getting the value from an NSDictionary of NSDictionaries - json

Question

I am doing a native objC app. ios5
I want to parse a JSON file in the local bundle.
And read each item individually.
To follow is a sample of my JSON file, followed by the code I have working.
I also have explanation of what I think is going on, and the sample code that I need to get assistance with. You are welcome to correct my interpretation as well.
=========================================================================
{"a":[
{"b":{"Q01":"A01","Q02":"B01","Q03":"C01","Q04":"D01","Q05":"E01","Q06":"X","C1":"NR","CABG":"NR","PCI":"NR"}},
{"b":{"Q01":"A01","Q02":"B01","Q03":"C01","Q04":"D01","Q05":"E02","Q06":"X","C1":"I","C1IND":"20","C1SCORE":"3","CABG":"NR","PCI":"NR"}},
{"b":{"Q01":"A01","Q02":"B01","Q03":"C01","Q04":"D01","Q05":"E03","Q06":"X","C1":"NR","CABG":"NR","PCI":"NR"}},
{"b":{"Q01":"A01","Q02":"B01","Q03":"C01","Q04":"D01","Q05":"E04","Q06":"X","C1":"NR","CABG":"NR","PCI":"NR"}},
{"b":{"Q01":"A01","Q02":"B01","Q03":"C01","Q04":"D01","Q05":"E05","Q06":"X","C1":"NR","CABG":"NR","PCI":"NR"}}
]}
My code looks like:
NSString* filePath = [[NSBundle mainBundle] pathForResource:#"nonacs" ofType:#"json"];
NSError* error = nil;
NSData *jsonData = [NSData dataWithContentsOfFile:filePath options:NSDataReadingMappedIfSafe error:&error];
if (jsonData) {
id jsonObjects = [NSJSONSerialization JSONObjectWithData:jsonData options:NSJSONReadingMutableContainers error:&error];
if (error) {
NSLog(#"error is %#", [error localizedDescription]);
// Handle Error and return
return;
}
//NSArray *keys = [jsonObjects allKeys];
// not necessary becuase I know the Root key is a single "a"
NSString* jsonString = [NSString stringWithFormat:#"%#",[jsonObjects objectForKey:#"a"]];
tLabel01.text = [NSString stringWithFormat:#"jsonData Length is = %d", [jsonData length]];
NSDictionary* dict01 = [[NSDictionary alloc] initWithDictionary:jsonObjects];
l2.text = [NSString stringWithFormat:#"dict01 length = %d", dict01.count];
NSDictionary* dict02 =[[NSDictionary alloc] initWithDictionary:dict01];
l3.text = [NSString stringWithFormat:#"dict2.length = %d", dict02.count];
//NSArray* array01 = [[NSArray alloc] initWithObjects:dict01, nil];
//NSArray *allvalues = [jsonObjects allValues];
//NSArray *allvalues = [[jsonObjects initWithContentsOf ] allValues];
//l3.text = [NSString stringWithFormat:#"allvalues.count = %d", allvalues.count];
//NSDictionary *dictB = [dict01 objectForKey:#"b"];
//l3.text = [NSString stringWithFormat:#"dictB.count = %d", dictB.count];
l3.text = [NSString stringWithFormat:#"jsonObject count = %d", [[jsonObjects objectForKey:#"a"] count]];
// this works really well... except it returned 1700, and there should only be 1550
//l4.text = #"nada";
//[[jsonObjects objectForKey:#"a"] count]]
NSArray *array = [jsonObjects objectForKey:#"a"];
NSArray *arrayVariable = [array objectAtIndex:0];
//l4.text = [NSString stringWithFormat:#"Q01 = %#", [arrayVariable objectForKey: #"Q01"]];
//l4.text =[NSString stringWithFormat:#"arrayVariable count = %d", arrayVariable.count];
NSArray *arrayb = [jsonObjects objectForKey:#"b"];
l4.text = [NSString stringWithFormat:#"arrayb count = %d", arrayb.count];
bTV01.text = jsonString;
};
=============================================================================
The root Object is an NSDictionary with single Key "a".
The value corresponding to that value is an NSArray.
The array contains NSDictionaries with a single Key "b".
The B NSDictionaries contain another NSDictionary.
could someone show me the code to display the 3rd B NSDictionary value for "Q02" please
thanks

Answer 1

[[[root objectForKey:#"a"] valueForKey:#"b"] objectAtIndex:2]