IOS Dev Fetching JSON Data - ios

Question

I am a novice at IOS dev and i really need some help.
I want to parse (which is working) and fetch some JSON Data.
i used this tutorial for the http request and json parsing
http://www.mysamplecode.com/2013/04/ios-http-request-and-json-parsing.html
everything works fine with a 1 dimensional dictionary
but I need to be able to fetch the following JSON Data
[{"defaultGateway": "10.10.10.254", "hostname": "On", "connected": "true", "subnetMask": "255.255.255.255", "iPAddress": "10.10.10.10", "dhcpEnabled": "true"},
{"defaultGateway": "10.10.10.254", "hostname": "On", "connected": "true", "subnetMask": "255.255.255.255", "iPAddress": "10.10.10.10", "dhcpEnabled": "true"}]
after I use the following function I got the following dictionary which I really don't know how to access
NSDictionary * res = [NSJSONSerialization
JSONObjectWithData:data
options:NSJSONReadingMutableContainers
error:&error];
here is a picture of the dictionary
http://www11.pic-upload.de/09.11.14/5n4hdg3eh84q.png
How can I access for example the defaultGateway in the first dictionary?

Answer 1

You have a small logical error in your example. The expression [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:&error]; returns an NSArray and not and NSDictionary. So, first you should change this part to:
NSArray *result = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:&error];
I know it's an array because your JSON string contains an array of two JSON objects. NSJSONSerialization will transform JSON arrays into objects of type NSArray and JSON objects into objects of type NSDictionary.
If you're not sure what your JSON contains, you can do the following:
id result = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:&error];
if ([result isKindOfClass:[NSArray class]]){
// do something with the array
}
else if ([result isKindOfClass:[NSDictionary class]]){
// do something with the dictionary
}
As for your question, you can access the data in an NSDictionary by providing a key, which you can do in two ways:
NSString *gateway = [dictionary objectForKey:#"defaultGateway"];
or even faster:
NSString *gateway = dictionary[#"defaultGateway"];
Coming back to your example, to access the defaultGateway from the first of your two JSON objects, you can do the following:
NSArray *result = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:&error]; // parse the JSON and store in array
NSDictionary *dict = result[0]; // take the first of the two JSON objects and store it in a dictionary
NSString *gateway = dictionary[#"defaultGateway"]; // retrieve the defaultGateway property