下面的源碼給出了使用boost::asio進行域名解析的方法.

//g++ -g resolver_demo.cpp -o resolver_demo -lboost_system -lpthread
//#include <iostream>
#include <boost/asio.hpp>
#include <boost/system/error_code.hpp>
#include <boost/lexical_cast.hpp>using namespace std;
using namespace boost::asio;void resolv_connect(io_service& ios, ip::tcp::socket& sock, const char* host, int port){ip::tcp::resolver rslv(ios);ip::tcp::resolver::query qry(host, boost::lexical_cast<string>(port));cout << "host_name: " << qry.host_name() << ", service_name: " << qry.service_name() << endl;ip::tcp::resolver::iterator iter = rslv.resolve(qry);ip::tcp::resolver::iterator end;boost::system::error_code ec = error::host_not_found;for( ; ec&&iter!=end; ++iter){sock.close();sock.connect(*iter, ec);}if(ec){cout << "cannot connect" << endl;throw boost::system::system_error(ec);}else if(iter != end){ip::tcp::endpoint endpoint = iter->endpoint();cout << "query success!" << endl;cout << "host_ip: " << endpoint.address() << ", port: " << endpoint.port() << endl;}elsereturn;
}int main(){try{io_service ios;ip::tcp::socket sock(ios);resolv_connect(ios, sock, "news.sohu.com", 80);}catch(exception& e){cerr << e.what() << endl;return 1;}return 0;
}

下面是運行截圖

總結

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