Question

I have a problem with implementing Facebook posting on wall in my iPhone application.
I installed SDK and linked framework
login is working fine. here’s the code:

-(IBAction)loginButtonPressed:(id)sender
{
    NSLog(@"loginButtonPressed: called");

    AppDelegate *appdel=[[UIApplication sharedApplication] delegate];
    appdel.facebookSession=[[FBSession alloc] init];
    [appdel.facebookSession openWithCompletionHandler:^(FBSession *session, 
                                                     FBSessionState status, 
                                                     NSError *error)
    {
        //
    }];
}

But I have a problem with posting message on user’s wall. Here’s the code:

-(IBAction)likeButtonPressed:(id)sender
{
    NSLog(@"likeButtonPressed: called");
    // Post a status update to the user's feedm via the Graph API, and display an alert view 
    // with the results or an error.

    NSString *message = @"test message";
    NSDictionary *params = [NSDictionary dictionaryWithObject:message forKey:@"message"];

    // use the "startWith" helper static on FBRequest to both create and start a request, with
    // a specified completion handler.
    [FBRequest startWithGraphPath:@"me/feed"
                       parameters:params
                       HTTPMethod:@"POST"
                completionHandler:^(FBRequestConnection *connection, id result, NSError *error) {

                    [self showAlert:message result:result error:error];
                }];

}

Help me please. What’s wrong with my code? Or should I add some permissions to login request?

Answer 1

this code worked for me.
First we must

#import <FBiOSSDK/FacebookSDK.h>

then

@property (strong, nonatomic) FBRequestConnection *requestConnection;

and of course do not forget to synthesize:

@synthesize requestConnection;

the code itself:

-(IBAction)likeButtonPressed:(id)sender
{
    NSLog(@"likeButtonPressed: called");
    // FBSample logic
    // Check to see whether we have already opened a session.
    if (FBSession.activeSession.isOpen)
    {
        // login is integrated with the send button -- so if open, we send
        [self postOnWall];
    }
    else
    {
        [FBSession sessionOpenWithPermissions:[NSArray arrayWithObjects:@"publish_stream", nil]
                                completionHandler:
             ^(FBSession *session, 
               FBSessionState status, 
               NSError *error)
            {
                 // if login fails for any reason, we alert
                 if (error)
                 {
                     NSLog(@"    login failed");
                     UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error"
                                                                     message:error.localizedDescription
                                                                    delegate:nil
                                                           cancelButtonTitle:@"OK"
                                                           otherButtonTitles:nil];
                     [alert show];
                     // if otherwise we check to see if the session is open, an alternative to
                     // to the FB_ISSESSIONOPENWITHSTATE helper-macro would be to check the isOpen
                     // property of the session object; the macros are useful, however, for more
                     // detailed state checking for FBSession objects
                 }
                 else if (FB_ISSESSIONOPENWITHSTATE(status))
                 {
                     NSLog(@"    sending post on wall request...");
                     // send our requests if we successfully logged in
                     [self postOnWall]; 
                 }
             }];
    };
}

- (void)postOnWall
{
    NSNumber *testMessageIndex=[[NSNumber alloc] init];
    if ([[NSUserDefaults standardUserDefaults] objectForKey:@"testMessageIndex"]==nil)
    {
        testMessageIndex=[NSNumber numberWithInt:100];
    }
    else
    {
        testMessageIndex=[[NSUserDefaults standardUserDefaults] objectForKey:@"testMessageIndex"];
    };
    testMessageIndex=[NSNumber numberWithInt:[testMessageIndex intValue]+1];
    [[NSUserDefaults standardUserDefaults] setObject:testMessageIndex forKey:@"testMessageIndex"];
    [[NSUserDefaults standardUserDefaults] synchronize];

    // create the connection object
    FBRequestConnection *newConnection = [[FBRequestConnection alloc] init];

    // create a handler block to handle the results of the request for fbid's profile
    FBRequestHandler handler =
    ^(FBRequestConnection *connection, id result, NSError *error) {
        // output the results of the request
        [self requestCompleted:connection forFbID:@"me" result:result error:error];
    };

    // create the request object, using the fbid as the graph path
    // as an alternative the request* static methods of the FBRequest class could
    // be used to fetch common requests, such as /me and /me/friends
    NSString *messageString=[NSString stringWithFormat:@"wk test message %i", [testMessageIndex intValue]];
    FBRequest *request=[[FBRequest alloc] initWithSession:FBSession.activeSession graphPath:@"me/feed" parameters:[NSDictionary dictionaryWithObject:messageString forKey:@"message"] HTTPMethod:@"POST"];

    // add the request to the connection object, if more than one request is added
    // the connection object will compose the requests as a batch request; whether or
    // not the request is a batch or a singleton, the handler behavior is the same,
    // allowing the application to be dynamic in regards to whether a single or multiple
    // requests are occuring
    [newConnection addRequest:request completionHandler:handler];

    // if there's an outstanding connection, just cancel
    [self.requestConnection cancel];

    // keep track of our connection, and start it
    self.requestConnection = newConnection;    
    [newConnection start];
}

// FBSample logic
// Report any results.  Invoked once for each request we make.
- (void)requestCompleted:(FBRequestConnection *)connection
                 forFbID:fbID
                  result:(id)result
                   error:(NSError *)error
{
    NSLog(@"request completed");

    // not the completion we were looking for...
    if (self.requestConnection &&
        connection != self.requestConnection)
    {
        NSLog(@"    not the completion we are looking for");
        return;
    }

    // clean this up, for posterity
    self.requestConnection = nil;

    if (error)
    {
        NSLog(@"    error");
        UIAlertView *alert=[[UIAlertView alloc] initWithTitle:@"error" message:error.localizedDescription delegate:nil cancelButtonTitle:@"OK" otherButtonTitles: nil];
        // error contains details about why the request failed
        [alert show];
    }
    else
    {
        NSLog(@"   ok");        
    };
}