OpenEuphoria

Re: wxEuphoria--is_connected(atom socket)

• Posted by Mario Steele <eumario at trilake.net> Apr 06, 2005
• 424 views

Ahh, the age old question, What is a socket, and why do they call it a socket?

Well, in the simplistic of terms, we'll use a Regular phone as an example.

Think of a Client, as you calling a friend.  Your friend would be considered the
server.  Basically, it's up to your friend weither he wants to talk with you or
not, so he would either answer the phone, or not answer it.  This terminology
applies to a server.  When you develop a client, it places a call to the server,
requesting a confrence.  Depending on weither or not the server is listening for
the call, or willing to accept your client's call, it'll answer it, and begin
the transmission of data, or in the case of the Phone call, pick up, and start
talking.

Why is it Called a socket?

Well, it's called a socket, because it was the ideal back in 88 or so, that
when you make a connection between two computers, your basically plugging
one computer into another, and that other one has to have a "socket" that the
connection can fit into.  And the same follows for the socket that you use
today in TCP/IP Communications.  Basically the socket will either connect,
if it can fit into the socket on the server, or it'll fail.  Simple as that,
eh?

Basically, to determin weither or not your connected to the internet, as
pre-suggested by Matt, you follow the method of something like this:

include wxEuphoria.e
include wxNet.e

object void

constant cip = create( wxIPV4address, {} ),
         client = create( wxSocketClient, wxSOCKET_WAITALL )

void = set_ip_host(cip, "64.233.167.104") -- ping www.google.com
void = set_ip_service(cip, 80) -- Web Server Port
if socket_connect(client,cip,1) = 0 then
    puts(1,"You are not connected to the internet!")
else
    delete_instance(client)
    puts(1,"You are connected to the internet!")
end if
machine_proc(26,0) -- wait_key()

That would be the easy example, and un-tested, as I'm still not familiar
with wxEuphoria yet.

Mario Steele
http://enchantedblade.trilake.net
Attaining World Dominiation, one byte at a time...