Issues getting json from webserver in iOS5

Question

I have a app that receive a feed from a server through json.

I have been building it for iOS5, but in the last weeks testing with iOS6. I tested today with a iOS5 device, and everything crashed.

The code looks like this:

NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:@"http://www.myserver.com/news.json"]];
NSDictionary *json = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];

It worked without problems, but now it returns a null. The data is not null.

The URL open, and is not empty. iOS6 devices receive without problems the feed. — lagos, Oct 04 '12 at 12:54
Its looks like the problem reside in the conversion of `NSData` to `NSDictionary`with `NSJSONSerialization`. If I convert the `NSData` to `NSString` I got the JSON. — lagos, Oct 05 '12 at 08:53
The error I getting from NSJSONSerialization is `Cocoa error 3840` — lagos, Oct 05 '12 at 11:17
To print the error: NSError *error = nil; NSData *data = [NSData dataWithContentsOfURL:url options:kNilOptions error:&error]; NSLog(@"%@",[error localizedDescription]); — alexandresoli, Oct 05 '12 at 12:06

score 1 · Answer 1 · edited Jul 29 '14 at 17:48

1

Cocoa error 3840 means

The data couldn’t be read because it has been corrupted. (No string key for value in object around character 2.)

You should check your json with a validator like http://www.jsoneditoronline.org/ or http://jsonformatter.curiousconcept.com/

edited Jul 29 '14 at 17:48

Alex Stone

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answered Oct 05 '12 at 12:10

alexandresoli

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I checked it, and is valid. But look at my own answer above. – lagos Oct 05 '12 at 12:29

lagos · Accepted Answer · 2012-10-05T12:29:46.753

0

The issue was a duplicated key from the webserver. Now it works.

But it strange that the error is trigged in iOS5 and not in iOS6.

edited Oct 05 '12 at 12:29

answered Oct 05 '12 at 12:00

lagos

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Issues getting json from webserver in iOS5

2 Answers2