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Home > Cloud & Networking > Networking > Boost.Asio C++ Network Programming Cookbook
Boost.Asio C++ Network Programming Cookbook
Boost.Asio C++ Network Programming Cookbook

Boost.Asio C++ Network Programming Cookbook: Over 25 hands-on recipes to create robust and highly-efficient cross-platform distributed applications with the Boost.Asio library

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Boost.Asio C++ Network Programming Cookbook

Chapter 2. I/O Operations

In this chapter, we will cover the following recipes:

  • Using fixed length I/O buffers
  • Using extensible stream-oriented I/O buffers
  • Writing to a TCP socket synchronously
  • Reading from a TCP socket synchronously
  • Writing to a TCP socket asynchronously
  • Reading from a TCP socket asynchronously
  • Canceling asynchronous operations
  • Shutting down and closing a socket

Introduction

I/O operations are the key operations in the networking infrastructure of any distributed application. They are directly involved in the process of data exchange. Input operations are used to receive data from remote applications, whereas output operations allow sending data to them.

In this chapter, we will see several recipes that show how to perform I/O operations and other operations related to them. In addition to this, we'll see how to use some classes provided by Boost.Asio, which are used in conjunction with I/O operations.

The following is the short summary and introduction to the topics discussed in this chapter.

I/O buffers

Network programming is all about organizing inter-process communication over a computer network. Communication in this context implies exchanging data between two or more processes. From the perspective of a process that participates in such communication, the process performs I/O operations, sending data to and receiving it from other participating...

Using fixed length I/O buffers

Fixed length I/O buffers are usually used with I/O operations and play the role of either a data source or destination when the size of the message to be sent or received is known. For example, this can be a constant array of chars allocated on a stack, which contain a string that represents the request to be sent to the server. Or, this can be a writable buffer allocated in the free memory, which is used as a data destination point, when reading data from a socket.

In this recipe, we'll see how to represent fixed length buffers so that they can be used with Boost.Asio I/O operations.

How to do it…

In Boost.Asio, a fixed length buffer is represented by one of the two classes: asio::mutable_buffer or asio::const_buffer. Both these classes represent a contiguous block of memory that is specified by the address of the first byte of the block and its size in bytes. As the names of these classes suggest, asio::mutable_buffer represents a writable buffer...

Using extensible stream-oriented I/O buffers

Extensible buffers are those buffers that dynamically increase their size when new data is written to them. They are usually used to read data from sockets when the size of the incoming message is unknown.

Some application layer protocols do not define the exact size of the message. Instead, the boundary of the message is represented by a specific sequence of symbols at the end of the message itself or by a transport protocol service message end of file (EOF) issued by the sender after it finishes sending the message.

For example, according to the HTTP protocol, the header section of the request and response messages don't have a fixed length and its boundary is represented by a sequence of four ASCII symbols, <CR><LF><CR><LF>, which is part of the message. In such cases, dynamically extensible buffers and functions that can work with them, which are provided by the Boost.Asio library, are very useful.

In this recipe...

Writing to a TCP socket synchronously

Writing to a TCP socket is an output operation that is used to send data to the remote application connected to this socket. Synchronous writing is the simplest way to send the data using a socket provided by Boost.Asio. The methods and functions that perform synchronous writing to the socket block the thread of execution and do not return until the data (at least some amount of data) is written to the socket or an error occurs.

In this recipe, we will see how to write data to a TCP socket synchronously.

How to do it…

The most basic way to write to the socket provided by the Boost.Asio library is to use the write_some() method of the asio::ip::tcp::socket class. Here is the declaration of one of the method's overloads:

template<
typename ConstBufferSequence>
std::size_t write_some(
const ConstBufferSequence & buffers);

This method accepts an object that represents a composite buffer as an argument, and as its name suggests, writes some...

Reading from a TCP socket synchronously

Reading from a TCP socket is an input operation that is used to receive data sent by the remote application connected to this socket. Synchronous reading is the simplest way to receive the data using a socket provided by Boost.Asio. The methods and functions that perform synchronous reading from the socket blocks the thread of execution and doesn't return until the data (at least some amount of data) is read from the socket or an error occurs.

In this recipe, we will see how to read data from a TCP socket synchronously.

How to do it…

The most basic way to read data from the socket provided by the Boost.Asio library is the read_some() method of the asio::ip::tcp::socket class. Let's take a look at one of the method's overloads:

template<
typename MutableBufferSequence>
std::size_t read_some(
    const MutableBufferSequence & buffers);

This method accepts an object that represents a writable buffer (single or composite) as...

