get global ip address

Question

如何获得（在C ++中）我的计算机的全局 IP地址（Windows XP）？

Answer 1

You can't.

You can determine the IP addresses on the various interfaces, and there may be more than one. These could be local area network IPs (10.0.0.0/8, 192.168.0.0/16, etc.), or they might be internet routable.

You seem to be asking "if I have 192.168.0.3, how do I get my Internet IP?" There is not function call to do this: such an IP might exist, it might not exist, there might even be more than one.

The closest you can get is to have a known computer on the Internet tell you: connect to some other machine, and ask them to send back what they think your IP address is. There are a few websites out there for this, some might even have APIs to do this.

I feel like some home-routers might be able to tell you through uPnP too, but again, this will not cover all possible cases.

Answer 2

使用此纯文本IP url： get ip

Answer 3

On windows you need to get the local host name and then pass that to the gethostbyname function in winsock2 which returns the associated IP addresses.

Example: http://tangentsoft.net/wskfaq/examples/ipaddr.html

A stack overflow answer for Linux:

Get the IP address of the machine

Answer 4

您必须向http://whatismyipaddress.com/等网站发出请求，并在其中提取显示您的IP的字符串。