Find IP address of computer

Programming Questions

eneo5541

in Programming Questions • 3 years ago

Hi all.

I'm writing a sketch I intend to compile into an applet.
I need to find the IP address of the computer currently running the sketch.

I've tried using client.ip(), but I don't think that's really what I'm after.
Has anyone had any experience or (even better) success with this sort of thing?

Thanks!

Replies(3)

PhiLho

Re: Find IP address of computer

3 years ago

First, I don't know why you need the IP address to run a sketch as an applet. Perhaps the two information are unrelated...
Second, you can use 127.0.0.1, it should always work to communicate with itself.
But, if, as I guess seeing "client", you try to connect two computers via the network, you can see the local IP address using your OS information. On Windows, typing ipconfig on the command line gives the information. On Unix-based system, I think it is ifconfig IIRC.
If you need the external IP address (as seen by Web sites you go to), you have to go to a site providing back the information, like http://findmyip.com/ or http://www.netikus.net/show_ip.html (the latter is interesting as it returns the raw information, no need to extract it from the Web page).

kooogy

Re: Find IP address of computer

3 years ago

i think (s)he wants to get the ip address of the host from within processing.

the standard java way is to use java.net.InetAddress

http://www.devx.com/tips/Tip/13284

(although you probably want .getHostAddress() rather than .getHostName())

eneo5541

Re: Find IP address of computer

3 years ago

Hey, thanks a bunch guys - that's perfect!

PhilHo, I mentioned that I was compiling it into an applet, because I wasn't sure if Java applets were allowed to access that sort of stuff (since I had trouble writing to an XML file as an applet before)

Currently, the program has to check its own IP against a list of IPs in an external file.

I should be good to go now - thanks again guys!