How to get the hostname of an ip address by using asio library?

问题:

I am trying to get hostname from UDP endpoint. However I do not know whether boost.asio supports IP->hostname conversion. Anyone can answer my question?

回答1:

getnameinfo is what you want.

getnameinfo((sockaddr*)&addr, sizeof(addr), hostname, sizeof(hostname), NULL, NULL, 0); 

回答2:

#include<asio.hpp> #include<exception> #include<iostream>  int main() { try {     asio::io_service io_service;     asio::ip::udp::resolver rsv(io_service);     for(const auto &ele : rsv.resolve(asio::ip::udp::endpoint(asio::ip::address_v4({192,168,1,163}),0)))     {         std::cout<<ele.host_name()<<'\n';     }  } catch(const std::exception &e) {     std::cerr<<e.what()<<'\n';     return 1; } } 

I have found out how to get host name by ip. Just directly resolve endpoint by using ip address

文章来源: How to get the hostname of an ip address by using asio library?