Python multiprocessing: How can I RELIABLY redirect stdout from a child process?

Question

NB. I have seen Log output of multiprocessing.Process - unfortunately, it doesn\'t answer this question.

I am creating a child process (on windows) via multiprocessi

Answer 1

I don't think you have a better option than redirecting a subprocess to a file as you mentioned in your comment.

The way consoles stdin/out/err work in windows is each process when it's born has its std handles defined. You can change them with SetStdHandle. When you modify python's sys.stdout you only modify where python prints out stuff, not where other DLL's are printing stuff. Part of the CRT in your DLL is using GetStdHandle to find out where to print out to. If you want, you can do whatever piping you want in windows API in your DLL or in your python script with pywin32. Though I do think it'll be simpler with subprocess.