Here's an interesting one.
Using the XML parser Xtra and I discovered that when using the callback
feature of parseURL, script errors are just ignored. The offending code
just exits.
Not getting error messages is A Bad Thing when debugging, as I am sure
you will appreciate. I spent enough time hunting this issue that I have
decided to post about it.
Bare bones circumstances are demonstrated with this behavior:
property xmlparser
on beginsprite me
thisURL = "http://www.w3schools.com/xml/note.xml";
xmlparser = new(xtra "xmlparser")
xmlparser.parseURL(thisURL, #parseDone, me)
end
on parseDone me, l
err = xmlparser.getError()
if voidP (err) or err = "" then -- parse successful?
l = xmlparser.makelist()
put l[0] -- deliberate error (index out of range)
alert "This never happens"
end if
end
If parseDone() calls some other handlers, this error can be even more
difficult to track. The worst thing about this is that *any* script
errors are ignored, regardless of kind, so this issue may rear its ugly
head under many circumstances.
I suppose some of you know this already, but I post it here so that it
might be of use sometime, somewhere.
I long for a proper exception handling mechanism in Lingo.
Brennan
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