Is there a way to monitor active window screen values?

[raskun]

So I have a game that I want to make a hotkey for. What I want to achieve is checking the HP/SP value like for example I have an HP of 100/2500
Then AHK will get that data so I can make a calculation whether I will use a macro for autopots or not. I have tried of getting pixel color for the hp bar, it works, but I want a different approach since opening that hp bar window is covering large part of the game window.

I have read about this :
https://autohotkey.com/boards/viewtopic.php?t=18677
and this:
http://capture2text.sourceforge.net/

But is there a way to constantly monitor the text every .5 milliseconds and with just giving the coordinates of the screen and not dragging the most to the specific part of the screen?