any way to detect condition "connected to ISP but not internet"?
josh at dvcreators.net
Mon Jan 26 15:02:04 CST 2009
I agree, the separate process is the key to prevent the app freeze.
Thanks for your input, I will post when we have finalized a method.
And again, this wouldn't be so big a deal except that you NEVER want a
paying customer to have dead software they can't use.
On Jan 23, 2009, at 5:07 PM, Alex Tweedly wrote:
> Andre Garzia wrote:
>> we can use the load command in async mode and check the status... it
>> should timeout right?
> right. maybe.
> (remember there's a lot of speculation on my part, about this being
> a DNS problem ....)
> Although the load url ... with callback is intended to be non-
> blocking, there may be a difficulty. I'm sure it uses sockets and
> the socket async mode to be non-blocking - and I suspect the problem
> is an OS call to DNSresolve() [or similar] which is happens before
> the scket/TCP open, and which is blocking. Since this affects (even)
> a browser, I worry it would also affect Rev - so it might just
> result in a blocked process. (and even if it's not DNS, whatever it
> is fails within a browser, so may fail similarly within Rev)
> To feel safe, I'd want to do the network check in a separate
> process, and have a fail-safe mechanism within the real app (i.e. it
> detects failure rather than waiting for it). So I'd use a
> backgrounded shell command which creates a temp file, and have the
> real app check for that file being created/updated. Could be a ping
> shell command, or a small standalone which loads a url, or anything
> similar - as long as it's a separate process.
> -- Alex.
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