Getting EXC_BAD_ACCESS without any useful messages from NSZombieEnabled

Question

I am new to iphone development and I was struggling with the EXC_BAD_ACCESS error that I received a couple of days ago. I mainly do the Stanford iphone class myself, and I'm trying to pass an array of NSManagedObjects to a TableViewController that should display them. The application runs in the simulator and displays the data in the View table, but immediately eliminates errors using EXC_BAD_ACCESS.

I have followed instructions here and elsewhere on how to use NSZombieEnabled to identify prematurely released objects, but this code does not contain any useful messages even with NSZombieEnabled. I guess this should be caused by something trying to access unassigned memory that was not released through release / autorelease. Or it would be perceived as a zombie object, like other errors that I could fix. I am not an expert c, but does this mean that this can happen if I have to declare an object and send it a message without creating it? I looked through my code to find out if I have something like this, and I went up to it.

I have a stack trace in the debugger for this, but I'm not sure how to use it. I'm a little upset because I can't use breakpoints in the code to narrow down the problem further, since it seems to happen after the application finishes loading. I thought that the application would simply remain idle if there was no user interaction. Is this a failure in the tail of the download, where I cannot easily see it, or do something in the background after loading. And I would really appreciate any advice on how to read stacktrace for this.

I printed my glass below (I could not figure out how to copy it from the debugger)

0 objc_msgSend
1 ??
2 -[NSManagedObject dealloc]
3 -[_PFManagedObjectReferenceQueue _processReferenceQue:]
4 _performRunLoopAction
5 ___CFRunLoopDoObservers
6 CFRunLoopRunSpecific
7 CFRunLoopRunInMode
8 GSEventRunModal
9 GSEventRun
10 UIApplicationMain
11 main

And the two main classes in my program are the top-level delegate class and the ViewTableController it calls.

`- (void) applicationDidFinishLaunching: (UIApplication * application) {

self.tabBarController = [[[UITabBarController alloc] init] autorelease];        

UINavigationController *contactsNavigationController = [[self createContactsNavigationController] retain];

//UINavigationController *recentsNavigationController = [[self createRecentsNavigationController:photos] retain];

tabBarController.viewControllers = [[NSArray alloc] initWithObjects: contactsNavigationController, nil];

[contactsNavigationController release];
//[recentsNavigationController release];

[window addSubview:tabBarController.view];
    [window makeKeyAndVisible];

}

- (UINavigationController *) createContactsNavigationController {

UINavigationController *contactsNavigationController = [[UINavigationController alloc] init];

UITabBarItem *contactsTabBarItem = [[UITabBarItem alloc] initWithTabBarSystemItem: UITabBarSystemItemContacts tag:0];
contactsNavigationController.tabBarItem=contactsTabBarItem ;
[contactsTabBarItem  release];


PersonListViewController *personListViewController = [[PersonListViewController alloc] initWithStyle:UITableViewStylePlain];    

NSManagedObjectContext *context = [self managedObjectContext];
personListViewController.managedObjectContext=context;

personListViewController.contacts = [self createContacts];
[context release];

personListViewController.title=@"Contacts";

[contactsNavigationController pushViewController:personListViewController animated:false];
return [contactsNavigationController autorelease];

} `

`- (NSArray *) readContacts {

NSString *path = [[NSBundle mainBundle] bundlePath];

NSString *filePath = [path stringByAppendingPathComponent:@"FakeData.plist"];
NSArray *plist = [[NSMutableArray arrayWithContentsOfFile:filePath] retain];

return [plist autorelease];
}

- (NSMutableArray *)createContacts {

NSArray * plist = [[self readContacts] retain
NSMutableArray *contactNames = [[NSMutableArray alloc] init];
NSMutableArray *contacts = [[NSMutableArray alloc] init];
for (NSDictionary *photo in plist) {
    NSString *contactName = [photo objectForKey:@"user"];
    Person *contact = nil;
    if (![contactNames containsObject:contactName]) {
        contact  = (Person *)[NSEntityDescription insertNewObjectForEntityForName:@"Person" inManagedObjectContext:managedObjectContext];
        contact.name =contactName;
        NSError *error;
        if (![managedObjectContext save:&error]) {
            NSLog(@"SHIT the save person FAILED!!!  %@",error);
        }

        [contacts addObject:contact];
        [contactNames addObject:contactName];



    } else {
        contact = [contacts objectAtIndex:[contactNames indexOfObject:contactName]];
    }

    [contactName release];

    Photo *image = (Photo *)[NSEntityDescription insertNewObjectForEntityForName:@"Photo" inManagedObjectContext:managedObjectContext];

    image.imageFile = [photo objectForKey:@"path"];
    image.imageName = [photo objectForKey:@"name"];
    image.owner = contact;

    contact.photos = [NSSet setWithObjects:image,nil];


     NSError *error;
     if (![managedObjectContext save:&error]) {
         NSLog(@"SHIT the save photoFAILED!!!  %@",error);
     }

    [image release];
    [contact release];
}

[plist release];

return [contacts autorelease];
}

, , .

.

Answer 1

:

NSString *contactName = [photo objectForKey:@"user"];
... a bunch of lines later
[contactName release];

objectForKey: autoreleased, .

, insertNewObjectForEntityForName:inManagedObjectContext:managedObjectContext autoreleased, [image release] [contact release]

Answer 2

EXC_BAD_ACCESS - , NSzombieEnabled . , :

. , , .

, , EXC_BAD_ACCESS , xib . View Controller MainWindow.xib NIB Name. .