iOS Facebook SDK - 收到朋友的电子邮件

Question

我开发一个iPhone应用程序,我希望能够列出谁连接到我的应用程序和访问他们的电子邮件,如果他们已经给予我到他们的电子邮件应用程序访问用户的好友.

这是我用来打开Facebook会话的代码:

    - (BOOL)openSessionWithAllowLoginUI:(BOOL)allowLoginUI {

     NSArray *permissions = [[NSArray alloc] initWithObjects:
                    @"email",
                    nil];

    return [FBSession openActiveSessionWithReadPermissions:permissions
                                      allowLoginUI:allowLoginUI
                                 completionHandler:^(FBSession *session,
                                                     FBSessionState state,
                                                     NSError *error) {
                                     [self sessionStateChanged:session
                                                         state:state
                                                         error:error];
                                 }];
}

此外,在ViewController.m中,我使用以下代码列出朋友并获取他们的电子邮件:

    NSString *query =
         [NSString stringWithFormat:@"SELECT name, uid, pic_small, birthday,proxied_email, contact_email , email FROM user WHERE is_app_user = 1 and uid IN (SELECT uid2 FROM friend where uid1 = %@) order by concat(first_name,last_name) asc", my_fb_uid ];

        // Set up the query parameter
       NSDictionary *queryParam =
      [NSDictionary dictionaryWithObjectsAndKeys:query, @"q", nil];
       // Make the API request that uses FQL

    [FBRequestConnection startWithGraphPath:@"/fql"
                         parameters:queryParam
                         HTTPMethod:@"GET"
                  completionHandler:^(FBRequestConnection *connection,
                                      id result,
                                      NSError *error) {
                      if (error) {
                          NSLog(@"Error: %@", [error localizedDescription]);
                      } else {
                          NSLog(@"Result: %@", result);
                      }
                  }];  

问题是返回的电子邮件总是为空,即使对于安装我的应用程序并授权其访问其电子邮件的朋友也是如此.

有什么建议吗？

Answer 1

从文档:

Note: There is no way for apps to obtain email addresses for a user's friends.

该email权限仅适用于logged_in用户