On Dec 8, 2006, at 1:05 PM, David Bovill wrote:
Is there a simple way of obtaining the IP address of the current
computer?
Yes.
Oh, you want to know what it is? Since you say "the" IP address, I
assume you are expecting a single address.
Sarah mentioned this one and probably got it from someone who was
perhaps inspired by my comments:
function getLocalIPAddress
put "255.255.255.255:6000" into tCheckAddress
open datagram socket to tCheckAddress
put the hostAddress of tCheckAddress into tMyIP
close socket tCheckAddress
return tMyIP
end getLocalIPAddress
A bug was introduced into OS X that causes an error if you try to
write to a broadcast address, but that is not be needed.
In special cases, a computer might have multiple IP addresses, as in
the case of a firewall or a computer using dialup and a LAN at the
same time. If you have multiple IP addresses on the computer, you
can get the one that would be used to route to some address by using
that address instead of 255.255.255.255, the broadcast address. For
example, you can get the one for Internet by using a non private
Internet address. Alternately, if your DHCP server's private IP
address is known, you can use that to get to get the private IP address.
The broadcast will get you the "primary" IP address, whatever that
means.
The ability to get the hostAddress was fixed on OS X at some point so
this won't work in old versions.
This does no communication. It is not intrusive. You can use some
IP address without even touching the associated computer. That
computer and your routers do not even have to be up.
Dar
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