获得应用使用的位置（无线定位系统）

流星悟语

下面是如何使用的WiFi定位可以定期获得位置。这段代码将使您获得使用WiFi定位设备位置的定期更新。
PRIVILEGE需要：http://tizen.org/privilege/location

1. //    PRIVILEGE needed to be set in tizen-manifest.xml:
   
2. //    http://tizen.org/privilege/location
   
3. 
   
4. #include <locations.h>
   
5. #include <dlog.h> // for logging purposes
   
6. 
   
7. // Declaring location Manager (in this example it is a global variable):
   
8. location_manager_h location_manager;
   
9. 
   
10. // Defining callback function for location update
    
11. // The callback will be called periodically, as defined during callback registration.
    
12. void position_updated_cb(double latitude, double longitude, double altitude, time_t timestamp, void *user_data)
    
13. {
    
14.     LOGI("Location update: Latitude: %f, Longitude: %f, timestamp: %d", latitude, longitude, timestamp);
    
15. }
    
16. 
    
17. // On startup of your service:
    
18. 
    
19. void startup()
    
20. {
    
21.     // Creating location manager for WiFi Positioning System
    
22.     // The LOCATIONS_METHOD_WPS setting means that this location manager will use
    
23.     // only WiFi networks to check the device's location.
    
24.     if(location_manager_create(LOCATIONS_METHOD_WPS, &location_manager) == LOCATIONS_ERROR_NONE)
    
25.     {
    
26.         LOGI("Location manager created.");
    
27.         // Setting callback for position update - update will be done every 15 seconds.
    
28.         if (location_manager_set_position_updated_cb(location_manager, position_updated_cb, 15, NULL) == LOCATIONS_ERROR_NONE)
    
29.         {
    
30.             LOGI("Location position update callback added.");
    
31.         }
    
32.         // Starting service
    
33.         if(location_manager_start(location_manager)== LOCATIONS_ERROR_NONE)
    
34.         {
    
35.             LOGI("Location service started.");
    
36.         }
    
37.     }
    
38. }
    
39. 
    
40. // On shutdown of your service:
    
41. 
    
42. void shutdown()
    
43. {
    
44.     //unset the callback
    
45.     if (location_manager_unset_position_updated_cb(location_manager) == LOCATIONS_ERROR_NONE)
    
46.     {
    
47.         LOGI("Callback unregistered.");
    
48.     }
    
49.     // It is not necessary to call location_manager_stop() just before calling
    
50.     // location_manager_destroy because the service is stopped automatically
    
51.     // before destruction.
    
52.     if (location_manager_destroy(location_manager) == LOCATIONS_ERROR_NONE)
    
53.     {
    
54.         LOGI("Location manager destroyed.");
    
55.     }
    
56.     location_manager = NULL;
    
57. }

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