[Interest] Unique - Hardware bound - ID

Konrad Rosenbaum konrad at silmor.de
Wed May 15 12:52:58 CEST 2013

On Tuesday 14 May 2013 22:27:23 Alex Malyushytskyy wrote:
> Such things are normally resolved using MAC address on any system, which is
> unique for every network adapter,
> But there always may be a system which does not have network adapter, have
> a few network adapters or does not let you to obtain MAC address unless you
> are  a root (Linux)
> I do not think Qt support this, but if not counting some complications
> listed above, native for system code you will have to right is easy.

You can get MAC addresses via QNetworkInterface::allInterfaces().

Some encouragement: 99.9% of all PCs and Laptops do have a network card and/or 
Wireless Interface. Unless you target the 0.1% of non-networked machines you 
can assume to have one (even if it is unconfigured). At the very least if your 
app has network access then you can assume ethernet (modem-only machines are 
exceedingly rare these days).

Some words of caution: MAC addresses can be changed in software. Depending on 
your paranoia level you may not want to rely on them - in that case you may 
want to think about hardware dongles to secure your app.

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