使用boost解析域名服务

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下面的源码给出了使用boost::asio进行域名解析的方法.

//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;    }    else        return;}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;}

下面是运行截图

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