Rust Requires Chilkat v11.0.0+

JSON: Miscellaneous Operations

See more JSON Examples

Demonstrates a variety of JSON API methods. This example uses the following JSON document:

{
   "alphabet": "abcdefghijklmnopqrstuvwxyz",
   "sampleData" : {
           "pi": 3.14,
	   "apple": "juicy",
	   "hungry": true,
	   "withoutValue": null,
           "answer": 42
          
	}
}

Rust

let json = chilkat::JsonObject::new();
json.set_emit_compact(false);

// Assume the file contains the data as shown above..
if json.load_file("qa_data/json/sample2.json").is_err() {
    println!("{}", json.last_error_text());
    return;
}

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

// Demonstrate BoolAt and BoolOf
println!("hungry: {}", sample_data.bool_of("hungry"));
println!("hungry: {}", sample_data.bool_at(2));

// StringOf returns the value as a string regardless of it's actual type:
println!("pi: {}", sample_data.string_of("pi").unwrap_or_default());
println!("answer: {}", sample_data.string_of("answer").unwrap_or_default());
println!("withoutValue: {}", sample_data.string_of("withoutValue").unwrap_or_default());
println!("hungry: {}", sample_data.string_of("hungry").unwrap_or_default());

// Demonstrate IsNullOf / IsNullAt
println!("withoutValue is null? {}", sample_data.is_null_of("withoutValue"));
println!("withoutValue is null? {}", sample_data.is_null_at(3));
println!("apple is null? {}", sample_data.is_null_of("apple"));
println!("apple is null? {}", sample_data.is_null_at(1));

// IntOf
println!("answer: {}", sample_data.int_of("answer"));

// SetNullAt, SetNullOf
// Set "pi" to null
let _ = sample_data.set_null_at(0).is_ok();
// Set "answer" to null
let _ = sample_data.set_null_of("answer").is_ok();

// Show the changes:
println!("{}", json.emit().unwrap_or_default());

// Restore pi and apple:
let _ = sample_data.set_number_at(0, "3.14").is_ok();
let _ = sample_data.set_number_of("answer", "42").is_ok();

// Show the changes:
println!("{}", json.emit().unwrap_or_default());

// Add a null value named "afterApple" just after "apple"
let _ = sample_data.add_null_at(2, "afterApple").is_ok();

// Add a boolean value just after "pi"
let _ = sample_data.add_bool_at(1, "afterPi", false).is_ok();

// Examine the changes..
println!("{}", json.emit().unwrap_or_default());