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gps_query issue
by Don Weeks
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Not sure if this goes to the developers list or the users list but I have
the following code listed towards the end of this message. And while the program works while doing the poll, it does not work for the query. In the failed case, lat, long, time and alt are all NaN. However, if the commented out section is run through the debugger, the query succeeds and values are set. For the software I ultimately need to write, another application will periodically grab from me the latitude/long/alt. So I really don't want to implement it with gps poll. I only want to query as needed. Don #ifdef HAVE_CONFIG_H #include <config.h> #endif #include <stdio.h> #include <stdlib.h> #include <string.h> #include <errno.h> #include "gps.h" static struct gps_data_t *gpsdata; int main(int argc, char *argv[]) { char *err_str = NULL; char server[16]; char port[5]; strcpy(server, "127.0.0.1\0"); strcpy(port, "2947\0"); printf("Opening GPSd....\n"); gpsdata = gps_open(server, port); /* gpsdata = gps_open("localhost", "2947"); */ if (!&gpsdata) { switch ( errno ) { case NL_NOSERVICE: err_str = "can't get service entry"; break; case NL_NOHOST: err_str = "can't get host entry"; break; case NL_NOPROTO: err_str = "can't get protocol entry"; break; case NL_NOSOCK: err_str = "can't create socket"; break; case NL_NOSOCKOPT: err_str = "error SETSOCKOPT SO_REUSEADDR"; break; case NL_NOCONNECT: err_str = "can't connect to host"; break; default: err_str = "Unknown"; break; } (void)fprintf( stderr, "cgps: no gpsd running or network error: %d, %s\n", errno, err_str); exit(2); } /* printf("status = %d\n", gpsdata->status); int i=gps_query(gpsdata, "i\n"); printf("Query Status = %d\n", i); i=gps_query(gpsdata, "o\n"); printf("Query Status = %d\n", i); printf("Fix Status = %d Latitiude=%lg Longitude=%lg Time=%lg\n\n", gpsdata->fix.mode, gpsdata->fix.latitude, gpsdata->fix.longitude, gpsdata->fix.time); i=gps_query(gpsdata, "o\n"); printf("Query Status = %d\n", i); printf("Fix Status = %d Latitiude=%lg Longitude=%lg Time=%lg\n\n", gpsdata->fix.mode, gpsdata->fix.latitude, gpsdata->fix.longitude, gpsdata->fix.time); i=gps_query(gpsdata, "o\n"); printf("Query Status = %d\n", i); printf("Fix Status = %d Latitiude=%lg Longitude=%lg Time=%lg\n\n", gpsdata->fix.mode, gpsdata->fix.latitude, gpsdata->fix.longitude, gpsdata->fix.time); i=gps_query(gpsdata, "o\n"); printf("Query Status = %d\n", i); printf("Fix Status = %d Latitiude=%lg Longitude=%lg Time=%lg\n\n", gpsdata->fix.mode, gpsdata->fix.latitude, gpsdata->fix.longitude, gpsdata->fix.time); */ gps_query(gpsdata, "w\n"); while (1) { gps_poll(gpsdata); printf("Fix Status = %d Latitiude=%lg Longitude=%lg Altitude=%f Time=%f\n\n", gpsdata->fix.mode, gpsdata->fix.latitude, gpsdata->fix.longitude, gpsdata->fix.altitude, gpsdata->fix.time); } } _______________________________________________ Gpsd-users mailing list Gpsd-users@... https://lists.berlios.de/mailman/listinfo/gpsd-users |
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Re: gps_query issue
by Don Weeks
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Output from a good run and a bad run.
