write a C++ code to get the hostname

Question

我想编写一个C ++代码来获取有关所有主机名的完整信息，以及已添加到域控件中的计算机的IP地址和子网掩码。

Answer 1

gethostname will give you the name of the current host

gethostbyname looks up the host with a particular name and will give you the address

man 3 gethostname
man 3 gethostbyname

Or you can extract the information you need from the system like this :

#include <cstdlib>
#include <iostream>
#include <fstream>

int main(){
  system( "ifconfig -a | grep inet | "
      "sed 's/\\([ ]*[^ ]*\\)\\([ ]*[^ ]*\\).*$/\\1 \\2/' "
      " > networkinfos.txt" ) ;
}