I came across the need to be able to find something on the screen based on a reference image in my AutoIt scripts. However, this is not an available feature of AutoIt. There are functions available for checking individual pixels, but not images.

I found a solution in this thread. The key is the AutoHotkey ImageSearch function. Someone extracted the ImageSearch code from AutoHotkey, packed it up in to convenient DLLs, and put together a UDF ¹⁾ library that acts as a wrapper.

I took the UDF library and made the following improvements to it:

• Updated relevant functions to return an array of [x,y] coordinates on success, and False on failure. Original search functions returned True/False success status, while coordinate results were stored in external variables passed in by reference.
• Updated relevant functions with an extra parameter for a window handle, making it possible to limit the search area to the boundaries of a specified window.
• Added the ability to handle multi-monitor desktops by re-defining desktop boundaries in to new Global variables $desktopLeft, $desktopTop, $desktopRight, $desktopBottom, $desktopWidth, and $desktopHeight.

I've put it up on GitHub.