[Unload SWF] appears in console and hangs app

Question

Occasionally, "[Unload SWF] path:main-debug.swf" appears and
kills any HTTPService calls that are made.
The app behaves as such:
1. About 4 HTTPService calls are made at once, using
different HTTPService instances.
2. Occasionally, in the debug console a "[Unload SWF]..."
appears, showing the path to my app. Sometimes it appears once for
every webservice call that I make.
3. Each webservice that gets the "[Unload SWF]" will never
return and hangs forever.
Sometimes, I'll also see a "[SWF] path:main-debug.swf"
message in the console, at which point the webservices will hang
again. If I click "Cancel" in my app, then try it again, they will
sometimes magically work (and I don't get those [Unload SWF]
messages).
Any help would be greatly appreciated!
-Michael Whitaker:confused;

Answer 1

Unbelievable...
I think I may have found the problem and solution:
The way I was using the HTTPService component was through a
seperate class which itself contained the httpservice that I was
instantiating and calling on a per-need basis. The function I was
using to call my web service needs accepted two function pointers
(or Function types) which were called on a ResultEvent or a
FaultEvent (from the HTTPService). I was using lamba functions
(inline functions) in the method call. That is what seemed to be
the problem. As soon as I moved the lamba functions outside ,into
real functions, and just passed their reference through my method,
everything worked.
I've noticed several problems with lamba functions, all of
which are very unfortunate (because I would use them more, but they
are so buggy):
1. A lamba function sometimes has some weird scope. At times
calling "this.something" fails from within the lamba function as
'this' is null. Ex:
class Bob
public Bob()
this.addEventListener(Event.ENTER_FRAME,
function(e:Event):void { trace("this: " + this.toString()); },
false, 0, true);
(Note: this is 1% psudo code (uncompiled).) "this" will
sometimes be null (depending on where the lamba is used).
2. If, using the above code, you were to instantiate several
Bobs at a time, and add them to the displaylist, sometimes only ONE
of the instances will actually call their lamba function on
enterframe; the others won't. I'm not sure why this happens, but I
think multiple instances of the same class using a lamba function
tends to conflict in memory or something. (or in the special
lamba-scope).
3. At times, as per my problem in this thread, a lamba
function won't even be called. I've solved this by pulling out the
lamba functions and placing them in real functions, then just
passing the pointer across.
I guess the debugger sending [Unload SWF] and [SWF] messages
were just a coincidence (unless they somehow affect lamba
functions). I'm going to continue testing this to verify that the
problem has gone away. If it hasn't, I'll probably start a new
thread.
Thanks for your help mike_morearty!