How to notify of an error...

FROM : Tim Davis
DATE : Tue Nov 06 16:27:03 2007

Ok.  I'm sorry if this sounds like a dumb question.  Have only been 
doing Cocoa for about 3-4 months after switching from a Windows .NET 
environment, I don't know everything yet :)

I have a class that at some point reads a one line file and parses the 
data (No I can not change this, it's reading a file from a 3rd party 
app, not my own).  Well, if for some reason it encounters an error how 
do I notify the calling class?

For instance: My main window controller will be the one that creates 
this object, the object will then at some point load the file, if it 
encounters an error how does it relay that information to the window 
controller so I can display a proper error message?

I thought about just passing the window controller to the initWith 
section but to me that just seems like a waste of memory...

In .NET I would use events, but I am not sure in Cocoa?

Thanks
-Tim