Thanks Phil and Bjoernke!
That's what I needed..."send" command. Seems so obvious when you see
someone else explain it :-)
Now, that I understand send, here's my dilemma. What I'm trying to
create is a little app that allows a teacher in the classroom to push
out a web site they have loaded in their "teacher" browser out to to
all 32 student laptops in their classroom. I thought this would be a
perfect implementation for revBrowser, a custom web browser. I
remember in the past struggling with Rev and opening sockets to try to
get two Rev stacks to talk to each other. I never had very much
success with that process so I thought I would try to keep it real
basic and utilize web sharing and writing out a text file with the
teacher's current web site address and time stamp to the local "web
sites" folder. The client (student) computers would check that text
file every 5 seconds, continually, and then if the time stamp is
different from the last web address and time stamp, load the new web
address in the client (student) browser. The key word in those run on
sentences is "continually."
In the examples shared, the scripts handlers are opencard and
mousedown. They only run, essentially, one time through and after the
time stamp is different, the script would end.
I started to mess with an idle handler, but that gets messy real
quick. Is what I'm describing possible? To have a script run
continually in the background over and over? Or, maybe I'm going at
this custom teacher to student web browser thing all wrong? Any ideas
greatly appreciated!
Thank you!
John Patten
On May 7, 2009, at 10:00 AM, use-revolution-requ...@lists.runrev.com
wrote:
5. Re: Repeat Process To Check Contents of File on HTTP Server?
(Phil Davis)
12. Re: Repeat Process To Check Contents of File on HTTP Server?
(Bj?rnke von Gierke)
------------------------------
Message: 5
Date: Wed, 06 May 2009 23:31:52 -0700
From: Phil Davis <rev...@pdslabs.net>
Subject: Re: Repeat Process To Check Contents of File on HTTP Server?
To: How to use Revolution <use-revolution@lists.runrev.com>
Message-ID: <4a028058.9010...@pdslabs.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
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
------------------------------
Message: 12
Date: Thu, 07 May 2009 15:34:20 +0200
From: Bj?rnke von Gierke <b...@mac.com>
Subject: Re: Repeat Process To Check Contents of File on HTTP Server?
To: How to use Revolution <use-revolution@lists.runrev.com>
Message-ID: <b4a2fc5f-2523-4d98-8818-784299b14...@mac.com>
Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes
I suggest to use the "put" command with the "url" keyword, using a
"send in time" structure:
on mouseUp
checkWebsite ""
end mouseUp
on checkWebsite thePrev
put line -1 of url "http://yoursite.com/yourfile"; into theCurrent
if thePrev <> theCurrent then
--do your stuff here, it changed!
end if
send checkWebsite theCurrent to me in 4.5 seconds
--slightly less then 5 seconds, assuming the download of the whole
file takes ca. 0.5 seconds
end checkWebsite
Be aware that clicking the button twice would have your code execute
twice every 4.5 seconds, so maybe you should check the pendingMessages
somehwere. The docu on that property also shows on how to stop the
repeating.
On 7 May 2009, at 05:43, 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?
Thanks in Advance!
John Patten
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------------------------------
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