How to read GRIB file with ECMWF library

Quote:

Hello recently I am using ECMWF library to read GRIB file and everything is ok when I built the program but it could not read the GRIB file so it gives me "End of resource reached when reading message" this error even though i am using different GRIB file. thank you for answering.

#include <stdio.h>
#include <stdlib.h>

extern "C"{
#include <grib_api.h>
}

#include <qdebug.h>
#include <QtCore/QCoreApplication>

int main(int argc, char *argv[])
{
	QCoreApplication a(argc, argv);

	int err = 0,i;
	double *values = NULL;
	double max,min,average;
	size_t values_len= 0;

	//FILE* in = NULL;
	 
	grib_handle *h = NULL;

	const char* path = "exmaple.grb";

	FILE* in = fopen( path,"r" );

	if(!in) 
	{
		printf("ERROR: unable to open file %s\n",path);
		return 1;
    }

	h = grib_handle_new_from_file(0,in,&err); "problem is here err = -44 it means" 
                                       "End of resource reached when reading message"

	if (h == NULL)
	{
       printf("Error: unable to create handle from file %s\n",path);
    }

	GRIB_CHECK(grib_get_size(h,"values",&values_len),0);

	return a.exec();
}