[Lazarus] How to copy specific region of desktop?

[Bo Berglund]

I wonder if there is a (preferably cross-platform) method to:

1) Select a region of the current desktop by placing a rectangle over it with
the mouse.

2) Copy the part of the desktop within the rectangle as an image to the
clipboard.

If so what functions do I need to accomplish the selection and the copy?

I am using Lazarus 2.0.10 and Fpc 3.2.0 on Windows 10 and Ubuntu 18.04.5


-- 
Bo Berglund
Developer in Sweden