boost::asio

C++ boost

ネットワーク通信を簡易に行えるすごいライブラリ。
中の人がネットワークについてさっぱり理解していないので、これぐらいの認識です。

#include <iostream>

#include <boost/asio.hpp>

#include <boost/range/algorithm/for_each.hpp>

#include <pstade/oven/stream_lines.hpp>

int
main(){
	namespace asio = boost::asio;
	namespace oven = pstade::oven;
	
	// http://www.boost.org/LICENSE_1_0.txt を取得する
	asio::ip::tcp::iostream	tcp_iso("www.boost.org", "http");

	// 送信
	tcp_iso << "GET /LICENSE_1_0.txt HTTP/1.0\r\n";
	tcp_iso << "Host: www.boost.org\r\n";
	tcp_iso << "\r\n";
	tcp_iso << std::flush;
	
	// 受信
	boost::for_each(oven::stream_lines(tcp_iso), [](const std::string& str){
		std::cout << str << std::endl;
	});

	return 0;
}

出力：

HTTP/1.1 200 OK
Date: Wed, 29 Sep 2010 02:30:07 GMT
Server: Apache/2.0.52 (Red Hat)
Last-Modified: Fri, 28 Mar 2008 17:26:33 GMT
ETag: "110cc4a-53a-9a786440"
Accept-Ranges: bytes
Content-Length: 1338
Vary: Accept-Encoding
Cache-Control: max-age=3000000, public, must-revalidate
Expires: Fri, 31 Dec 2010 20:00:00 GMT
Connection: close
Content-Type: text/plain

Boost Software License - Version 1.0 - August 17th, 2003

Permission is hereby granted, free of charge, to any person or organization
obtaining a copy of the software and accompanying documentation covered by
this license (the "Software") to use, reproduce, display, distribute,
execute, and transmit the Software, and to prepare derivative works of the
Software, and to permit third-parties to whom the Software is furnished to
do so, all subject to the following:

The copyright notices in the Software and this entire statement, including
the above license grant, this restriction and the following disclaimer,
must be included in all copies of the Software, in whole or in part, and
all derivative works of the Software, unless such copies or derivative
works are solely in the form of machine-executable object code generated by
a source language processor.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.

今回は、受信したデータをそのまま出力してるけど、本来であれば受信したデータに付いてるヘッダー情報なんかも解析しないとダメみたい。
そこら辺は、魔導書の『Boost.AsioによるHTTP通信入門』に詳しく載っているので、本格的に通信をやりたいなら読んでみると面白い。


しかし、こうやって触ってると俄然、サーバ間通信とかやってみたくなる。
WindowsやLinuxなどの環境に左右されずに同じコーディングが出来るのがいいね。
例によってゲームの実機だとネットワーク周りの実装はどうなってるのかがすごく気になる。
まぁ最悪サーバ側だけでもこのライブラリで実装できるのかな？


[boost]
ver 1.44.0
[参照]
http://www.kmonos.net/alang/boost/classes/asio.html