Programmatically wake display on OSX

Question

I've managed to get the display to sleep immediately with

pmset displaysleepnow

in terminal, however for waking the display I've only found

pmset schedule wake "12/24/2009 00:00:00" 

which fails to work if I try to schedule anything earlier than at least 10secs from now.

Is there any way to programmatically wake the display in Cocoa? Someone has suggested IOPMAssertionDeclareUserActivity but I couldn't find any examples on this so I am struggling.

I am using Swift by the way, but Objective C code is also welcome.

Breach

Perhaps try exploiting the "wake on network activity" feature. I think it's more commonly known as "Wake on LAN". – Doxy

what exactly are you trying to wake the display programmatically for? I dont see a point in waking a display when a user isn't present. – Oozy

Try this? The first answer seems relevant. – Artisan

Possible duplicate of How do I wake from display sleep in OSX 10.7.4? – Objectivity

Answer 1

Got it working with:

  IOPMAssertionID assertionID; 
  IOPMAssertionDeclareUserActivity(CFSTR(""), kIOPMUserActiveLocal, &assertionID);

Breach

You should accept your own answer so people can easily find the solution. – Crotty

This code was working fine till OSX 10.10 but does not seem to work on OSX El Capitan. Do we have an alternative? – Personal

I didn't know, haven't upgraded yet. Please post a solution here if you find one – Breach

Answer 2

Here is the answer in Swift 3.x:

var assertionID : IOPMAssertionID = 0
 _ = IOPMAssertionDeclareUserActivity("" as CFString, kIOPMUserActiveLocal, &assertionID)

Untwist

thanks, - but for anyone else who's trying this - took me half an hour to discover you find the import you need (which is IOKit.pwr_mgt) to get the above function – Bruiser