9. Writing Native Extensions for the Standalone Dart VM | DART Essentials

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DART Essentials

By : Sikora

4.8 (4)

DART Essentials

4.8 (4)

By: Sikora

Overview of this book

This book is targeted at expert programmers in JavaScript who want to learn Dart quickly. Some previous experience with OOP programming in other languages and a good knowledge of JavaScript are assumed.

Preface

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Free Chapter

1. Getting Started with Dart

1. Getting Started with Dart

What is Dart?

Why choose Dart?

Installing the Dart SDK

The Dart language tour

Summary

2. Practical Dart

2. Practical Dart

Optimizing DOM tree manipulations

The documentation search app

Combining Dart and JavaScript

Dart MythBusters

Summary

3. The Power of HTML5 with Dart

3. The Power of HTML5 with Dart

Creating the Reddit Read Later app

Music visualizer

Other noteworthy APIs and libraries

Summary

4. Developing a Mobile App with Dart

4. Developing a Mobile App with Dart

300 ms tap delay

Basics of CSS3 transformations

A 3D bookshelf with DeviceOrientation events

Position and distance tracker with the GeoLocation API and Google Maps API

Drawing into 2D canvas using onTouch events

Summary

5. Web Components and polymer.dart

5. Web Components and polymer.dart

Web Components

The Web Components polyfill for older browsers

Basic HTML Import

Using Shadow DOM

Using Custom Elements

Polymer.dart

One-way data binding

Two-way data binding

Polymer core and paper elements

Summary

6. AngularDart

6. AngularDart

Installing AngularDart

To-do list with AngularDart

Extending the to-do list

A book component in AngularDart

What is Angular 2.0?

Performance tips for AngularDart

Summary

7. Server-side Applications with Dart

7. Server-side Applications with Dart

The standalone Dart VM

Parsing CLI arguments with the args package

Writing a chat app with the WebSockets server

Writing an HTTP server with the route package

Using Dart as a full-stack language

Summary

8. Testing and Profiling the Dart Code

8. Testing and Profiling the Dart Code

Testing strategies for web apps

Unit testing

Operator overloading and mixins

Testing AngularDart apps

Profiling with the Observatory tool

Summary

9. Writing Native Extensions for the Standalone Dart VM

9. Writing Native Extensions for the Standalone Dart VM

The structure of native extensions

Writing a minimal native extension

Writing a native fuzzy search implementation

Writing bindings for the exiv2 library

Distributing native extensions

Summary

Index

Index

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Writing bindings for the exiv2 library

There are thousands of libraries already written in C/C++ and used in practice, sometimes for decades. Therefore, it doesn't make sense to try to write everything from scratch. Of course, if you want to run your code in the browser, you have to rewrite it into Dart, but in cases where you're only interested in server-side scripting, you can reuse existing C/C++ code, wrap it with a small native extension, and use it in Dart.

In this example, we'll use exiv2, which is a library written in C++ that can read and modify the EXIF metadata from pictures. This is, for example, what camera vendor and model you used, the exposure time, and so on:

// main.cpp
// Header file is a part of exiv2 source code.
#include "exiv2.hpp"

void GetExifRecord(Dart_NativeArguments arguments) {
    Dart_EnterScope();
    
    const char *filename;
    const char *tag;
    Dart_StringToCString(
        Dart_GetNativeArgument(arguments, 0), &filename);
    Dart_StringToCString...

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