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The operation could not be completed. (Cocoa error 512.) Coredata Iphone. Files cannot be copied to the document folder

I am working on a coredata project in xcode 4.3 for ios 5.1. I created an empty ARC project with the CoreData checkbox selected, following the add by xcode methods to control the model and change me according to the guide for copying preopulate sqllite db to my application, prepulate db is in the resource group inside the project folder and has the same thing name of model and project.

- (void)saveContext { NSError *error = nil; NSManagedObjectContext *managedObjectContext = self.managedObjectContext; if (managedObjectContext != nil) { if ([managedObjectContext hasChanges] && ![managedObjectContext save:&error]) { // Replace this implementation with code to handle the error appropriately. // abort() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development. NSLog(@"Unresolved error %@, %@", error, [error userInfo]); abort(); } } } #pragma mark - Core Data stack // Returns the managed object context for the application. // If the context doesn't already exist, it is created and bound to the persistent store coordinator for the application. - (NSManagedObjectContext *)managedObjectContext { if (_managedObjectContext != nil) { return _managedObjectContext; } NSPersistentStoreCoordinator *coordinator = [self persistentStoreCoordinator]; if (coordinator != nil) { _managedObjectContext = [[NSManagedObjectContext alloc] init]; [_managedObjectContext setPersistentStoreCoordinator:coordinator]; } return _managedObjectContext; } // Returns the managed object model for the application. // If the model doesn't already exist, it is created from the application model. - (NSManagedObjectModel *)managedObjectModel { if (_managedObjectModel != nil) { return _managedObjectModel; } NSURL *modelURL = [[NSBundle mainBundle] URLForResource:@"Prova1" withExtension:@"momd"]; NSLog(@"modelURL %@",modelURL); _managedObjectModel = [[NSManagedObjectModel alloc] initWithContentsOfURL:modelURL]; return _managedObjectModel; } // Returns the persistent store coordinator for the application. // If the coordinator doesn't already exist, it is created and the application store added to it. - (NSPersistentStoreCoordinator *)persistentStoreCoordinator { if (_persistentStoreCoordinator != nil) { return _persistentStoreCoordinator; } NSString *storePath = [[[self applicationDocumentsDirectory] absoluteString] stringByAppendingPathComponent:@"Prova1.sqlite"]; NSLog(@"storePath %@",storePath); NSURL *storeURL = [NSURL fileURLWithPath:storePath]; NSLog(@"storeURL %@",storeURL); // Put down default db if it doesn't already exist NSFileManager *fileManager = [NSFileManager defaultManager]; if (![fileManager fileExistsAtPath:storePath]) { NSString *defaultStorePath = [[NSBundle mainBundle] pathForResource:@"Prova1" ofType:@"sqlite"]; if (defaultStorePath) { [fileManager copyItemAtPath:defaultStorePath toPath:storePath error:NULL]; } }/**/ /*NSURL *storeURL = [[self applicationDocumentsDirectory] URLByAppendingPathComponent:@"Prova1.sqlite"];*/ NSError *error = nil; _persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:[self managedObjectModel]]; if (![_persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeURL options:nil error:&error]) { /* Replace this implementation with code to handle the error appropriately. abort() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development. Typical reasons for an error here include: * The persistent store is not accessible; * The schema for the persistent store is incompatible with current managed object model. Check the error message to determine what the actual problem was. If the persistent store is not accessible, there is typically something wrong with the file path. Often, a file URL is pointing into the application resources directory instead of a writeable directory. If you encounter schema incompatibility errors during development, you can reduce their frequency by: * Simply deleting the existing store: [[NSFileManager defaultManager] removeItemAtURL:storeURL error:nil] * Performing automatic lightweight migration by passing the following dictionary as the options parameter: @{NSMigratePersistentStoresAutomaticallyOption:@YES, NSInferMappingModelAutomaticallyOption:@YES} Lightweight migration will only work for a limited set of schema changes; consult "Core Data Model Versioning and Data Migration Programming Guide" for details. */ NSLog(@"Unresolved error %@, %@", error, [error userInfo]); abort(); } return _persistentStoreCoordinator; } #pragma mark - Application Documents directory // Returns the URL to the application Documents directory. - (NSURL *)applicationDocumentsDirectory { return [[[NSFileManager defaultManager] URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask] lastObject]; }

here instead of implementing a viewcontroller with some field for interacting with db.

