Re: [Rubycocoa-talk] Objective-C Ubiquity?

[Jonathan P. <jp...@dc...>]

>
>
> the rb_main.rb file contains
>
>     if $0 == __FILE__ then
>       rb_main_init
>       OSX.NSApplicationMain(0, nil)
>     end
>
> if it instead had
>
>     if $0 == __FILE__ then
>       rb_main_init
>       app = OSX.NSApplicationMain(0, nil)
>     end
>
> would that work? I tried that, but it appears that "app" was too  
> local, and vanished before I could access it. But it's quite  
> possible I just don't have a good enough grasp of variable scope to  
> have figured out how to set that up correctly.

That won't work. NSApplicationMain doesn't return until the  
application exits - it handles running the main event loop of the  
application.

If you look at the documentation for the NSApplicationMain function,  
you'll see that it returns an int (not an NSApplication*):

    NSApplicationMain
    Called by the main function to create and run the application.

    int NSApplicationMain(int argc, const char *argv[])
> "sharedApplication only performs the initialization once; if you  
> invoke it more than once, it simply returns the NSApplication  
> object it created previously."

This is a common idiom in Cocoa. There are lots of class-level  
sharedBlah methods that return a singleton.