My quest today began with a seemingly simple question:
If I have a button that gets data from a URL via libURL, how do I
prevent a second request if the user double-clicks?
In this case we have too many entry points to disable and re-enable the
controls that trigger URL access for that to be a practical option.
Besides, occasionally libURL neither completes a URL request nor
provides an error for it, so relying on disabling a control risks
getting into a state where the control is disabled with no way to know
to re-enable it.
In brief, sometimes GET or POST with libURL returns with no data in
either "it" or "the result".
And looking through the forum and list archives, it seems I'm far from
alone in this experience.
Then today I was working on this code in v8.1, when I encountered this
new error message:
tsneterr: Sync request already in progress
Hmmm...so now we need to rewrite the error handling for our URL code to
account for new strings? Good to know.
So....
Does anyone here have a handler which reliably accesses a URL while
preventing re-entrant attempts until the first one completes?
The example Dave Cragg offers on his web site is:
global gUrlBlocking
on mouseUp
put "http://www.xxxxxx.com/images/mykids1.jpg"; into tUrl
if gUrlBlocking is true then
beep
else
put true into gUrlBlocking
get url tUrl
put false into gUrlBlocking
if the result is empty then
put it into image 1
else
answer the result
end if
end if
end mouseUp
http://www.lacscentre.com/liburl/liburldoc.html#post
...but in practice I find libURL occasionally doesn't complete a
request, nor provides any way of letting me know that, so gUrlBlocking
never get cleared.
Who among us mortals has found a way to adequately handle error-checking
in libURL with reliable consistency?
I imagine I'm missing something simple here. Hoping that's the case,
anyway.
Fingers crossed....looking forward to any reasonable tips for reliable
URL access....
--
Richard Gaskin
Fourth World Systems
Software Design and Development for the Desktop, Mobile, and the Web
____________________________________________________________________
ambassa...@fourthworld.com http://www.FourthWorld.com
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![http://www.xxxxxx.com/images/mykids1.jpg"](http://www.xxxxxx.com/images/mykids1.jpg"){kind=link}