Objective C - Parse json array

Question

I want to parse parseItems but I don't know how

json = [
  {
    "devicename" : "WL-00000003",
    "activated" : "true",
    "displayname" : "wit003 ",
    "portitems" : {
      "port1" : "Smoke Sensor",
      "port4" : "",
      "port3" : "",
      "port6" : "Alarm Siren",
      "port2" : "",
      "port5" : ""
    },
    "accountType" : "admin",
    "deviceaddress" : "",
    "devicestatus" : ""
  }
]

It would be easy if portItems would be in this format "portitems" : ({ })

I tried it using this code but it gets error.

NSDictionary *fetchedDictionaryresult = [json objectForKey:@"portItems"];
    for (NSDictionary *event in  fetchedDictionaryresult)
    {
        _strPart1 = [event objectForKey:@"port1"];
        _strPart2 = [event objectForKey:@"port2"];
        _strPart3 = [event objectForKey:@"port3"];
        _strPart4 = [event objectForKey:@"port4"];
        _strPart5 = [event objectForKey:@"port5"];
        _strPart6 = [event objectForKey:@"port6"];
    }

How can I do this?

`portitems` != `portItems`. C / Objective-C is case sensitive. — vadian, Dec 02 '16 at 09:29

Nikhil Manapure · Answer 1 · 2016-12-02T10:03:52.953

1

Try this Here the json is first getting parsed into a dictionary and then we are getting the "portitems" dictionary and then getting strings out of it.

- (void)setPartStringsFrom:(NSData *)json
{
    NSError *localError = nil;
    NSDictionary *parsedObject = [NSJSONSerialization JSONObjectWithData:json options:0 error:&localError];

    if (localError == nil) {
        NSDictionary *event = [parsedObject[0] valueForKey:@"portitems"];

        _strPart1 = [event valueForKey:@"port1"];
        _strPart2 = [event valueForKey:@"port2"];
        _strPart3 = [event valueForKey:@"port3"];
        _strPart4 = [event valueForKey:@"port4"];
        _strPart5 = [event valueForKey:@"port5"];
        _strPart6 = [event valueForKey:@"port6"];

    }
}

and if json is already a dictionary then

 - (void)setPartStringsFrom:(NSDictionary *)json
{
    NSDictionary *event = [json[0] valueForKey:@"portitems"];

    _strPart1 = [event valueForKey:@"port1"];
    _strPart2 = [event valueForKey:@"port2"];
    _strPart3 = [event valueForKey:@"port3"];
    _strPart4 = [event valueForKey:@"port4"];
    _strPart5 = [event valueForKey:@"port5"];
    _strPart6 = [event valueForKey:@"port6"];
}

edited Dec 02 '16 at 10:03

answered Dec 02 '16 at 09:18

Nikhil Manapure

3,748
2
30
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Check [this](http://stackoverflow.com/questions/1062183/difference-between-objectforkey-and-valueforkey) out. – Nikhil Manapure Dec 02 '16 at 09:23
It was probably objectForKey and valueForKey that made the error. – Jongers Dec 02 '16 at 09:33
Don't use `valueForKey` unless you know what KVC is and you really need its functionality. – vadian Dec 02 '16 at 09:34
@vadian could you direct us to some good documentation about KVC and make us understand what it means. This would be helpful. – Nikhil Manapure Dec 02 '16 at 09:35
Short description: [Key-Value Coding](https://developer.apple.com/library/content/documentation/General/Conceptual/DevPedia-CocoaCore/KeyValueCoding.html). The dedicated method to get a value from a dictionary is `objectForKey:` or key subscripting (`event["port1"]`) – vadian Dec 02 '16 at 09:40

CodeChanger · Accepted Answer · 2016-12-02T09:32:08.773

1

for getting portItems you did not need for loop just directly use your dictionary fetchedDictionaryresult like this:

Also I guess you got array not dictionary in Json

Try this:

NSDictionary *fetchedDictionaryresult = [json[0] objectForKey:@"portItems"];

 _strPart1 = [fetchedDictionaryresult objectForKey:@"port1"];
 _strPart2 = [fetchedDictionaryresult objectForKey:@"port2"];
 _strPart3 = [fetchedDictionaryresult objectForKey:@"port3"];
 _strPart4 = [fetchedDictionaryresult objectForKey:@"port4"];
 _strPart5 = [fetchedDictionaryresult objectForKey:@"port5"];
 _strPart6 = [fetchedDictionaryresult objectForKey:@"port6"];

edited Dec 02 '16 at 09:32

answered Dec 02 '16 at 09:19

CodeChanger

7,953
5
49
80

But it get's this error `-[__NSSingleObjectArrayI objectForKey:]: unrecognized selector sent to instance` – Jongers Dec 02 '16 at 09:26
Check my updated answer i guess you are getting Array in `json` not NSDictionary. – CodeChanger Dec 02 '16 at 09:32
Nope, because it becomes (null) after i made json[0] but it did return NSString. I have to make adjustments. – Jongers Dec 02 '16 at 09:45
means you didn't get `_strPart1` value ? – CodeChanger Dec 02 '16 at 09:48
It gets error when I try to directly get row [0] from `[json[0] objectForKey:@"portItems"];` because json is NSDictionary that's why I made this base on your answer with row [0] `id event = [json valueForKey:@"portitems"];` `_strPart1 = [event[0] valueForKey:@"port1"];` – Jongers Dec 02 '16 at 09:56
Thanks & appreciate your efforts. – CodeChanger Dec 02 '16 at 09:59

score 1 · Answer 3 · answered Dec 02 '16 at 09:28

1

NSDictionary *dict= [responce valueforkey:@"portitems"];
NSMutableArray *portitems1=[dict valueForKey:@"port1"];
 NSMutableArray *portitems2=[dict valueForKey:@"port2"];
NSMutableArray *portitems3=[dict valueForKey:@"port3"];
NSMutableArray *portitems4=[dict valueForKey:@"port4"];
NSMutableArray *portitems5=[dict valueForKey:@"port5"];

answered Dec 02 '16 at 09:28

Siva Sankar

543
1
4
18

Here response means means result dictionary object. – Siva Sankar Dec 02 '16 at 09:28

Objective C - Parse json array

3 Answers3