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The JavaScript JSON Cookbook

The JavaScript JSON Cookbook

By : Ray Rischpater
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The JavaScript JSON Cookbook

The JavaScript JSON Cookbook

1 (2)
By: Ray Rischpater

Overview of this book

If you're writing applications that move structured data from one place to another, this book is for you. This is especially true if you've been using XML to do the job because it's entirely possible that you could do much of the same work with less code and less data overhead in JSON. While the book's chapters make some distinction between the client and server sides of an application, it doesn't matter if you're a frontend, backend, or full-stack developer. The principles behind using JSON apply to both the client and the server, and in fact, developers who understand both sides of the equation generally craft the best applications.
Table of Contents (17 chapters)
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JavaScript JSON Cookbook
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
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 using one of the following methods:

  • toArray: This method converts to QJsonArray

  • toBool: This method...

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