Fix Status = 3 Latitiude=32.988 Longitude=-96.7274 Altitude=206.000000 Time=1247178779.000000 Fix Status = 3 Latitiude=32.988 Longitude=-96.7274 Altitude=206.000000 Time=1247178780.000000 Fix Status = 3 Latitiude=32.988 Longitude=-96.7274 Altitude=206.000000 Time=1247178780.000000 Fix Status = 3 Latitiude=32.988 Longitude=-96.7274 Altitude=206.000000 Time=1247178781.000000 Fix Status = 3 Latitiude=32.988 Longitude=-96.7274 Altitude=206.000000 Time=1247178781.000000 dweeks@n5skt-deb:~/gpsd_query/src$ gcc -g -o gpsd_query gpsd_query.c -lgps -I /usr/local/include dweeks@n5skt-deb:~/gpsd_query/src$ ./gpsd_query Opening GPSd.... status = 0 Query Status = 0 Query Status = 0 Fix Status = 0 Latitiude=nan Longitude=nan Time=nan Query Status = 0 Fix Status = 0 Latitiude=nan Longitude=nan Time=nan Query Status = 0 Fix Status = 0 Latitiude=nan Longitude=nan Time=nan Query Status = 0 Fix Status = 0 Latitiude=nan Longitude=nan Time=nan On Thu, Jul 9, 2009 at 5:30 PM, Don Weeks <don.l.weeks.jr@...> wrote: > Not sure if this goes to the developers list or the users list but I have > the following code listed towards the end of this message. And while the > program works while doing the poll, it does not work for the query. In the > failed case, lat, long, time and alt are all NaN. However, if the commented > out section is run through the debugger, the query succeeds and values are > set. For the software I ultimately need to write, another application will > periodically grab from me the latitude/long/alt. So I really don't want to > implement it with gps poll. I only want to query as needed. > Don > > > #ifdef HAVE_CONFIG_H > #include <config.h> > #endif > > #include <stdio.h> > #include <stdlib.h> > #include <string.h> > #include <errno.h> > #include "gps.h" > > static struct gps_data_t *gpsdata; > int main(int argc, char *argv[]) > { > char *err_str = NULL; > char server[16]; > char port[5]; > strcpy(server, "127.0.0.1\0"); > strcpy(port, "2947\0"); > > printf("Opening GPSd....\n"); > gpsdata = gps_open(server, port); > > /* gpsdata = gps_open("localhost", "2947"); */ > if (!&gpsdata) { > switch ( errno ) { > case NL_NOSERVICE: err_str = "can't get service entry"; break; > case NL_NOHOST: err_str = "can't get host entry"; break; > case NL_NOPROTO: err_str = "can't get protocol entry"; > break; > case NL_NOSOCK: err_str = "can't create socket"; break; > case NL_NOSOCKOPT: err_str = "error SETSOCKOPT SO_REUSEADDR"; > break; > case NL_NOCONNECT: err_str = "can't connect to host"; break; > default: err_str = "Unknown"; break; > } > (void)fprintf( stderr, > "cgps: no gpsd running or network error: %d, %s\n", > errno, err_str); > exit(2); > } > /* printf("status = %d\n", gpsdata->status); > int i=gps_query(gpsdata, "i\n"); > printf("Query Status = %d\n", i); > i=gps_query(gpsdata, "o\n"); > printf("Query Status = %d\n", i); > printf("Fix Status = %d Latitiude=%lg Longitude=%lg Time=%lg\n\n", > gpsdata->fix.mode, gpsdata->fix.latitude, gpsdata->fix.longitude, > gpsdata->fix.time); > i=gps_query(gpsdata, "o\n"); > printf("Query Status = %d\n", i); > printf("Fix Status = %d Latitiude=%lg Longitude=%lg Time=%lg\n\n", > gpsdata->fix.mode, gpsdata->fix.latitude, gpsdata->fix.longitude, > gpsdata->fix.time); > i=gps_query(gpsdata, "o\n"); > printf("Query Status = %d\n", i); > printf("Fix Status = %d Latitiude=%lg Longitude=%lg Time=%lg\n\n", > gpsdata->fix.mode, gpsdata->fix.latitude, gpsdata->fix.longitude, > gpsdata->fix.time); > i=gps_query(gpsdata, "o\n"); > printf("Query Status = %d\n", i); > printf("Fix Status = %d Latitiude=%lg Longitude=%lg Time=%lg\n\n", > gpsdata->fix.mode, gpsdata->fix.latitude, gpsdata->fix.longitude, > gpsdata->fix.time); > */ > gps_query(gpsdata, "w\n"); > while (1) { > gps_poll(gpsdata); > printf("Fix Status = %d Latitiude=%lg Longitude=%lg Altitude=%f > Time=%f\n\n", gpsdata->fix.mode, gpsdata->fix.latitude, > gpsdata->fix.longitude, gpsdata->fix.altitude, gpsdata->fix.time); > } > } > Gpsd-users mailing list Gpsd-users@... https://lists.berlios.de/mailman/listinfo/gpsd-users |
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Re: gps_query issue
by Eric Raymond-3
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Don Weeks <don.l.weeks.jr@...>:
> Not sure if this goes to the developers list or the users list but I have > the following code listed towards the end of this message. And while the > program works while doing the poll, it does not work for the query. In the > failed case, lat, long, time and alt are all NaN. However, if the commented > out section is run through the debugger, the query succeeds and values are > set. For the software I ultimately need to write, another application will > periodically grab from me the latitude/long/alt. So I really don't want to > implement it with gps poll. I only want to query as needed. It won't work that way. See the FAQ entry http://gpsd.berlios.de/faq.html#singleshot for explanation. -- <a href="http://www.catb.org/~esr/">Eric S. Raymond</a> _______________________________________________ Gpsd-users mailing list Gpsd-users@... https://lists.berlios.de/mailman/listinfo/gpsd-users |
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