Getting Facebook Username in iPhone App - iphone

Question

How can I get the username once anyone is logged in to facebook through my app ?
I am using :-
FBConnect API.
My Controller.m file-
#import "FacebookPOCViewController.h"
#implementation FacebookPOCViewController
#synthesize session = _session;
#synthesize logoutButton = _logoutButton;
#synthesize loginDialog = _loginDialog;
#synthesize facebookName = _facebookName;
- (void)viewDidLoad {
//PayTai Facebook App
static NSString* kApiKey = #"230600000000";
static NSString* kApiSecret = #"----------------------";
_session = [[FBSession sessionForApplication:kApiKey secret:kApiSecret delegate:self] retain];
// Load a previous session from disk if available. Note this will call session:didLogin if a valid session exists.
[_session resume];
[super viewDidLoad];
}
- (IBAction)loginTapped:(id)sender {
//_posting = YES;
// If we're not logged in, log in first...
if (![_session isConnected]) {
self.loginDialog = nil;
_loginDialog = [[FBLoginDialog alloc] init];
[_loginDialog show];
}
// If we have a session and a name, post to the wall!
else if (_facebookName != nil) {
//[self postToWall];
printf("Session");
}
// Otherwise, we don't have a name yet, just wait for that to come through.
}
- (IBAction)logoutButtonTapped:(id)sender {
[_session logout];
}
#pragma mark FBSessionDelegate methods
- (void)session:(FBSession*)session didLogin:(FBUID)uid {
[self getFacebookName];
}
- (void)session:(FBSession*)session willLogout:(FBUID)uid {
_logoutButton.hidden = YES;
_facebookName = nil;
}
pragma mark Get Facebook Name Helper
- (void)getFacebookName {
NSString* fql = [NSString stringWithFormat:#"select uid,name from user where uid == %lld", _session.uid];
//NSLog(#"%#",_session.uid);
NSDictionary* params = [NSDictionary dictionaryWithObject:fql forKey:#"query"];
[[FBRequest requestWithDelegate:self] call:#"facebook.fql.query" params:params];
}
#pragma mark FBRequestDelegate methods
- (void)request:(FBRequest*)request didLoad:(id)result {
if ([request.method isEqualToString:#"facebook.fql.query"]) {
NSArray* users = result;
NSDictionary* user = [users objectAtIndex:0];
NSString* name = [user objectForKey:#"name"];
self.facebookName = name;
_logoutButton.hidden = NO;
[_logoutButton setTitle:[NSString stringWithFormat:#"Logout as %#", name] forState:UIControlStateNormal];
//if (_posting) {
// [self postToWall];
// _posting = NO;
// }
}
}

Answer 1

Take a look at this. You can get almost any info of the user with the GRAPH api.
http://developers.facebook.com/docs/reference/api/user/
Example
/**
* Request the facebook name for the user
* Response will be obtained on delegate
*/
- (void) getFacebookName {
[facebook requestWithGraphPath:#"me?fields=id,name" andDelegate:self];
}
#pragma mark - FBRequestDelegate methods
- (void)request:(FBRequest *)request didLoad:(id)result {
NSLog(#"Result: %#", result);
NSDictionary *userInfo = (NSDictionary *)result;
userName = [userInfo objectForKey:#"name"];
fb_id = [userInfo objectForKey:#"id"];
}