Writing to a TCP socket asynchronously

Asynchronous writing is a flexible and efficient way to send data to a remote application. In this recipe, we will see how to write data to a TCP socket asynchronously.

How to do it…

The most basic tool used to asynchronously write data to the socket provided by the Boost.Asio library is the async_write_some() method of the asio::ip::tcp::socket class. Let's take a look at one of the method's overloads:

template<
    typename ConstBufferSequence,
    typename WriteHandler>
void async_write_some(
    const ConstBufferSequence & buffers,
    WriteHandler handler);

This method initiates the write operation and returns immediately. It accepts an object that represents a buffer that contains the data to be written to the socket as its first argument. The second argument is a callback, which will be called by Boost.Asio when an initiated operation is completed. This argument can be a function pointer, functor, or any other object that...

Introduction

I/O operations are the key operations in the networking infrastructure of any distributed application. They are directly involved in the process of data exchange. Input operations are used to receive data from remote applications, whereas output operations allow sending data to them.

In this chapter, we will see several recipes that show how to perform I/O operations and other operations related to them. In addition to this, we'll see how to use some classes provided by Boost.Asio, which are used in conjunction with I/O operations.

The following is the short summary and introduction to the topics discussed in this chapter.

I/O buffers

Network programming is all about organizing inter-process communication over a computer network. Communication in this context implies exchanging data between two or more processes. From the perspective of a process that participates in such communication, the process performs I/O operations, sending data to and receiving it from other participating...

Using fixed length I/O buffers

Fixed length I/O buffers are usually used with I/O operations and play the role of either a data source or destination when the size of the message to be sent or received is known. For example, this can be a constant array of chars allocated on a stack, which contain a string that represents the request to be sent to the server. Or, this can be a writable buffer allocated in the free memory, which is used as a data destination point, when reading data from a socket.

In this recipe, we'll see how to represent fixed length buffers so that they can be used with Boost.Asio I/O operations.

How to do it…

In Boost.Asio, a fixed length buffer is represented by one of the two classes: asio::mutable_buffer or asio::const_buffer. Both these classes represent a contiguous block of memory that is specified by the address of the first byte of the block and its size in bytes. As the names of these classes suggest, asio::mutable_buffer represents a writable buffer, whereas asio...

Using extensible stream-oriented I/O buffers

Extensible buffers are those buffers that dynamically increase their size when new data is written to them. They are usually used to read data from sockets when the size of the incoming message is unknown.

Some application layer protocols do not define the exact size of the message. Instead, the boundary of the message is represented by a specific sequence of symbols at the end of the message itself or by a transport protocol service message end of file (EOF) issued by the sender after it finishes sending the message.

For example, according to the HTTP protocol, the header section of the request and response messages don't have a fixed length and its boundary is represented by a sequence of four ASCII symbols, <CR><LF><CR><LF>, which is part of the message. In such cases, dynamically extensible buffers and functions that can work with them, which are provided by the Boost.Asio library, are very useful.

In this recipe, we will...

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Key benefits

  • Build highly efficient distributed applications with ease
  • Enhance your cross-platform network programming skills with one of the most reputable C++ libraries
  • Find solutions to real-world problems related to network programming with ready-to-use recipes using this detailed and practical handbook

Description

Starting with recipes demonstrating the execution of basic Boost.Asio operations, the book goes on to provide ready-to-use implementations of client and server applications from simple synchronous ones to powerful multithreaded scalable solutions. Finally, you are presented with advanced topics such as implementing a chat application, implementing an HTTP client, and adding SSL support. All the samples presented in the book are ready to be used in real projects just out of the box. As well as excellent practical examples, the book also includes extended supportive theoretical material on distributed application design and construction.

Who is this book for?

If you want to enhance your C++ network programming skills using the Boost.Asio library and understand the theory behind development of distributed applications, this book is just what you need. The prerequisite for this book is experience with general C++11. To get the most from the book and comprehend advanced topics, you will need some background experience in multithreading.

