Dar Scott wrote:
On Jul 11, 2005, at 4:08 PM, Alex Tweedly wrote:
I want to build a library where some of the functions in it have
parameters which are callbacks;
agtMyFunction pData, pCallBackMessage
You can pass 'the long id of me' as an extra parameter.
Ick.
If that is empty, you can use 'the target'. That will work 95% of the
time and is annoying the other 5%. I think libURL uses that.
Ugh.
You can create a "callback value" that you pass, that includes the
handler name and the object long id.
Oh if only we had macros :-) (I'm joking ...but they would actually
help in this case)
Often, you want to call a handler of a specific name and you need only
pass the long id of the object.
I guess I'll use a wrapper around executionContexts.
You can vote for the enhancement in bugzilla to add a function to get
this: #1954. Hmmm. My search came up with 1243 and 2839, too.
Dups, maybe.
I prefer to use the "original" (i.e. lowest numbered) out of a set of
dups - but 1243 has already been rejected as "not a bug", so I'll leave
it alone, and instead I added my votes to #1954. I wish there was a way
to get the votes on 1243 and 2839 moved over to 1954, so there was a
more accurate count.
Your can write your own function to get the object of the caller using
the executionContexts property. The property is not supported, so I'd
encourage the wrapper incase it changes.
will do - thanks.
Dave Cragg wrote:
The target will probably work if (using your card script example) the
target object calls the card script handler using the normal message
hierachy. So if the callback is sent from the library to the target,
and there is no handler in the target, it will pass to the card.
Hmmm - but there could be a handler in the target object with the same
name - and much mayhem would ensue.
(Thanks Mark and Trevor also). I dislike having an extra parameter, so
I'm going to go with executionContexts inside a wrapper - maybe I'll
call it revCallerID and hope I get lucky in the future :-)
Actually, I'd really like to have the syntax of "socket" functions
extended to user-defined functions
callMyHandler value with message <callback>
I really like Transcipt's neo-English style - just wish it could be used
for user-defined handlers like it can for built in ones.
--
Alex Tweedly http://www.tweedly.net
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