Hi,
I'm working on my first ARC-enabled app, but am having a problem with
how to keep my delegate's member data alive.
At startup (in the delegate's applicationDidFinishLaunching: function),
my delegate initializes a data object (a member of the delegate) containing
some NSString members. Those strings are populated via a call to a helper
class that is also a member of the delegate. That helper class call initiates
an asynchronous set of actions (HTTP), then returns immediately back to the
delegate. After returning from that call, the delegate's
applicationDidFinishLaunching: function simply drops out the bottom.
When the helper class finishes populating the data from the
asynchronous HTTP call, it responds with a callback into the delegate. The
delegate's callback function responds by showing the main window and populating
some text fields and buttons according to the strings in the data object. The
callback function then drops out the bottom. The dialog shows the correct
information, meaning that at THAT point in time, the data object was still
valid.
My problem comes later, when the user clicks on one of the buttons,
which calls an action in the delegate. At this point, I try to extract one of
the strings from the data object (to launch a browser with the given URL
string), and it gives me an access violation. Apparently, my data object has
been deleted. That is strange, since it is a member of the delegate.
I was under the impression that my design was correct, in that member
objects of the delegate should be initialized in the
applicationDidFinishLoading: function, right? So why does the object get
deleted while my delegate still exists? More importantly, how do I keep that
member data object alive so that my delegate's actions can access it?
Thanks,
Howard
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