# hs.distributednotifications

Interact with NSDistributedNotificationCenter There are many notifications posted by parts of OS X, and third party apps, which may be interesting to react to using this module.

You can discover the notifications that are being posted on your system with some code like this:

foo = hs.distributednotifications.new(function(name, object, userInfo) print(string.format("name: %s\nobject: %s\nuserInfo: %s\n", name, object, hs.inspect(userInfo))) end)
foo:start()

Note that distributed notifications are expensive - they involve lots of IPC. Also note that they are not guaranteed to be delivered, particularly if the system is very busy.

# API Overview

Functions - API calls offered directly by the extension

post

Constructors - API calls which return an object, typically one that offers API methods

Methods - API calls which can only be made on an object returned by a constructor

start
stop

# API Documentation

# Functions

# post


Signature	`hs.distributednotifications.post(name[, sender[, userInfo]])`
Type	Function
Description	Sends a distributed notification
Parameters	name - A string containing the name of the notification sender - An optional string containing the name of the sender of the notification (in the form `com.domain.application.foo`). Defaults to nil. userInfo - An optional table containing additional information to post with the notification. Defaults to nil.
Returns	None
Notes	None
Examples	None
Source	extensions/distributednotifications/libdistributednotifications.m line 81

# Constructors

# new


Signature	`hs.distributednotifications.new(callback[, name[, object]]) -> object`
Type	Constructor
Description	Creates a new NSDistributedNotificationCenter watcher
Parameters	callback - A function to be called when a matching notification arrives. The function should accept one argument:
notificationName - A string containing the name of the notification name - An optional string containing the name of notifications to watch for. A value of `nil` will cause all notifications to be watched on macOS versions earlier than Catalina. Defaults to `nil`. object - An optional string containing the name of sending objects to watch for. A value of `nil` will cause all sending objects to be watched. Defaults to `nil`.
Returns	An `hs.distributednotifications` object
Notes	On Catalina and above, it is no longer possible to observe all notifications - the `name` parameter is effectively now required. See https://mjtsai.com/blog/2019/10/04/nsdistributednotificationcenter-no-longer-supports-nil-names
Examples	None
Source	extensions/distributednotifications/libdistributednotifications.m line 40

# Methods

# start


Signature	`hs.distributednotifications:start() -> object`
Type	Method
Description	Starts a NSDistributedNotificationCenter watcher
Parameters	None
Returns	The `hs.distributednotifications` object
Notes	None
Examples	None
Source	extensions/distributednotifications/libdistributednotifications.m line 119

# stop


Signature	`hs.distributednotifications:stop() -> object`
Type	Method
Description	Stops a NSDistributedNotificationCenter watcher
Parameters	None
Returns	The `hs.distributednotifications` object
Notes	None
Examples	None
Source	extensions/distributednotifications/libdistributednotifications.m line 142