在C ++中索引Linux命令的输出

Question

I want to get the ip address given url.

I am currently using this

        std::string i;
        std::string pingStr = (std::string)"nslookup " +"www.yahoo.com" ;
        i = system (pingStr.c_str());

but the output is

Server:     127.0.1.1
Address:    127.0.1.1#53

Non-authoritative answer:
www.yahoo.com   canonical name = atsv2-fp-shed.wg1.b.yahoo.com.
Name:   atsv2-fp-shed.wg1.b.yahoo.com
Address: 106.10.250.10

Q : Is there anyway I can only get the Ip address ?

Answer 1

使用getaddrinfo（3）函数以可用形式查找IP地址（IPv4或IPv6）。

Answer 2

you can use the folowing command.

nslookup www.yahoo.com | grep Address: |  sed -n 2p

grep Address gives you all lines having "address" word in them

sed gets the 2nd line of those 2

You can truncate the "Address" part of output in c++.