We have to talk to a piece of legacy code in the middle of a display
handler. We do this by writing a file to disk - which contains the query the
customer has entered. The legacy code sees the file, works out the answer
(which can take a few seconds if it's a complex query), and then writes a
reply file for us to read and display. We have plans to make this legacy
code into a DLL which we can call, but that will not happen for several
weeks - we go live in two!
The problem is, what is the best way to wait for the reply file to arrive?
Ideally I would want it to be event driven - say by settings a Windows timer
to fire after .25 of a second, look if the file has arrived, wait for
another event - but that doesn't sit nicely into CF / Spectra. Right now we
have a CPU intensive loop where we simply loop round until tickcount has
advanced by 250 then we look for the file, which we know is an awful
solution for a load of reasons.
We did try using cfsleep (which I think came from the tag gallery), but
using that caused our next cfquery to fail with a timeout. So, is anyone
aware of a 'proper' non-CPU intensive way of waiting a while in the middle
of a display handler?
Thanks in advance,
Alan Ford
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