OpenEuphoria

System Ping (to resolve DNS)

• Posted by Mark Moran <mdmoran at kpmg.ca> Jul 30, 2002
• 549 views

Hi folks

As part of an Internet client/server set of apps that I'm working on, 
I'm including a function to resolve the domain name to the associated 
IP.  (btw, I'm using win32lib and eulibnet includes at the moment.)

The way I've done it (certainly not the easiest, but it's the only way I 
could easily figure to do it) is to call the system's PING command 
(i.e., system("ping domain.com > pingresult.txt", i) - and can't 
remember whether I'm using 1, 2, or 3 as "i", but doesn't matter).  

Then I open this pingresult.txt file for reading within my program, and 
get the IP from the second line, which is between the "[" and "]".  Kind 
of kludgy (sp?), but it works.

What I don't like, other than the obvious kludginess of the coding to do 
all this, is that it opens a console window when it calls the system 
command -- not very elegant when the rest of the program is a 
nice-looking (IMHO) window.

>From the documentation, I 'think' system_exec() doesn't open a console, 
but it also says that re-direction cannot be used.  I'd have to test it 
of course, but...

Surely there's a more elegant way to do Internet resolution of domain 
names.  Do any of you know something that'll work entirely within the 
windows program (i.e., no additional console), and might be something as 
simple as:

include dns.e
sequence IPaddress
dns_resolve(domain.com)
IPaddress = whatIsReturnedFromdns_resolve

As mentioned, I'm using eulibnet, but I don't see anything in there that 
might do it (although I haven't fully inspected eulibnet.ew) -- perhaps 
there's something in tcp4u.ew?

Thanks in advance folks.

Mark.