How to extract data from NSMutableArray

Question

Want to extract value from the NSMutableArray

After services call I got response which is stored in NSMutableArray

`arrayList` = responseData

The response data is an JSON string

Below is response data structure:

 {
        firstSet =     (
        );
        secondSet =     {
            id = 12;
            name = rohan;
        };
        "status_code" = 200;
        success = 1;
    }

I want to extract name field and id from the arrayList. This is what I tried, not working me.

[[[arrayList objectAtIndex:0] objectForKey:@"secondSet"] objectForKey:@"name"]];

Error Message -[__NSDictionaryM objectAtIndex:]: unrecognized selector sent to instance 0x7c6763e0

possible duplicate of [How can I debug 'unrecognized selector sent to instance' error](http://stackoverflow.com/questions/25853947/how-can-i-debug-unrecognized-selector-sent-to-instance-error) — Hot Licks, Apr 10 '15 at 17:53
to solve it I need to declear NsMutableArray to NSmutablDictionary... from there i can extract the values!? — kiran, Apr 10 '15 at 17:59
To solve you need to not assign an NSDictionary address to an NSArray pointer. — Hot Licks, Apr 10 '15 at 18:02
@HotLicks I agree what you say, And also i got the data structure. — kiran, Apr 10 '15 at 18:27

score 1 · Answer 1 · answered Apr 10 '15 at 17:51

1

The variable you're referring to as "arraylist" is actually a Dictionary. Try asking it for "secondset"

[[arrayList objectForKey:@"secondSet"] objectForKey:@"name"];

answered Apr 10 '15 at 17:51

KirkSpaziani

1,962
12
14

the variable which i defined is a NSMutableArray Not NSMutableDictionary, – kiran Apr 10 '15 at 17:57
Doesn't matter what it's defined as - somehow (through the JSON deserializer maybe?) the reference is pointing to a dictionary. The error indicates as such. Since all Objective-C references are just pointers, and not checked, it's easy at runtime to have something pointing to the wrong object type. – KirkSpaziani Apr 10 '15 at 18:02
@kiran - The running code doesn't care how you defined the pointer -- that's only meaningful to the compiler, and then only if it's right. The object type is defined by the JSON data. – Hot Licks Apr 10 '15 at 18:04

score -3 · Answer 2 · answered Apr 10 '15 at 17:52

-3

you would be getting json which you may handle like this

NSDictionary *dic;
if (data!=nil)
    {
        dic = [NSJSONSerialization
               JSONObjectWithData:data //1
               options:NSJSONReadingMutableContainers
               error:&error];
    }
NSString *name = [[dic objectForKey:@"second"] objectForKey:@"name"];

answered Apr 10 '15 at 17:52

Syed Ali Salman

2,894
4
33
48

1

He already has it parsed. And you fail to demonstrate proper error checking anyway. – Hot Licks Apr 10 '15 at 17:55

How to extract data from NSMutableArray

2 Answers2