objective-c extract single value from json string

Question

I have the following json returned string:

[{"status":2,"id":"-1","content":"User has entered wrong input","time":1346765646202}]

(as you can see the result is in an array that contains a single object).

How can I extract the value of status and content without Enumeration?

For now I created a dictionary and run on it with enumeration, but I don't like the solution:

NSData *jsonData = [returnString dataUsingEncoding:NSUTF8StringEncoding];
NSDictionary *json = [NSJSONSerialization JSONObjectWithData:jsonData options:0 error:&error];

Chris Trahey · Accepted Answer · 2012-09-04 13:55:06Z

4

Because the whole thing is wrapped in [], it will deserialize into an NSArray (of size 1) (not an NSDictionary as your code implies). The element in that array will be an NSDictionary ({}). You can get that dictionary with objectAtIndex:0 and skip your enumeration:

NSData *jsonData = [returnString dataUsingEncoding:NSUTF8StringEncoding];
NSArray *json = [NSJSONSerialization JSONObjectWithData:jsonData options:0 error:&error];
NSDictionary *response = [json objectAtIndex:0];
NSNumber *status = [response objectForKey:@"status"];
NSString *content = [response objectForKey:@"content"];

answered Sep 4, 2012 at 13:55

Chris Trahey

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Comments

Ashley Mills · Accepted Answer · 2012-09-04 13:52:46Z

0

NSNumber * status = json[@"status"]

or

NSNumber * status = [json objectForKey: @"status"]

etc.

answered Sep 4, 2012 at 13:52

Ashley Mills

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1 Comment

Dejell Over a year ago

NSNumber *status = [json objectForKey: @"status"]; throws an exception: 'NSInvalidArgumentException', reason: '-[__NSCFArray objectForKey:]: please note that it's an array of json strings

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