How does a command find out who called it?

[Andre Garzia]

The way I implement such callbacks is by using a script local
variable. In my script local variable, I have a handler that registers
a callback. This handler will keep track of the target that registered
the callback. When I need to send a callback later, I pick the
original target from that variable.

I've edited the original code below:

The stack script says:
on openCard
 start using "minihttp.livecode"
end openCard

The card script says:

on someHandler ...
 httpGet "http://blah.com","myCallback"
end someHandler

on myCallback ...
 -- do someting brilliant with the data we've requested
end myCallback


Finally, I have a stack called "minihttp.livecode".
The stack script looks like:

local sCallbackA

on httpGet pUrl,pCallback
 -- save the callback
put the target into sCallbackA["target"]
put pCallback into sCallbackA["message"]

 -- kick off asynchronous httpGet operations with a local callback
 mysocketOpen "address","mySocketCallback"
 -- now return
end httpGet

on mySocketCallback args
 -- Yay! Finally have the data.  Hand it back
 send sCallbackA["message"] to sCallbackA["target"] in 0 milliseconds
end mySocketCallback