Re: Receiving system notifications in 10.8
Re: Receiving system notifications in 10.8
- Subject: Re: Receiving system notifications in 10.8
- From: Jens Alfke <email@hidden>
- Date: Fri, 11 Oct 2013 09:36:31 -0700
On Oct 10, 2013, at 9:40 PM, Carl Hoefs <email@hidden> wrote:
> Lots of applications come to mind, if such a mechanism were available. To be able to know when a certain song is playing in iTunes Radio and crank up the volume,
There is (or used to be) an NSDistributedNotification that iTunes posts whenever the currently playing track changes. I don’t know if it’s documented anywhere, but you can discover what it is by writing a tiny app that adds an observer for all distributed notifications of any time and logs them.
> or to send out a text/email/tweet when certain notifications are posted, etc. I would think this would be Generally Useful. Wish there were a way…
It could be useful. But it would be a very different facility, since the data posted in the notification would need to be machine-readable not human-readable — instead of a localized string you’d want something like an NSDictionary with well-defined keys. (The types of notifications sent out would likely be different too. For example, there’s no point displaying a visible notification when Mail sends a message, but an internal notification would be useful.)
Anyway, this facility already exists — it’s NSDistributedNotification. What you’re asking for is basically for more apps to support posting them, which isn’t a technical issue so much as one of evangelism.
—Jens
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