语法：

achievement_load_friends()

返回：

N/A（无返回值）

描述

This function will send a request to the server for information on all the logged in users friends and will trigger a callback Social Asynchronous Event which contains the async_load map populated with the relevant key/value pairs. The id key of this ds_map is used to identify the correct callback (there can be more than one trigger function for any given asynchronous event), and will be paired with the constant achievement_friends_info as well as a number of other key/value pairs for each friend. The exact contents of the map are shown below:

1. "id" - For this function it should be achievement_friends_info
   
   
2. "FriendN" - The name of the friend, where "N" is an integer value corresponding to their position within the friends list.
   
   
3. "FriendidN" - The unique user id of the friend, "N".

NOTE: This function is for iOS only.

Extended 举例：

The following code would probably be called after the player has logged into their game account using achievement_login to get a list of all that users friends:

achievement_friends_info();

This will send off a request for the information on the users friends and generate an asynchronous callback with the special async_load ds_map containing the following data:

var ident = ds_map_find_value(async_load, "id");
if ident == achievement_friends_info
   {
   var numfriends = ds_map_find_value(async_load, "numfriends");
   global.numfriends = numfriends;
   for(var i=0; i < numfriends; i++;)
      {
      global.friendname[i] = ds_map_find_value(async_load, "Friend" + string(i));
      global.friendid[i] = ds_map_find_value(async_load, "Friendid" + string(i));
      achievement_get_pic(global.friendid[i]);
      }
   }

The above code checks the returned ds_map in the Social Asynchronous Event and if its "id" matches the constant being checked, it then loops through the map storing all the different values in a number of arrays and requests an image for each of the entries in the map (see achievement_get_pic).