[Qt-interest] how to detect interenet connection ? or that the internet is down

[Nikos Chantziaras]

On 04/11/2010 03:32 PM, Meir Yanovich wrote:
> Hello all
> im developing desktop application that using internet heavlly , but now
> i need to develop mechanizem
> to detect that the internet connection is down , that mean i can't
> connect to the internet
> what is the best way to implement  such mechanism ?

Well, the "best" way would probably be UPnP (which also is the only way 
to detect whether there's internet connectivity).  Qt does not offer any 
interface for UPnP, you would have to write a UPnP parser yourself or 
adapt someone else's.

This requires that the user that is running your application has a UPnP 
capable (DSL)modem and that the UPnP functionality is enabled on it 
(it's disabled on many systems due to security flaws in UPnP).

With all that being said, it's not worth the effort.  Simply assume the 
user has Internet connectivity and gracefully handle any errors that occur.