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Cross-platform Desktop Application Development: Electron, Node, NW.js, and React

You're reading from   Cross-platform Desktop Application Development: Electron, Node, NW.js, and React Build desktop applications with web technologies

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Product type Paperback
Published in Jul 2017
Publisher Packt
ISBN-13 9781788295697
Length 300 pages
Edition 1st Edition
Languages
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Author (1):
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Dmitry Sheiko Dmitry Sheiko
Author Profile Icon Dmitry Sheiko
Dmitry Sheiko
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Toc

Table of Contents (9) Chapters Close

Preface 1. Creating a File Explorer with NW.js-Planning, Designing, and Development FREE CHAPTER 2. Creating a File Explorer with NW.js – Enhancement and Delivery 3. Creating a Chat System with Electron and React – Planning, Designing, and Development 4. Creating a Chat System with Electron and React – Enhancement, Testing, and Delivery 5. Creating a Screen Capturer with NW.js, React, and Redux – Planning, Design, and Development 6. Creating a Screen Capturer with NW.js: Enhancement, Tooling, and Testing 7. Creating RSS Aggregator with Electron, TypeScript , React, and Redux: Planning, Design, and Development 8. Creating RSS Aggregator with Electron, TypeScript, React, and Redux: Development

Taking a screenshot

The previously created static prototype may look fancy, but is not of much use. We need a service capable of taking screenshots and recording screencasts.

If it was about a screenshot of the application window, we would simply use the API on NW.js:

import * as fs from "fs"; 
function takeScreenshot( filePath ){
appWindow.capturePage(( img ) => {
fs.writeFileSync( filePath, img, "base64" );
}, {
format : "png",
datatype : "raw"
});
}

But we need a screenshot of the screen and, therefore, we have to get access to display input. W3C includes a specification draft, "Media Capture and Streams" (http://bit.ly/2qTtLXX), which describes an API to capture displayed media (mediaDevices.getDisplayMedia). Unfortunately, at the time of writing, it's not yet supported in NW.js or, to be honest,...

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