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<a name="simple-master-example"></a>Master provider: simple example in C</h2></div></div></div>
<p>
Here is the "Hello World" for Geoclue Master. It shows one of the advantages of
using the Master provider: Even most web service
providers can be used as signal emitting providers (master queries them whenever
network connection changes).
</p>
<pre class="programlisting">
#include <geoclue/geoclue-master.h>
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;
GeoclueMaster *master;
GeoclueMasterClient *client;
GeocluePosition *pos;
GeocluePositionFields fields;
double lat, lon;
GError *error = NULL;
g_type_init ();
/* create a MasterClient using Master */
master = geoclue_master_get_default ();
client = geoclue_master_create_client (master, NULL, &error);
g_object_unref (master);
if (!client) {
g_printerr ("Error creating GeoclueMasterClient: %s\n", error->message);
g_error_free (error);
return 1;
}
/* Set our requirements: We want at least city level accuracy, require signals,
and allow the use of network (but not e.g. GPS) */
if (!geoclue_master_client_set_requirements (client,
GEOCLUE_ACCURACY_LEVEL_LOCALITY,
0, TRUE,
GEOCLUE_RESOURCE_NETWORK,
&error)){
g_printerr ("set_requirements failed: %s", error->message);
g_error_free (error);
g_object_unref (client);
return 1;
}
/* Get a Position object */
pos = geoclue_master_client_create_position (client, NULL);
if (!pos) {
g_printerr ("Failed to get a position object");
g_object_unref (client);
return 1;
}
/* call get_position. We do not know which provider actually provides
the answer (although we could find out using MasterClient API) */
fields = geoclue_position_get_position (pos, NULL,
&lat, &lon, NULL,
NULL, &error);
if (error) {
g_printerr ("Error in geoclue_position_get_position: %s.\n", error->message);
g_error_free (error);
error = NULL;
} else {
if (fields & GEOCLUE_POSITION_FIELDS_LATITUDE &&
fields & GEOCLUE_POSITION_FIELDS_LONGITUDE) {
g_print ("We're at %.3f, %.3f.\n", lat, lon);
}
}
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);
g_object_unref (client);
return 0;
}
</pre>
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