Question

is it possible to get the handle of a specific component in an unknown number of window opened by the same program?
The program foo.exe contains a button that, when clicked, opens a form containing a Label and an Image ( with no upper bound on the number of forms opened). Is possible to get all the handle of the Label component of every window openend, given the process name “foo” ?

Answer 1

with EnumWindows or FindWindow you can find the application window depending if you already know the title or the process name or so on, you can even use FindWindowLike if you really do not much of it.

Once in one way or another you know the windows handle of your window, with GetDlgItem you can get info about your child controls.