libhomeradar

With this example we will not add any hosts. We try to connect to a running libhomeradar instance which have a listener on port 10000 installed. (See example #13). The mode is LHR_POLL (active mode, we read the messages from the open socket).

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/* System includes */
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>

/* libhomeradar header include */
#include "libhomeradar.h"

/* Global variable to libhomeradar */
LHR H = NULL;

/* Callback function to show aircraft informations */
void newcontact(void *handle,const int *id, LHR_CONTACT *C) {
  LHR_AIRPORTS *P;

  printf("%sContact: %s [%s]\nAirline: %s\nFlightnumber: %s  Callsign: %s\nSquawk: %04d\n",
         (C->newcontact)?"AIR":"",
          C->icao24,(C->reg)?C->reg:"UNKNOWN",
         (C->airline)?C->airline:"NULL",C->flightnum,C->callsign,C->squawk);
  printf("Aircraft: %s %s [%s] cn:%s\n",C->manufacturer,C->model,C->details,C->cn);
  printf("Routing: %s LAT: %0.5f LON: %0.5f\n",(C->route)?C->route:"UNKNOWN",C->lat,C->lon);

  /* Get airport informations */
  P = C->airports;
  while (P) {
    if (P->airport) {
      printf("Airport [%s / %s] Name: %s, %s\n",
             P->airport->iata,P->airport->icao,
             P->airport->name,P->airport->country);
    } else printf("Unresolveable: %s\n",P->apcode);
    P = P->next;
  }

  printf("..F..\n");

  /* Free LHR_CONTACT struct */
  homeradar_freecontact(C);
}

/* Callback function to show aircraft informations */
void newcontactRB(void *handle,const int *id, LHR_CONTACT *C) {

  /* Show only ICAO24 and registration */
  printf("[RADARBOX]\n%sContact: %s [%s]\n",(C->newcontact)?"AIR":"",
          C->icao24,(C->reg)?C->reg:"UNKNOWN");

  /* Free LHR_CONTACT struct */
  homeradar_freecontact(C);
}

/* Shutdown library and finish program */
void shutdownlib(int sig) {

  printf("Shutdown system. Closing library handle...\n");

  /* Close lib handle */
  if (H) homeradar_destroy(H);
  exit(0);
}

/* Main program */
int main(int argc, char **argv) {
  int e, h;

  /* Init global variable */
  H = homeradar_init(16,LHR_AUTOCONNECT|LHR_LOOKUP_ALL,&e,NULL);

  /* No error */
  if (H == NULL) {
    printf("Error initializing libhomeradar. Errorcode #%d\n",e);
    return 255;
  }

  /* Catch SIGINT signals (CTRL-C) */
  (void)signal(SIGINT, shutdownlib);

  /* Load databases from disc
     Files should be located within the current directory */
  homeradar_load_databases(H, "./");

  /* Create listener for external socket connects */
  if (!(h = homeradar_socketinput(H, 1, LHR_POLL, 10000, "localhost")))
    printf("Unable to create connection to localhost on port 10000\n");

  /* Setup the event listener for the LHR_ONCONTACT event */
  if (homeradar_onhandler(H, LHR_ONCONTACT, h, newcontact)==0)
    printf("Unable to add event listener (1)\n");

  /* Do nothing - in this example - loop will be finished after 5 minutes
     In your real program you can do now what you want */
  sleep(300);

  /* Destroy lib handler */
  homeradar_destroy(H);

  /* Return success */
  return 0;
}