I believe the reason is because your sleep 1 prevented a non-
deterministic garbage collection cycle. In the presence of a Cocoa run
loop the GC might be triggered by a few different ways. I believe
you're just lucky that it works :)
Laurent
On Jan 6, 2010, at 10:03 PM, Michael Johnston wrote:
I figured that was the case, and that is why I switched to using an
instance variable which will stick around after
applicationDidFinishLaunching finishes, but I'm still puzzled by
why the local variable does not get if I add a "sleep 1". IE, in my
original snippet, leaving status_item as a local, which should go
out of scope when applicationDidFinishLaunching finishes, if I put
a "sleep 1" at the end of applicationDidFinishLaunching, the status
item never disappears (or at least it hasn't after much more than 1
second)
Cheerio,
Michael Johnston
lastobe...@mac.com
On 6-Jan-10, at 9:24 PM, Laurent Sansonetti wrote:
Hi Michael,
I did not give your snippet a try, but looking quickly at the
documentation for -[NSStatusBar statusItemWithLength:] I saw:
"The receiver does not retain a reference to the status item, so
you need to retain it. Otherwise, the object is removed from the
status bar when it is deallocated."
It's probably what's causing the problem here. Your status item
reference is not retained in the program, so it's promoted for
garbage collection. Try keeping a reference to it (for example
using an instance variable instead of a local variable) :)
HTH,
Laurent
On Jan 5, 2010, at 1:30 AM, Michael Johnston wrote:
I just purchased the book Programming Cocoa with Ruby, and am
working through the examples using Macruby.
This tiny app works fine in rubycocoa, but in macruby the created
statusbar item immediately disappears.
{{{
#!/usr/bin/env macruby
framework 'cocoa'
class App
def applicationDidFinishLaunching(aNotification)
statusbar = NSStatusBar.systemStatusBar
status_item = statusbar.statusItemWithLength
(NSVariableStatusItemLength)
image = NSImage.alloc.initWithContentsOfFile("stretch.tiff")
raise "Icon file 'stretch.tiff' is missing." unless image
status_item.setImage(image)
end
end
NSApplication.sharedApplication
NSApp.delegate = App.new
NSApp.run
}}}
I assumed this had to do with garbage collection because in obj C
status_item would have to be retained, and so I changed
"status_item" to "@status_item" and then it works fine.
However while playing around with it I also noticed that if I
leave status_item as a local var and add a "sleep 1" at the end of
applicationDidFinishLaunching, it also works fine and the status
item never disappears.
So now I'm not sure whether there is a bug or not. In general,
what is the intended behaviour of Macruby with local variables
referring to objects that would have to be retained in obj C when
said variables go out of scope?
Cheerio,
Michael Johnston
lastobe...@mac.com
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