Re: Need to find out why I get Cocoa error 256 . . . (more info)

[Michael A. Crawford]

When I change the persistent-store type from SQLite to Binary, my code works. I'm able to save the Managed Object Context. On the next run, my fetch works because there is not data in the persistent store. Anyone have any idea why the store type makes the difference?

/**
 Returns the persistent store coordinator for the application.

 */
- (NSPersistentStoreCoordinator*)persistentStoreCoordinator
{
    if ( nil == persistentStoreCoordinator )
    {
#if 0

#else

#endif

        NSError *error;

#if 0

#else

#endif
        {
            // Handle error
            NSLog(@"Error adding persistent store to coordinator");
        }
    }
    return persistentStoreCoordinator;
}

If the coordinator doesn't already exist, it is created and the application's store added to it. NSURL* storeUrl = [NSURL fileURLWithPath:[[self applicationDocumentsDirectory] stringByAppendingPathComponent:@"SpecialOrders.sqlite"]]; NSURL* storeUrl = [NSURL fileURLWithPath:[[self applicationDocumentsDirectory] stringByAppendingPathComponent:@"SpecialOrders.bin"]]; persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:[self managedObjectModel]]; if ( ![persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeUrl options:nil error:&error] ) if ( ![persistentStoreCoordinator addPersistentStoreWithType:NSBinaryStoreType configuration:nil URL:storeUrl options:nil error:&error] )

#pragma mark -
#pragma mark AppController methods

- (void)viewDidLoad
{
  [super viewDidLoad];

        // Set up the edit and add buttons.
  self.navigationItem.leftBarButtonItem = self.editButtonItem;


  self.navigationItem.rightBarButtonItem = addButton;
  [addButton release];
        
        NSError *error;

        if ( ![[self fetchedResultsController] performFetch:&error] )
  {
                // Handle the error...
      NSLog(@"Failed to perform initial fetch for view");
        }

  //

  // the model objects.
  //


  if ( (nil == fetchedObjects) || (0 == fetchedObjects.count) )
  {
      NSLog(@"Nothing returned from fetch; creating dummy objects");


      language.name = @"English";
      language.symbol = @"EN";


      publication.ID = [NSNumber numberWithInt:5334];
      publication.languages = [NSSet setWithObject:language];
      publication.name = @"Bible Teach";
      publication.symbol = @"bh";

      language.publications = [NSSet setWithObject:publication];


      publisher.firstName = @"Michael";
      publisher.lastName = @"Crawford";


      request.language    = language;
      request.publication = publication;
      request.publisher   = publisher;
      request.timeStamp   = [NSDate date];

      publisher.requests = [NSSet setWithObject:request];
      publication.requests = [NSSet setWithObject:request];


      order.ID = [NSNumber numberWithInt:1];
      order.requests = [NSSet setWithObject:request];
      order.timeStamp = [NSDate date];

      request.order = order;

      NSLog(@"language = %@", language);
      NSLog(@"publication = %@", publication);
      NSLog(@"publisher = %@", publisher);
      NSLog(@"request = %@", request);
      NSLog(@"order = %@", order);

      NSError* error;


      {
          NSLog(@"Failed to save context with new data: %@", error);
      }

      [self.tableView reloadData];
  }
}

UIBarButtonItem* addButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:@selector(insertNewObject)]; // If the fetch resulted in no records, create and save instances of each of NSArray* fetchedObjects = [[self fetchedResultsController] fetchedObjects]; Language* language = [NSEntityDescription insertNewObjectForEntityForName:@"Language" inManagedObjectContext:self.managedObjectContext]; Publication* publication = [NSEntityDescription insertNewObjectForEntityForName:@"Publication" inManagedObjectContext:self.managedObjectContext]; Publisher* publisher = [NSEntityDescription insertNewObjectForEntityForName:@"Publisher" inManagedObjectContext:self.managedObjectContext]; Request* request = [NSEntityDescription insertNewObjectForEntityForName:@"Request" inManagedObjectContext:self.managedObjectContext]; Order* order = [NSEntityDescription insertNewObjectForEntityForName:@"Order" inManagedObjectContext:self.managedObjectContext]; if ( ![[fetchedResultsController managedObjectContext] save:&error] )

-Michael
----------------------


-- C.A.R. Hoare


On Apr 13, 2009, at 10:25 AM, Michael A. Crawford wrote:

There are two ways of constructing a software design. One way is to make it so simple that there are obviously no deficiencies. And the other way is to make it so complicated that there are no obvious deficiencies.

Where can I find detail on the following error code? Or, can someone point me to information on how to effectively debug a failure for a CoreData -[NSManagedObjectContext save] invocation?

-Michael_______________________________________________

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2009-04-13 10:17:28.625 SpecialOrders[4923:20b] Failed to save context with new data: Error Domain=NSCocoaErrorDomain Code=256 UserInfo=0xf4b150 "Operation could not be completed. (Cocoa error 256.)"

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