Ich habe mir libnova-0.14-0 installiert:
Anschliessend habe ich noch libnovadocs runtergeladen und wollte gleich mal das Beispiel sun.c mit g++ sun.c compilieren:
Spoiler anzeigen
#include <stdio.h>
#include <libnova/solar.h>
#include <libnova/julian_day.h>
#include <libnova/rise_set.h>
#include <libnova/transform.h>
static void print_date (char *title, struct ln_zonedate *date)
{
fprintf(stdout, "\n%s\n",title);
fprintf(stdout, " Year : %d\n", date->years);
fprintf(stdout, " Month : %d\n", date->months);
fprintf(stdout, " Day : %d\n", date->days);
fprintf(stdout, " Hours : %d\n", date->hours);
fprintf(stdout, " Minutes : %d\n", date->minutes);
fprintf(stdout, " Seconds : %f\n", date->seconds);
}
int main (int argc, const char *argv[])
{
struct ln_equ_posn equ;
struct ln_rst_time rst;
struct ln_zonedate rise, set, transit;
struct ln_lnlat_posn observer;
struct ln_helio_posn pos;
double JD;
/* observers location (Edinburgh), used to calc rst */
observer.lat = 55.92; /* 55.92 N */
observer.lng = -3.18; /* 3.18 W */
/* get Julian day from local time */
JD = ln_get_julian_from_sys();
fprintf(stdout, "JD %f\n", JD);
/* geometric coordinates */
ln_get_solar_geom_coords(JD, &pos);
fprintf(stdout, "Solar Coords longitude (deg) %f\n", pos.L);
fprintf(stdout, " latitude (deg) %f\n", pos.B);
fprintf(stdout, " radius vector (AU) %f\n", pos.R);
/* ra, dec */
ln_get_solar_equ_coords(JD, &equ);
fprintf(stdout, "Solar Position RA %f\n", equ.ra);
fprintf(stdout, " DEC %f\n", equ.dec);
/* rise, set and transit */
if (ln_get_solar_rst(JD, &observer, &rst) != 0)
fprintf(stdout, "Sun is circumpolar\n");
else {
ln_get_local_date(rst.rise, &rise);
ln_get_local_date(rst.transit, &transit);
ln_get_local_date(rst.set, &set);
print_date("Rise", &rise);
print_date("Transit", &transit);
print_date("Set", &set);
}
return 0;
}
Leider bekomme ich Fehlermeldungen:
sun.c: In function 'int main(int, char**)':
sun.c:53:42: warning: deprecated conversion from string constant to 'char*' [-Wwrite-strings]
sun.c:54:48: warning: deprecated conversion from string constant to 'char*' [-Wwrite-strings]
sun.c:55:40: warning: deprecated conversion from string constant to 'char*' [-Wwrite-strings]
/tmp/ccya8Aj7.o: In function 'main':
sun.c (.text+0xe4): undefined reference to 'ln_get_julian_from_sys'
sun.c (.text+0x108): undefined reference to 'ln_get_solar_geom_coords'
sun.c (.text+0x13c): undefined reference to 'ln_get_solar_equ_coords'
sun.c (.text+0x16c): undefined reference to 'ln_get_solar_rst'
sun.c (.text+0x1a8): undefined reference to 'ln_get_local_date'
sun.c (.text+0x1bc): undefined reference to 'ln_get_local_date'
sun.c (.text+0x1d0): undefined reference to 'ln_get_local_date'
Alles anzeigen
Kann das mal einer deuten, was da schief läuft ?
Edit: Gelöst, man muss nur mit der Option -lnova compilieren:
Die deprecated-Warnung ignoriere ich mal