Apple has NSStatusItem to manage the status bar item. But it does not have API to show a balloon message from the status bar.
I know Java has TrayIcon.displayMessage()
.
Does anyone know how to implement this balloon message with Xcode C/C++?
No, balloon-style messages are not part of the standard OS X UI. Many third-party tools use the Growl framework for similar functionality.
This might be what your looking for: http://mattgemmell.com/2008/03/04/using-maattachedwindow-with-an-nsstatusitem
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