(Objective-C) JSON: Nested Objects

Here we have a JSON object that contains nested JSON objects. This example demonstrates how to access the contents of the nested objects.

{
  "name": "donut",
  "image":
    {
    "fname": "donut.jpg",
    "w": 200,
    "h": 200
    },
  "thumbnail":
    {
    "fname": "donutThumb.jpg",
    "w": 32,
    "h": 32
    }
}

Chilkat Objective-C Library Downloads MAC OS X (Cocoa) Libs iOS Libs

#import <CkoJsonObject.h>
#import <NSString.h>

CkoJsonObject *json = [[CkoJsonObject alloc] init];

// This is the above JSON with whitespace chars removed (SPACE, TAB, CR, and LF chars).
// The presence of whitespace chars for pretty-printing makes no difference to the Load
// method. 
NSString *jsonStr = @"{\"name\": \"donut\",\"image\":{\"fname\": \"donut.jpg\",\"w\": 200,\"h\": 200},\"thumbnail\":{\"fname\": \"donutThumb.jpg\",\"w\": 32,\"h\": 32}}";

BOOL success = [json Load: jsonStr];
if (success != YES) {
    NSLog(@"%@",json.LastErrorText);
    return;
}

// Get the "image" object.
CkoJsonObject *imageObj = [json ObjectOf: @"image"];
if (json.LastMethodSuccess == NO) {
    NSLog(@"%@",@"image object not found.");
    return;
}

NSLog(@"%@%@%@%d%@%d",@"image: fname=",[imageObj StringOf: @"fname"],@", width=",[[imageObj IntOf: @"w"] intValue]
    ,@", height=",[[imageObj IntOf: @"h"] intValue]);

// Get the "thumbnail" object.
CkoJsonObject *thumbObj = [json ObjectOf: @"thumbnail"];
if (json.LastMethodSuccess == NO) {
    NSLog(@"%@",@"thumbnail object not found.");
    return;
}

NSLog(@"%@%@%@%d%@%d",@"thumbnail: fname=",[thumbObj StringOf: @"fname"],@", width=",[[thumbObj IntOf: @"w"] intValue]
    ,@", height=",[[thumbObj IntOf: @"h"] intValue]);