How to parse my JSON data in IOS5

Question

Can anyone tell me how to parse my json data in IOS5. I'm providing my JSON data below:

{
 "fieldType" : "Alphanumeric",
 "fieldName" : "Name"
},{
 "fieldType" : "Numeric",
 "fieldName" : "Card Num"
},{
 "fieldType" : "Alphanumeric",
 "fieldName" : "Pin Num"
}

Also is this JSON format correct or do I need to change the JSON format? When I try to parse JSON using below code I get an error:

The operation couldn’t be completed. (Cocoa error 3840.)

The code I'm using:

NSError *error = nil;
NSData *jsonData = [filedList dataUsingEncoding:[NSString defaultCStringEncoding]];
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];

    // values in foreach loop
    for (NSString *key in keys)
    {
        NSLog(@"%@ is %@",key, [jsonObjects objectForKey:key]);
    }                
} 
else 
{
    // Handle Error 
}

use jsonlint.com to validate your JSON. It's invalid

Matthias Bauch
– Matthias Bauch

2012-09-23 10:11:16 +00:00
Commented Sep 23, 2012 at 10:11 — Matthias Bauch
– Matthias Bauch, Commented Sep 23, 2012 at 10:11

Martin R · Accepted Answer · 2012-09-23 10:02:46Z

3

The JSON data is not correctly formatted. Since you have an array of items, you need to enclose this in [ ... ]:

[
    {
     "fieldType" : "Alphanumeric",
     "fieldName" : "Name"
    },{
     "fieldType" : "Numeric",
     "fieldName" : "Card Num"
    },{
     "fieldType" : "Alphanumeric",
     "fieldName" : "Pin Num"
    }
]

Now JSONObjectWithData gives you an NSMutableArray of NSMutableDictionary objects (because of the NSJSONReadingMutableContainers flag).

You can walk through the parsed data with

for (NSMutableDictionary *dict in jsonObjects) {
    for (NSString *key in dict) {
        NSLog(@"%@ is %@",key, [dict objectForKey:key]);
    }
}

answered Sep 23, 2012 at 10:02

Martin R

541k98 gold badges1.3k silver badges1.4k bronze badges

Sign up to request clarification or add additional context in comments.

Comments

vishy · Accepted Answer · 2012-09-23 10:07:27Z

In any type of parsing, first of all NSLog the JSON or XML string then start writing your parsing your code.

In your case as per the JSON string you mentioned its a array of dictionaries, and once you got your jsonObjects do this to get your data..

 id jsonObjects = [NSJSONSerialization JSONObjectWithData:jsonData options:NSJSONReadingMutableContainers error:&error];
NSLog(@"%@",jsonObjects);
// as per your example its an array of dictionaries so

NSArray* array = (NSArray*) jsonObjects;
for(NSDictionary* dict in array)
{
NSString* obj1 = [dict objectForKey:@"fieldType"];
NSString* obj2 = [dict objectForKey:@"fieldName"];

enter code here
enter code here
}

In this way you can parse the your json string.. for more details go through this tutorial by Raywenderlich.

Collectives™ on Stack Overflow

How to parse my JSON data in IOS5

2 Answers 2

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related