[Qt-interest] Qt C/S Model , howto detect each other ?

[Arnold Krille]

Hi,

On Wednesday 14 April 2010 07:30:22 Aaron Lewis wrote:
> 	Which means once you setup an server , you are also the clients , but
> you've got some privileges ;-)
> 	For Clients , How do i get to know if there's a serer on the same
> network range ?
> 	So far i've got 2 ways , which i thought's not so good.
> 	I) Scan for ports .. bad on speed performances
> 	II) Send BroadCasts , any machine who can parse our packet is my friends
> 	Any other good ways ?

Take a look at upnp and bonjour aka avahi aka zeroconf. These are two of the 
biggest zero-configuration protocols.
I use zeroconf in some of my projects and its just nice to have clients find 
the (local) servers without any trouble or manual configuration... I tried 
using the avahi-libs for the implementation but then I realized that I wanted 
it to run on macos and possibly win too, so using the QtBonjour-example from 
some Qt-quarterly was better...

Of course that only works in local networks, to access remote systems you have 
to enter names or ip-addresses by hand or get a list of servers from a public 
server with http or something.

Have fun,

Arnold
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