What you will learn

  • Boost your working knowledge of one of the most reputable C++ networking libraries—Boost.Asio
  • Familiarize yourself with the basics of TCP and UDP protocols
  • Create scalable and highly-efficient client and server applications
  • Understand the theory behind development of distributed applications
  • Increase the security of your distributed applications by adding SSL support
  • Implement a HTTP client easily
  • Use iostreams, scatter-gather buffers, and timers

Product Details

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Publication date : Jan 25, 2016
Length: 248 pages
Edition : 1st
Language : English
ISBN-13 : 9781783986552
Category :
Cloud & Networking
Languages :
C++
Concepts :
Networking
Tools :
Visual Studio

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Publication date : Jan 25, 2016
Length: 248 pages
Edition : 1st
Language : English
ISBN-13 : 9781783986552
Category :
Cloud & Networking
Languages :
C++
Concepts :
Networking
Tools :
Visual Studio

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Boost.Asio C++ Network Programming Cookbook
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Table of Contents

7 Chapters
1. The Basics Chevron down icon Chevron up icon
1. The Basics
Introduction
Creating an endpoint
Creating an active socket
Creating a passive socket
Resolving a DNS name
Binding a socket to an endpoint
Connecting a socket
Accepting connections
2. I/O Operations Chevron down icon Chevron up icon
2. I/O Operations
Introduction
Using fixed length I/O buffers
Using extensible stream-oriented I/O buffers
Writing to a TCP socket synchronously
Reading from a TCP socket synchronously
Writing to a TCP socket asynchronously
Reading from a TCP socket asynchronously
Canceling asynchronous operations
Shutting down and closing a socket
3. Implementing Client Applications Chevron down icon Chevron up icon
3. Implementing Client Applications
Introduction
Implementing a synchronous TCP client
Implementing a synchronous UDP client
Implementing an asynchronous TCP client
4. Implementing Server Applications Chevron down icon Chevron up icon
4. Implementing Server Applications
Introduction
Implementing a synchronous iterative TCP server
Implementing a synchronous parallel TCP server
Implementing an asynchronous TCP server
5. HTTP and SSL/TLS Chevron down icon Chevron up icon
5. HTTP and SSL/TLS
Introduction
Implementing the HTTP client application
Implementing the HTTP server application
Adding SSL/TLS support to client applications
Adding SSL/TLS support to server applications
6. Other Topics Chevron down icon Chevron up icon
6. Other Topics
Introduction
Using composite buffers for scatter/gather operations
Using timers
Getting and setting socket options
Performing a stream-based I/O
Index Chevron down icon Chevron up icon
Index

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SuJo Feb 27, 2016
Full star icon Full star icon Full star icon Full star icon Full star icon 5
The Boost library is really well laid out and really great for starting up a project quickly, however it takes time to get used to it and learn the ins and outs. I highly recommend this cookbook once you get your feet wet with networked communications between clients and servers. This cookbook delivers and the author knows the library rather well, and the best part is the code from the book works! Highly recommend this book.
Amazon Verified review Amazon
Amazon Customer Feb 23, 2016
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Great book to get familiar with Asio.Code examples form publisher's site make exploration much faster and productive.Will recommend this book if you already familiar with C++ and Boost and want to dive into C++ networking.
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José Santana Feb 20, 2022
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It's in the headline.The book contents is good, but the formatting is atrocious.
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Kalinda Mar 08, 2024
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I found this book approachable to someone totally ignorant of Boost.Asio. For younger readers, it provides useful historical background over _why_ Boost.Asio exists. For more experienced programmers, it's worth keeping around as a reference source to quickly use one of its recipes.Bonus points for using C++17 and sensible object-oriented design decisions in a networking context. Both of these were hard to find in a Boost.Asio tutorial when I first bought this book.
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sreeraj c Sep 11, 2016
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This is one of the best Boost.Asio library book in the market. It teaches you things in step by step fashion. Must read I say.
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About the author

Profile icon Radchuk
Radchuk
Dmytro Radchuk is a software engineer from Kyiv, Ukraine. His passion for science started at a young age and led him to receive a degree in computer science from Kyiv Polytechnic University. As of today, he has deep technical knowledge and more than 8 years of experience in the field of software development for several industries and businesses. He strongly believes that the whole is greater than the sum of its parts and this is one of the reasons why the development of distributed applications has become his main specialization. Dmytro has always supported the idea of sharing knowledge and this has resulted in Boost.Asio C++ Network Programming Cookbook, which has become his first officially published book. He believes that science will help us deal with the monotony of everyday life. When he is not exploring another facet of computer engineering, he is probably learning a new aspect of psychology, history, or the arts, which are also of great interest to him.
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  • They are lower price than print
  • They save resources and space
What is an eBook? Chevron down icon Chevron up icon

Packt eBooks are a complete electronic version of the print edition, available in PDF and ePub formats. Every piece of content down to the page numbering is the same. Because we save the costs of printing and shipping the book to you, we are able to offer eBooks at a lower cost than print editions.

When you have purchased an eBook, simply login to your account and click on the link in Your Download Area. We recommend you saving the file to your hard drive before opening it.

For optimal viewing of our eBooks, we recommend you download and install the free Adobe Reader version 9.