NSURLIsExcludedFromBackupKey can not be set correctly

Question

I am trying to prevent a whole folder from beeing backed up by itunes. I followed the Technical Report http://developer.apple.com/library/ios/#qa/qa1719/_index.html But it seems that falg is everytime nil. I use IOS 5.1 tried in in simulator and on device. But nothing helps. The methods return "success" every time, but flag is still nil. ``` + (BOOL) hasSkipBackupAttributeToItemAtURL:(NSURL *)URL { NSError *error = nil; id flag = nil; BOOL success = [URL getResourceValue: &flag forKey: NSURLIsExcludedFromBackupKey error: &error]; if(!success){ NSLog(@"Error excluding %@ from backup %@", [URL lastPathComponent], error); return false; } if (!flag) return false; return [flag boolValue]; } + (BOOL)addSkipBackupAttributeToItemAtURL:(NSURL *)URL { NSError *error = nil; BOOL success = [URL setResourceValue: [NSNumber numberWithBool: YES] forKey: NSURLIsExcludedFromBackupKey error: &error]; if(!success){ NSLog(@"Error excluding %@ from backup %@", [URL lastPathComponent], error); } return suc…

Accepted Answer

I just fixed this in my app and while it was kind of frustrating , it all ended up working great. So , here's the code for the addSkipBackupAttributeToItemAtURL . You may want to check that out. It treats 5.0.1 and 5.0 too. You are only treating 5.1 and higher in your code.

BUT:

Let's say you have an NSString *path - the path to your file /folder , don't call the method with:

`[NSURL urlWithString:path];` It will work on 5.0.1 but not on 5.1 and higher.

Instead `use [NSURL fileURLWithPath:path];`

So: [MyClass addSkipBackupAttributeToItemAtURL:[NSURL fileURLWithPath:path]];

In fact , I think that is the only problem with your code. Taking the method I linked to , will only provide backward compatibility , which is a great addition.

Hope this helps.

Regards, George

NSURLIsExcludedFromBackupKey can not be set correctly

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