如何通过iPhone应用程序向Facebook中的朋友发送朋友请求？

有没有办法通过iPhone应用程序发送好友请求？如果有，请帮助我。我在网上搜索过，但我没有得到解决方案。

Is there any way to send friend request through iPhone application? if yes, please help me. I've searched in web but I didn't get solution.

我收到以下代码发送应用请求不发送好友请求

I got the following code to send app request not to send friend request

 NSMutableDictionary *variables = [NSMutableDictionary dictionaryWithCapacity:4];
[variables setObject:[NSString stringWithFormat:@"Come and join XYZ App."] forKey:@"message"];
[variables setObject:@"url" forKey:@"picture"];       
[variables setObject:@"Hello" forKey:@"name"];
[variables setObject:@"Description" forKey:@"description"];

[_facebook requestWithGraphPath:[NSString stringWithFormat:@"/%@/feed",facebook_user_id] 
                      andParams:variables 
                  andHttpMethod:@"POST"
                    andDelegate:self];

请帮帮我。