[Qt-interest] Checking if connected to the network

[Thiago Macieira]

Ann Marie wrote:
>Could someone provide me with some information/sample code on how my qt
>applicatoin can check and see if the machine it is running on is
> connected to the network?

In general, probing a medium to check if you can use the medium isn't very 
effective. I'd suggest you simply try to do what you were going to do 
before. [*]

Besides the fact that Qt doesn't have any "am I connected" API, there are 
a number of reasons why attempting to check that will not work. First of 
all, you could be connected to a network, but that network isn't connected 
to the Internet. Second, you could be connected to the wrong network, or 
not connected to enough networks yet (multihomed systems). Some systems 
even report that the connection is up, while they have no connection at 
all.

So, my recommendation is that you simply do what you were going to do if 
you were connected. And if that operation fails, you're not connected to 
the right networks.

[*] For example, here's how this applies to mailing lists: don't send an 
email "test" to check if you can post to a mailing list. Instead, send the 
email you were going to send if your test had succeeded. If it doesn't 
arrive or it bounces, then you can't post.

-- 
Thiago Macieira - thiago.macieira (AT) nokia.com
  Senior Product Manager - Nokia, Qt Software
      Sandakerveien 116, NO-0402 Oslo, Norway
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