Interprocess communication in C ++

Please help, how can I organize the exchange of process data (on Windows, if that matters)?

I have process1.exeone that calls process2.exewith several command line arguments. I want to track the "progress" process2from process1(let's say some value int). It (value int) can be accessed process1continuously or every X ms - it does not matter.

Any solution will be useful: WinApi or Qt.

Thanks everyone! All answers are very helpful! :) Thank you very much!