John Patten wrote:
Hi All!
I'm making a little web browser client that needs to check the
contents of a file on a web server. It needs to be able to do this
every 5 seconds or so in the background, and then if the contents
changes in the last line of the file it is checking, it starts another
process in the background. Can this be done in Rev? Would I use two
stacks, one as the browser and one with the repeat loop?
I'm at a loss for what this might look like in a script?
Hi John,
Are you familiar with the "send" command? If not, I think you're about
to be... ;o)
-- prep: since you're looking for a change in data values,
-- you need to store its initial value so you have something
-- to compare to
global gOriginalData
-- and the data check has to be put into motion:
on openCard
-- store initial value
put url "http://my.website.com/targetfile.txt"; into gOriginalData
-- put the data check into motion
send "checkWebFile" to me in 5 secs
end openCard
-- the data check
on checkWebFile
-- get fresh copy of the data
put url "http://my.website.com/targetfile.txt"; into tCurrData
if (last line of tCurrData <> last line of gOriginalData) then
send ("startOtherProcess" && tCurrData) to me in 1 sec
else -- data hasn't changed, so schedule another check
send "checkWebFile" to me in 5 secs
end if
end checkWebFile
-- the other background process
on startOtherProcess pChangedData
-- do your other stuff here
end startOtherProcess
The "send... in" construct 'disconnects' the calling and called handlers
from each other, so the calling one can finish executing before the
called one starts. And by saying "in 5 secs", you insert idle time when
the UI can be refreshed & interacted with. It keeps the user from being
locked out of the UI due to continuous running of code you might have if
you tried using a repeat loop for data checks.
Hopefully this will get you started.
Thanks in Advance!
John Patten
--
Phil Davis
PDS Labs
Professional Software Development
http://pdslabs.net
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