 @implementation ALCViewController - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil { self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]; if (self) { // Custom initialization } return self; } - (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view. self.textfied1 = [[UITextField alloc] initWithFrame:CGRectMake(200, 50, 300, 30)]; self.textfied1.borderStyle = UITextBorderStyleRoundedRect; self.textfied1.delegate = self; [self.view addSubview:self.textfied1]; self.textfied2 = [[UITextField alloc] initWithFrame:CGRectMake(200, 100, 300, 30)]; self.textfied2.borderStyle = UITextBorderStyleRoundedRect; self.textfied2.delegate = self; [self.view addSubview:self.textfied2]; self.salvaButton = [UIButton buttonWithType:UIButtonTypeRoundedRect]; [self.salvaButton setFrame:CGRectMake(200, 150, 100, 20)]; [self.salvaButton setTitle:@"salva" forState:UIControlStateNormal]; [self.salvaButton addTarget:self action:@selector(salva:) forControlEvents:UIControlEventTouchDown]; [self.view addSubview:self.salvaButton]; self.cercaButton = [UIButton buttonWithType:UIButtonTypeRoundedRect]; [self.cercaButton setFrame:CGRectMake(200, 200, 100, 20)]; [self.cercaButton setTitle:@"Elenca" forState:UIControlStateNormal]; [self.cercaButton addTarget:self action:@selector(cerca:) forControlEvents:UIControlEventTouchDown]; [self.view addSubview:self.cercaButton]; } - (void)viewDidUnload { [super viewDidUnload]; // Release any retained subviews of the main view. } - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { return (interfaceOrientation == UIInterfaceOrientationPortrait); } - (BOOL)textFieldShouldBeginEditing:(UITextField *)textField { UIToolbar *toolbar = [[UIToolbar alloc] init]; [toolbar setBarStyle:UIBarStyleBlackTranslucent]; [toolbar sizeToFit]; UIBarButtonItem *doneButton = [[UIBarButtonItem alloc] initWithTitle:@"Done" style:UIBarButtonItemStyleDone target:self action:@selector(doneClicked:)]; if ([textField isEqual:self.textfied1]) { [doneButton setTag:1]; } if ([textField isEqual:self.textfied2]) { [doneButton setTag:2]; } [toolbar setItems:[NSArray arrayWithObjects:/*flexibleSpaceLeft,*/ doneButton, nil]]; [textField setInputAccessoryView:toolbar]; [textField setText:@""]; [textField setTextColor:[UIColor blackColor]]; [textField setFont:[UIFont systemFontOfSize:16]];/**/ return YES; } - (void)doneClicked:(id)sender { UIButton *bSender = (UIButton *)sender; switch ([bSender tag]) { case 1: { [self.textfied1 resignFirstResponder]; } break; case 2: { [self.textfied2 resignFirstResponder]; } break; default: break; } } - (void)salva:(id)sender { ALCAppDelegate *appDelegate = [[UIApplication sharedApplication] delegate]; NSManagedObjectContext *context = [appDelegate managedObjectContext]; NSManagedObject *newContact; newContact = [NSEntityDescription insertNewObjectForEntityForName:@"Stica" inManagedObjectContext:context]; [newContact setValue:self.textfied1.text forKey:@"nome"]; [newContact setValue:self.textfied2.text forKey:@"sfiga"]; self.textfied1.text = @""; self.textfied2.text = @""; NSError *error; [context save:&error]; //status.text = @"Contact saved"; } - (void)cerca:(id)sender { ALCAppDelegate *appDelegate = [[UIApplication sharedApplication] delegate]; NSManagedObjectContext *context = [appDelegate managedObjectContext]; NSEntityDescription *entityDesc = [NSEntityDescription entityForName:@"Stica" inManagedObjectContext:context]; NSFetchRequest *request = [[NSFetchRequest alloc] init]; [request setEntity:entityDesc]; /*NSPredicate *pred = [NSPredicate predicateWithFormat:@"(name = %@)", name.text]; [request setPredicate:pred];*/ NSError *error; NSArray *objects = [context executeFetchRequest:request error:&error]; if ([objects count] == 0) { UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Risultati" message:@"Vuoto" delegate:self cancelButtonTitle:@"Ok" otherButtonTitles:nil]; [alert show]; } else { for (NSManagedObject *object in objects) { NSMutableString *string = [[NSMutableString alloc] initWithFormat:@"%@ - %@",[object valueForKey:@"nome"],[object valueForKey:@"sfiga"]]; NSLog(@"%@",string); } } } @end

The problems arise when I try to see the records stored inside the db, actually the error of pressing a button with the name "Elenca", xcode gives me this error:

 Unresolved error Error Domain=NSCocoaErrorDomain Code=512 "The operation couldn't be completed. (Cocoa error 512.)" UserInfo=0x6e7a120 { reason=Failed to create file; code = 2 }, { reason = "Failed to create file; code = 2"; }

