From: Brandon
If you can figure out where they grab these links from:
http://www.runescape.com/player_count.js?varname=iPlayerCount&callback=jQuery17206104712865781039_1347331747111&_=1347331787918
or how they're generated then sure you can grab player ID's.
Also note that the part that says: 1347331747111
That increases by 1 every-time the player count changes. Thus if you can find the base value and just keep checking for 404 errors every time you add 1.. Bam player count successful if there are none. Else you need to wait until it updates again and check.
Periodic checks are the only way.
Sorry I didn't understand half of this post, so let me just ask this:
If I did getpage on that link and logged the number between the parentheses every 5 minutes, let's say, that would give me accurate data right? The link will work forever right?
E: Yep, I can just do getpage on the link, and then use between to get the number of players online. If this link works forever, I'm set. I'm trying to make graphs of the amount of people online daily to find optimal times to bot, merch etc.
E': Alright I'm logging data right now, I'll see how that turns out :D