How to retrieve username for facebook from sharekit in iphone sdk

Question

I am creating an app for Facebook and twitter integration using sharekit. That works fine. But now I want to retrieve the username and password for facebook login. I followed this link.

But I am not able to retrieve these..

I can't understand how can use that method and where can i use to retrieve username and password

Can you please guide me if you know.

Answer 1

First of all, you can't retrieve a user's Facebook password. Hopefully the reasons for this are obvious.

You can, however, retrieve the access token that your app is granted once you connect your app to a user's Facebook account using ShareKit.

As of this writing, I don't believe ShareKit makes the access token accessible directly, but there's an easy hack to retrieve it.

Step 1: Ensure that you're app is authorized to connect to Facebook

BOOL isConnected = [SHKFacebook isServiceAuthorized];

If you get isConnected == NO here, your UI should indicate that the user needs to connect to Facebook to use your sharing features.

Step 2: Get the access token in order to access the user's Facebook data

Assuming you got isConnected == YES in step 1

// Hack into ShareKit's user defaults
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSString *accessToken = [defaults valueForKey:@"kSHKFacebookAccessToken"];

Step 3: Bypass ShareKit and make a custom query to the Facebook SDK

Assuming a property in your class such as this one...

// Change "strong" to "retain" if not using ARC
@property (nonatomic, strong) SHKFacebook *shkFb; 

...you can start a Facebook query with something like this...

    if ( !fb ) {
        // This is how SHKFacebook instantiates a Facebook object. YMMV.
        self.fb = [[Facebook alloc] initWithAppId:SHKCONFIG(facebookAppId)];
    }

    NSMutableDictionary *fbParams = [NSMutableDictionary dictionaryWithObjectsAndKeys:
                                     @"name", @"fields",
                                     accessToken, @"access_token",
                                     nil];
    [fb requestWithGraphPath:@"me" andParams:fbParams andDelegate:self];

Step 4: Implement the Facebook delegate methods

Once the Facebook query's done, it'll notify your object, at which point you can do fancy things such as display the user's name to make it clear whose wall will get posts sent from your app.

You'll need to declare the FBRequestDelegate protocol in your .h, of course:

#import "Facebook.h"

@interface YourClass : NSObject <FBRequestDelegate>

And you'll need to implement (minimally) the success and failure methods from FBRequestDelegate:

#pragma mark - FBRequestDelegate

- (void)request:(FBRequest *)request didLoad:(id)result {

    // Additional keys available in "result" can be found here:
    // https://developers.facebook.com/docs/reference/api/user/ 
    NSString *username = [result objectForKey:@"name"];

    // Localize if you're at all interested in the global app market!
    NSString *localizedString = NSLocalizedString(@"connected as %@",
                                                  @"Connection status label");

    // The label will read "connected as <username>"
    self.statusLabel.text = [NSString stringWithFormat:localizedString, username];
}

- (void)request:(FBRequest *)request didFailWithError:(NSError *)error {
    // Handle failure

    // (In our app, we call [SHKFacebook logout]
    // and display an error message to the user with
    // an option to retry connecting to Facebook.)
}