CFURLSetResourcePropertyForKey failed when disable data backup on NSDocumentDirectory

Question

I am trying to download image files and store in NSDocumentDirectory. In order to do so, I has to turn off data backup on iCloud and iTunes. Below are my codes:

+(void)saveData:(NSData*)thedata:(NSString*)fileName {    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);    NSString *documentsDirectory = [paths objectAtIndex:0];    NSString *localFilePath = [documentsDirectory stringByAppendingPathComponent:fileName];    NSFileManager *fileManager = [NSFileManager defaultManager];    [fileManager createFileAtPath:localFilePath contents:thedata attributes:nil];    //prevent files from backup on iCloud or iTune    NSURL *fileURL = [NSURL URLWithString:localFilePath];    [self addSkipBackupAttributeToItemAtURL:fileURL]; } 

and for my addskipbackupattributetoitematurl:

+(BOOL)addSkipBackupAttributeToItemAtURL:(NSURL *)fileURL {    if (![[NSFileManager defaultManager] fileExistsAtPath:[fileURL path]])    {        NSLog(@"File %@ doesn't exist!",[fileURL path]);        return NO;    }    NSString *currSysVer = [[UIDevice currentDevice] systemVersion];        if ([currSysVer isEqualToString:@"5.0.1"])    {        const char* filePath = [[fileURL path] fileSystemRepresentation];        const char* attrName = "com.apple.MobileBackup";        u_int8_t attrValue = 1;        int result = setxattr(filePath, attrName, &attrValue, sizeof(attrValue), 0, 0);        NSLog(@"Excluded '%@' from backup",fileURL);        return result == 0;    }    else if (&NSURLIsExcludedFromBackupKey)    {        NSError *error = nil;        BOOL result = [fileURL setResourceValue:[NSNumber numberWithBool:YES] forKey:NSURLIsExcludedFromBackupKey error:&error];        if (result == NO)        {            NSLog(@"Error excluding '%@' from backup. Error: %@",fileURL, error);            return NO;        }        else        {             NSLog(@"Excluded '%@' from backup",fileURL);            return YES;        }    }    else    {        return YES;    } } 

However, the BOOL result = [fileURL setResourceValue:[NSNumber numberWithBool:YES] forKey:NSURLIsExcludedFromBackupKey error:&error]; created the following message

CFURLSetResourcePropertyForKey failed because it was passed this URL which has no scheme: /var/mobile/Applications/CF69D567-1D37-4053-BFA8-5D0FCBD9C2B2/Documents/coffee.jpg

I'm just wondering if any encountered this problem??

Answer 1

Solved. once I changed

NSURL *fileURL = [NSURL URLWithString:localFilePath]; 

to

NSURL *fileURL = [NSURL fileURLWithPath:localFilePath]; 

everything work perfectly.