NSJSONSerialization: treating special characters properly - objective-c

Question

I want to use online data from a JSON file. It's currently working, but when I use special characters it shows "null". Here's the code I'm using:
NSString *urlString = [NSString stringWithFormat:#"http://belesios.com/burc/koc2.php"];
NSURL *url = [NSURL URLWithString:urlString];
NSData *data = [NSData dataWithContentsOfURL:url];
NSError *error;
NSMutableDictionary *json = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];
NSLog(#"%#", json);
NSString *ciktiText = [[NSString alloc] initWithFormat:#"%#", json];
[kocLabel setText:ciktiText];
For example, if my file contains ç or ü, null is returned. What do I need to do?

Answer 1

Try this method to find out what encoding is used when data is pulled from server:
NSStringEncoding encoding;
NSString *jsonString =[NSString stringWithContentsOfURL:URL usedEncoding:&encoding error:&error];
if (error)
NSLog(#"Error: %#", error);
You should check encoding of data returned by the server. Your code is correct but you should add some check if error != nil then don't execute and display or log that.
NSString *jsonString = #"{\"abc\":\"ç or ü\"}";
NSDictionary *jsonObj = [NSJSONSerialization JSONObjectWithData:[jsonString dataUsingEncoding:NSUTF8StringEncoding] options:NSJSONReadingAllowFragments error:&error];
NSLog(#"Output: %#", jsonObj);
Output: { abc = "\U00e7 or \U00fc"; } This is how your server response should look like with encoded char if you use Fiddler or some other software to print raw response.
Currently your data looks like where as UTF8 encoded chars should be like \U00e7 = ç