FYI, the alloc.init pattern is correct in MacRuby too. As in pure Objective-C, calling +new in MacRuby is a shortcut for +alloc and -init. Doing +new then -initWithContentsOfFile will result in initializing the object twice, probably not what you want. Laurent On Jan 5, 2010, at 1:52 AM, Michael Johnston wrote:
Note that I'm aware {{{ image = NSImage.alloc.initWithContentsOfFile ("stretch.tiff") }}} should be {{{ image = NSImage.new.initWithContentsOfFile("stretch.tiff") }}}, I just forgot to change back one of my experiments. It doesn't affect anything in this example though.
Cheerio,
Michael Johnston lastobelus@mac.com
On 5-Jan-10, 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 lastobelus@mac.com
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