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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="simple-example"></a>Using basic Geoclue providers: simple example in C</h2></div></div></div>
<p>There are several examples in the geoclue source, these are included here to
give a quick overview.
</p>
<p>
Here is a very simple example of using a specific Geoclue Position provider.
Note that we're using the synchronous version of the method call here, so
geoclue_position_get_position() will block until the response comes (or until D-Bus timeouts).
</p>
<pre class="programlisting">
#include <geoclue/geoclue-position.h>
int main()
{
GeocluePosition *pos;
GeocluePositionFields fields;
double lat, lon;
GError *error = NULL;
g_type_init ();
/* Create the position object */
pos = geoclue_position_new ("org.freedesktop.Geoclue.Providers.Hostip",
"/org/freedesktop/Geoclue/Providers/Hostip");
/* call get_position. Note that unneeded output variables (here
timestamp, altitude and accuracy) can be left NULL */
fields = geoclue_position_get_position (pos, NULL,
&lat, &lon, NULL,
NULL, &error);
if (error) {
g_printerr ("Error in get_position: %s.\n", error->message);
g_error_free (error);
g_object_unref (pos);
return 1;
}
if (fields & GEOCLUE_POSITION_FIELDS_LATITUDE &&
fields & GEOCLUE_POSITION_FIELDS_LONGITUDE) {
g_print ("According to Hostip.info we're at %.3f, %.3f.\n",
lat, lon);
} else {
g_print ("Hostip does not have a valid location available.\nVisit http://www.hostip.info/ to correct this");
}
g_object_unref (pos);
return 0;
}
</pre>
<p>Save as test-hostip.c and compile with
</p>
<pre class="programlisting">
gcc `pkg-config --libs --cflags geoclue` -o test-hostip test-hostip.c
</pre>
<p>Here is a similarly simple example using GLib mainloop and Gypsy provider with
position-changed signals:
</p>
<pre class="programlisting">
#include <geoclue/geoclue-position.h>
/* device name or bluetooth address */
#define GPS_DEVICE_NAME "00:02:76:C5:81:BF"
static void
position_changed (GeocluePosition *position,
GeocluePositionFields fields,
int timestamp,
double latitude,
double longitude,
double altitude,
GeoclueAccuracy *accuracy,
gpointer userdata)
{
g_print ("Position changed:\n");
if (fields & GEOCLUE_POSITION_FIELDS_LATITUDE &&
fields & GEOCLUE_POSITION_FIELDS_LONGITUDE) {
g_print ("\t%f, %f\n\n", latitude, longitude);
} else {
g_print ("\tLatitude and longitude not available.\n\n");
}
}
int main()
{
GMainLoop *loop;
GHashTable *options;
GeocluePosition *pos;
GError *error = NULL;
g_type_init ();
/* Create the position object */
pos = geoclue_position_new ("org.freedesktop.Geoclue.Providers.Gypsy",
"/org/freedesktop/Geoclue/Providers/Gypsy");
/* Set GPS device name option for Gypsy */
options = g_hash_table_new (g_str_hash, g_str_equal);
g_hash_table_insert (options, "org.freedesktop.Geoclue.GPSDevice", GPS_DEVICE_NAME);
if (!geoclue_provider_set_options (GEOCLUE_PROVIDER (pos), options, &error)) {
g_printerr ("Error setting options: %s\n", error->message);
g_error_free (error);
g_hash_table_destroy (options);
g_object_unref (pos);
return 1;
}
g_hash_table_destroy (options);
/* connect to signal */
g_signal_connect (G_OBJECT (pos), "position-changed",
G_CALLBACK (position_changed), NULL);
g_print ("Waiting for position change signals...\n");
loop = g_main_loop_new (NULL, FALSE);
g_main_loop_run (loop);
g_main_loop_unref (loop);
g_object_unref (pos);
return 0;
}
</pre>
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