POCO库中文编程参考指南（9）Poco::Net::DNS

1 Poco::Net::DNS

namespace Poco {namespace Net {class Net_API DNS {public: ???static HostEntry hostByName(const std::string& hostname); ???static HostEntry hostByAddress(const IPAddress& address); ???static HostEntry resolve(const std::string& address); ???static IPAddress resolveOne(const std::string& address); ???static HostEntry thisHost(); ???static std::string hostName();};}}

HostEntry 中存储 host primary name（canonical name）、alias name list、IP address list。

2 相关 API

得到一个 HostEntry 实例：

const HostEntry& entry = DNS::hostByName("google.com");

输出域名：

std::cout << entry.name() << std::endl;

Address 和 Alias：

const HostEntry::AliasList& aliases = entry.aliases();const HostEntry::AddressList& addrs = entry.addresses();

3 Source code

POCO 的官方文档中的 Sample 有错误，以下提供一个正确的示例，其中域名是通过参数传入的。

#include "Poco/Net/DNS.h"#include <iostream>using Poco::Net::DNS;using Poco::Net::IPAddress;using Poco::Net::HostEntry;int main(int argc, char** argv){ ???if (argc != 2) { ???????std::cout << "Invalid argument number." << std::endl; ???} ???const HostEntry& entry = DNS::hostByName(argv[1]); ???std::cout << "Canonical Name: " << entry.name() << std::endl; ???const HostEntry::AliasList& aliases = entry.aliases(); ???for (HostEntry::AliasList::const_iterator it = aliases.begin(); ???????it != ??aliases.end(); ++it) ???????std::cout << "Alias: " << *it << std::endl; ???const HostEntry::AddressList& addrs = entry.addresses(); ???for (HostEntry::AddressList::const_iterator it = addrs.begin(); ???????it != ??addrs.end(); ++it) ???????std::cout << "Address: " << it->toString() << std::endl; ???return 0;}

编译：

$ g++ name_solver.cpp -o name_solver -I/usr/local/include -I/usr/local/lib -lPocoNet

运行：

$ ./name_solver baidu.comCanonical Name: baidu.comAddress: 123.125.114.144Address: 123.125.114.144Address: 220.181.111.85Address: 220.181.111.85Address: 220.181.111.86Address: 220.181.111.86$ ./name_solver www.ustc.edu.cnCanonical Name: ustc.edu.cnAddress: 202.38.64.246Address: 202.38.64.246

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POCO库中文编程参考指南（9）Poco::Net::DNS

原文地址：http://www.cnblogs.com/lidabo/p/7612083.html