How to write a program to work with someone else's window?

Question

Java

I need to write a program that would work with the window of another program.
Or rather, I filled in certain fields in it and clicked on the buttons.
What to read?
What can be used to find out the identifiers of fields and buttons in programs?

Answer 1

https://www.autoitscript.com/site/
It seems to be what you want.

Answer 2

if you plan to fill it with sending events to UI elements as windows, which they actually are, then the standard VS Spy ++ utility will go, but this approach is only suitable for 1 specific program and development will be non-trivial.
You can get by with a clicker that will poke in the right places and copy-paste the desired text.
There is a utility that was created to fill in "registration data" according to the registry, most likely it will be easier to use here.

Answer 3

I wrote a similar program in C# using wrappers for the system libraries from www.pinvoke.net/index.aspx, which I placed in static classes. The program was a bot for a 3d game client.

Answer 4

Read about WinApi. As well as books from the series "Programming in / C ++, C #, Delphi / through the eyes of a hacker"