Sending ^C to Python subprocess objects on Windows

Question

I have a test harness (written in Python) that needs to shut down the program under test (written in C) by sending it ^C. On Unix,

proc.send_sign         


        

Answer 1

Try calling the GenerateConsoleCtrlEvent function using ctypes. As you are creating a new process group, the process group ID should be the same as the pid. So, something like

import ctypes

ctypes.windll.kernel32.GenerateConsoleCtrlEvent(0, proc.pid) # 0 => Ctrl-C

should work.

Update: You're right, I missed that part of the detail. Here's a post which suggests a possible solution, though it's a bit kludgy. More details are in this answer.