Question

I’ve tried to get some data which contains utf-8 characters from iOS, ended up failing : (

1. JSON data come from Rails app.

   render :json => @users

   snippet shows below:
   {"likes_num":554,"name":"\u62c9\u7f8e\u4eb2\u5386\u8bb0\u00a0","remote_id":63573783,"remote_identifier":"douban"}

2. Used both NSJSONSerialization and SBJson with failures. And it seems utf-8 string are modified as name = "\U62c9\U7f8e\U4eb2\U5386\U8bb0\U00a0";(Using NSLog(@"%@", json)).

3. NSLog(@"%@", [json objectForKey:@"name"]) just return nothing, leave no log.
4. Save the name as NSString *name, and NSLog remains the same, but print description of name when debug, the utf-8 sentence appears perfectly.
5. Tried [name description], got nothing either.

Please give me some hints to figure out what really happens to my utf-8 sentence.
Thanks in advanced.

UPDATE: Value for other keys works fine, i.e [json objectForKey:@"remote_identifier"] gives douban, only @"name" down for no reason.

Dave

Answer 1

With the help from a colleague of mine, i got over this finally. Here is how:

Actually, there are something i haven’t mentioned in the question that the value of name can sometimes be null or nil. And with this type of value, the type of this field is set to something related to KFNull, and every access of the data risk in sending a isEqualToString: to NSNull which doesn’t response to that method.

And i still don’t understand why NSLog failed to print out the non-null data. But i’ve got a solution to the problem.

 NSString *name = [json objectForKey:@"name"];
 if ((CFNull)name == kCFNull)
   name = nil;
 myLabel.text = name;

Surprisingly it have no relation with encoding : /