00079   return 0;
    00080 }