I also tried to output some variables:

storePath file : /localhost/Users/winimac01/Library/Application%20Support/iPhone%20Simulator/5.1/Applications/7733DC6C-CE52-4EB4-9A60-26962F7AEDD9/Documents/Prova1.sqlite

storeURL : /localhost/Users/winimac01/Library/Application%2520Support/iPhone%2520Simulator/5.1/Applications/7733DC6C-CE52-4EB4-9A60-26962F7AEDD9/Documents/Prova1.sqlite - - file: // localhost /

modelURL file: //localhost/Users/winimac01/Library/Application%20Support/iPhone%20Simulator/5.1/Applications/7733DC6C-CE52-4EB4-9A60-26962F7AEDD9/Prova1.app/Prova1.momd/ 2012-10-22 12: 30: 46.598 Prova1 [2479: fb03] () isEditable 0, entities {Meco = "() name Meco, managedObjectClassName NSManagedObject, renamingIdentifier Meco, isAbstract 0, entity name (null), properties {\ n miracoli = \" (), name miracoli, isOptional 1, isTransient 0, entity Meco, renamingIdentifier miracoli, check predicates (\ n), warnings (\ n), versionHashModifier (null) \ n userInfo {\ n}, attributeType 700, attributeValueClassName NSString, defaultValue (null) \ "; \ n morte = \" (), name morte, isOptional 1, isTransient 0, Meco object, renamingIdentifier morte, check predicates (\ n), warnings (\ n), versionHashModifier (null) \ n userInfo {\ n }, attributeType 700, attributeValueClassName NSString, defaultValue (null) \ "; \ n nome = \" (), name nome, isOptional 1, isTransient 0, Meco object, renamingIdentifier nome, check predicates (\ n), warnings (\ n), versionHashModifier (null) \ n userInfo {\ n}, attributeType 700, attributeValueClassName NSString, defaultValue (null) \ "; \ n relationship = \" (), name relationship, isOptional 1, isTrans ient 0, Meco entity, renamingIdentifier relationships, validation predicates (\ n) , warnings (\ n), versionHashModifier (null) \ n userInfo {\ n}, target entity Stica, relation inverseRelationship, minCount 1, maxCount 1, isOrdered 0, deleteRule 1 \ "; \ n}, entities (null), userInfo {\ n}, versionHashModifier (null) "; Stica = "() name Stica, managedObjectClassName NSManagedObject, renamingIdentifier Stica, isAbstract 0, entity name (null), properties {\ n nome = \" (), name nome, isOptional 1, isTransient 0, entity Stica, renamingIdentifier nome, validation predicates (\ n), warnings (\ n), versionHashModifier (null) \ n userInfo {\ n}, attributeType 700, attributeValueClassName NSString, defaultValue (null) \ "; \ n relationship = \" (), name relationship, isOptional 1, isTransient 0, Stica object, renamingIdentifier relationships, validation predicates (\ n), warnings (\ n), versionHashModifier (null) \ n userInfo {\ n}, Meco target, inverseRelationship relationship, minCount 1, maxCount 1, isOrdered 0, deleteRule 1 \ "; \ n sfiga = \" (), name sfiga, isOptional 1, isTransient 0, Stica object, renamingIdentifier sfiga, check predicates (\ n), warnings (\ n), versionHashModifier (null) \ n userInfo {\ n}, attributeType 700, attributeValueClassName NSString, defaultValue (null) \ "; \ n}, subentiti es (null), userInfo {\ n}, versionHashModifier (null) "; }, fetch request patterns {}

and I don’t know why storeURL has this form, what is “file: // localhost /” at the end of the line? Why can't create a .sqlite file? and which is the right way to solve the problem? I already tried resetting the simulator and the paths are correct ...

Thank you in advance

edit1: tut i learned, this

edit2: A possible solution that works is to change this piece of code:

 NSString *storePath = [[[self applicationDocumentsDirectory] absoluteString] stringByAppendingPathComponent:@"Prova1.sqlite"]; NSURL *storeURL = [NSURL fileURLWithPath:storePath]; // Put down default db if it doesn't already exist NSFileManager *fileManager = [NSFileManager defaultManager]; if (![fileManager fileExistsAtPath:storePath]) { NSString *defaultStorePath = [[NSBundle mainBundle] pathForResource:@"Prova1" ofType:@"sqlite"]; if (defaultStorePath) { [fileManager copyItemAtPath:defaultStorePath toPath:storePath error:NULL]; } }/**/

with:

 NSURL *storeURL = [[self applicationDocumentsDirectory] URLByAppendingPathComponent:@"Prova1.sqlite"]; // Put down default db if it doesn't already exist NSFileManager *fileManager = [NSFileManager defaultManager]; if (![fileManager fileExistsAtPath:storePath]) { NSURL *defaultStoreURL = [[NSBundle mainBundle] URLForResource:@"Prova1" withExtension:@"sqlite"]; if (defaultStoreURL) { [fileManager copyItemAtURL:defaultStoreURL toURL:storeURL error:NULL]; } }/**/
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1 answer

Using absoluteString in

 NSString *storePath = [[[self applicationDocumentsDirectory] absoluteString] stringByAppendingPathComponent:@"Prova1.sqlite"];

wrong. It creates a string

 file:/localhost/Users/winimac01/...

where "file:" is actually part of the line, so this file, of course, does not exist.

Using path instead should fix the problem:

 NSString *storePath = [[[self applicationDocumentsDirectory] path] stringByAppendingPathComponent:@"Prova1.sqlite"];
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Source: https://habr.com/ru/post/1441274/

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