Rust

JSON: Nested Objects

See more JSON Examples

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
    }
}

Rust

let json = chilkat::JsonObject::new();

// 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. 
let json_str = "{\"name\": \"donut\",\"image\":{\"fname\": \"donut.jpg\",\"w\": 200,\"h\": 200},\"thumbnail\":{\"fname\": \"donutThumb.jpg\",\"w\": 32,\"h\": 32}}".to_string();

if json.load(&json_str).is_err() {
    println!("{}", json.last_error_text());
    return;
}

// Get the "image" object.
let image_obj = chilkat::JsonObject::new();
let _ = json.object_of2("image", &image_obj);

println!("image: fname={}, width={}, height={}", image_obj.string_of("fname").unwrap_or_default(), image_obj.int_of("w"), image_obj.int_of("h"));

// Get the "thumbnail" object.
let thumb_obj = chilkat::JsonObject::new();
let _ = json.object_of2("thumbnail", &thumb_obj);

println!("thumbnail: fname={}, width={}, height={}", thumb_obj.string_of("fname").unwrap_or_default(), thumb_obj.int_of("w"), thumb_obj.int_of("h"));