Xcode: requestDidLoad FB Graph API doesn't get loaded

Discussion in 'iOS Programming' started by kikovi, Aug 30, 2011.

  1. kikovi macrumors newbie

    Joined:
    Aug 30, 2011
    #1
    I'm experiencing the next issue:

    I have 3 classes that are taking data from Facebook API and are communicating through delegating. First class takes my friends, then for each friend 2nd class calls friend's events, return them and then for each friend's event, 3rd class calls event's ID to get full event infos. This is where the issue comes in, after calling 3rd class, the fb request api gets executed (requestLoading function gets started) but it doesn't wait in that class to get reply but just jumps out of the class.

    Here is the code:
    Code:
        // Class 1:
        // calling friends in first class
        - (void) callFriendData
        {
        PicShowAppDelegate* appDelegate = (PicShowAppDelegate*)[[UIApplication sharedApplication] delegate];
    	Facebook *facebook = appDelegate.facebook;
        [facebook requestWithGraphPath:@"me/friends" andDelegate:self];
        }
    
        // receiving friends + calling friend class for each friend in which we will call events
        - (void)request:(FBRequest *)request didLoad:(id)result {
        NSMutableArray *data = [result objectForKey:@"data"];
        NSMutableArray *tmpFriendID = [data valueForKey:@"id"];
        NSMutableArray *tmpFriendName = [data valueForKey:@"name"];
        for(int i=0;i<[tmpFriendID count];i++)
        {
            FBFriend *fbFriend = [[FBFriend alloc]init];
            [fbFriend setDelegate:self];
            fbFriend.friendID = [tmpFriendID objectAtIndex:i];
            fbFriend.friendName = [tmpFriendName objectAtIndex:i];
            [fbFriend takeEvents];
            
            [friendDataArray addObject:fbFriend];
            [fbFriend release];
        }
        }
    
        // class 2, friend, here I call events
    
        - (void) takeEvents
        {
        PicShowAppDelegate* appDelegate = (PicShowAppDelegate*)[[UIApplication sharedApplication] delegate];
    	Facebook *facebook = appDelegate.facebook;
        [facebook requestWithGraphPath:[NSString stringWithFormat:@"%@/events",self.friendID] andDelegate:self];
        }
    
        // receiving events for certain user
        - (void)request:(FBRequest *)request didLoad:(id)result {
        ....
        
        // sending events back to 1st class
        [[self delegate] eventsTaken:eventIDs fromFriendID:self.friendID];
        }
    
        // first class receives events for certain user, finds where he has to put them, and does so and then calls 3rd class, event
        - (void) eventsTaken: (NSArray *)idEvents  fromFriendID: (NSString*) idFrenda
        {
        
        for(int i=0;i<[friendDataArray count];i++)
            if([[[friendDataArray objectAtIndex:i] valueForKey:@"friendID"] isEqual:idFrenda])
                for(int j=0;j<[idEvents count];j++)
                {
                    Event *event = [[Event alloc] init];
                    event.eventID=[idEvents objectAtIndex:j];
                    [event takeEvent];
                    
                    [event release];
                }
        }
    
        // 3rd class, event
        -(void) takeEvent
        {
        PicShowAppDelegate* appDelegate = (PicShowAppDelegate*)[[UIApplication sharedApplication] delegate];
    	Facebook *facebook = appDelegate.facebook;
        [facebook requestWithGraphPath:[NSString stringWithFormat:@"%@",self.eventID] andDelegate:self];
        
        }
    
        // HERE IT FAILS, THIS NEVER GETS CALLED -> ??
        - (void)request:(FBRequest *)request didLoad:(id)result {
        ....
        }
    
     
  2. ianray macrumors 6502

    Joined:
    Jun 22, 2010
    Location:
    @
    #2
    Have you used NSLog statements to confirm the program flow?

    Have you implemented the following?

    Code:
    - (void)request:(FBRequest *)request didReceiveResponse:(NSURLResponse *)response {
        NSLog(@"request:didReceiveResponse:");
    }
    
    - (void)request:(FBRequest *)request didFailWithError:(NSError *)error {
        NSLog(@"request:didFailWithError:%@:%d", error.domain, error.code);
    }
    
    The first step in debugging is always to get facts about program flow and error conditions. Hope this helps :)
     
  3. kikovi thread starter macrumors newbie

    Joined:
    Aug 30, 2011
    #3
    Hello, thanks for reply. :)

    Yes I have implanted all those functions and they just don't get called, only requestLoading does. I ve set NSLogs everywhere and still can't identify the issue, this one is a hard one. :(
     
  4. idelovski, Sep 1, 2011
    Last edited: Sep 1, 2011

    idelovski macrumors regular

    Joined:
    Sep 11, 2008
    #4
    This is wrong:

    Code:
       NSMutableArray *data = [result objectForKey:@"data"];
       NSMutableArray *tmpFriendID = [data valueForKey:@"id"];
       NSMutableArray *tmpFriendName = [data valueForKey:@"name"];
    
    In the first line you'll get array of dictionaries, so you need an -objectAtIndex: at some place. Something like this:

    Code:
       NSArray       *data = [result objectForKey:@"data"];
       NSDictionary  *person = [data objectAtIndex:0];  // or in a loop
          
       NSString  *name = [person objectForKey:@"name"];
       NSString  *friendId = [person objectForKey:@"id"];
    And you need to check everything you get from the server. Use isKindOfClass: on almost anything you get as response and check if it's nil.

    Today I had a crash with the code that handles friends icons. My code would receive all the images except one, and then I had a crash. In debugger I found the reason, I got something useless as a result so -imageWithData: returned nil and in the next line I tried to put it into a dictionary so I had a crash. Well, now I check and if I don't get the proper image I just repeat request and this way all seem work out fine. At least, until I stumble upon something else.
     
  5. kikovi, Sep 1, 2011
    Last edited: Sep 2, 2011

    kikovi thread starter macrumors newbie

    Joined:
    Aug 30, 2011
    #5
    I don't think I need objectAtIndex since valueForKey:mad:"id" automatically checks all the objects and take their IDs into an array.

    I ve added some isKindOfClass to reduce errors in future, but the problem remais. The issue is that the requestDidLoad doesn't even get loaded, I can't even po result in the debugger. The ID for event sent in request is correct - checked in Facebook graph api. Any more ideas what is going on?
     
  6. idelovski, Sep 2, 2011
    Last edited: Sep 2, 2011

    idelovski macrumors regular

    Joined:
    Sep 11, 2008
    #6
    > I don't think I need objectAtIndex since valueForKey:mad:"id" automatically checks all the objects and take their IDs into an array.

    Oh, oh. TIL that you can get values from array of dictionaries this way. This is so cool. I'm sure I'll need that trick one of these days.

    > The issue is that the requestDidLoad doesn't even get loaded...

    Put breakpoints in FBRequest.m in SDK, maybe in -connection:didReceiveResponse: and related delegate methods. Then inside -handleResponseData: and maybe -serializeURL: to see what url string do you have.
     
  7. kikovi thread starter macrumors newbie

    Joined:
    Aug 30, 2011
    #7
    Fixed, shouldn't release album so early.. Thanks for help everyone, though.
     

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