or see this http://forum.lazarus.freepascal.org/index.php/topic,17506.msg110917.html#msg110917
On Sat, Nov 7, 2015 at 1:07 PM, Mark Morgan Lloyd <[email protected]> wrote: > Bo Berglund wrote: >> >> I would like to be able to find out the public IP address of the Pi in >> a Lazarus program. >> How can this be accomplished? >> It is either connected to a wired or WiFi network router. >> in my browser I can go to http://checkip.dyndns.com/ and it will print >> a message with my IP address. >> But how is this done in code? > > > Avoid relying on this in the general case: you can usually use 0.0.0.0 to > represent "this host". The problem is that a machine might have multiple > physical Ethernet (or other) adapters, and in addition might have aliases > set up, and in the general case it's not easy to look at the list of IP > addresses and determine which one you want. > > http://forum.lazarus.freepascal.org/index.php?topic=20556.0 looks like a > good starting point, although it's oriented towards Windows. If you're > really looking for "/the/" address then I think you might end up parsing the > routing table (left as an exercise :-) and finding which local IP address > talks to the default gateway... which itself gets messy since there might be > multiple prioritised gateways. And then there's IP6 to consider. > > Word of advise: don't try arithmetic operations on IP addresses, and in > particular don't speculate on "next hops" etc. based on what you know about > your local network. > > -- > Mark Morgan Lloyd > markMLl .AT. telemetry.co .DOT. uk > > [Opinions above are the author's, not those of his employers or colleagues] > > > -- > _______________________________________________ > Lazarus mailing list > [email protected] > http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus -- _______________________________________________ Lazarus mailing list [email protected] http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
