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The JavaScript JSON Cookbook

You're reading from   The JavaScript JSON Cookbook Over 80 recipes to make the most of JSON in your desktop, server, web, and mobile applications

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Product type Paperback
Published in Jun 2015
Publisher
ISBN-13 9781785286902
Length 192 pages
Edition 1st Edition
Languages
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Toc

Table of Contents (12) Chapters Close

Preface 1. Reading and Writing JSON on the Client FREE CHAPTER 2. Reading and Writing JSON on the Server 3. Using JSON in Simple AJAX Applications 4. Using JSON in AJAX Applications with jQuery and AngularJS 5. Using JSON with MongoDB 6. Using JSON with CouchDB 7. Using JSON in a Type-safe Manner 8. Using JSON for Binary Data Transfer 9. Querying JSON with JSONPath and LINQ 10. JSON on Mobile Platforms Index

Parsing JSON using Qt

The Qt implementation of JSON parsing is actually quite similar in its interface to the Android version. Qt defines the QJsonObject and QJsonArray classes, which can contain JSON maps and JSON arrays respectively. The parsing itself is done by the QJsonDocument class, which has a static fromJson method that accepts JSON and performs the necessary parsing.

How to do it…

Here's a simple example:

QString json = "{ 'call': 'kf6gpe-7', 'lat': 37.40150, 'lng': -122.03683, 'result': 'ok'}";
QJsonDocument document = QJsonDocument.fromJson(json);
QJsonObject data = document.object;
QString call = data["call"].toString();

How it works…

The parsing is two-step: first, the code parses the JSON using QJsonDocument and then uses the resulting QJsonObject to access the data.

The QJsonObject class works as a map of QJsonValue objects, each of which can be converted to their fundamental types...

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