Can't launch Windows bat files

PaoloFazio · 18 March 2025 10:50

Hi community.

I’m currently using bat files to launch Maya and other applications on Windows, but creation flags at:

client/ayon_applications/manager.py

e59792b8d


      
              key: str(value)
              for key, value in src_env.items()
              if key not in ignored_env
          }
          # subprocess.Popen keyword arguments
          self.kwargs = {"env": env}
          
          if platform.system().lower() == "windows":
              # Detach new process from currently running process on Windows
              flags = (
                  subprocess.CREATE_NEW_PROCESS_GROUP
                  | subprocess.DETACHED_PROCESS
              )
              self.kwargs["creationflags"] = flags
          
          if not sys.stdout:
              self.kwargs["stdout"] = subprocess.DEVNULL
              self.kwargs["stderr"] = subprocess.DEVNULL
          
          self.prelaunch_hooks = None
          self.postlaunch_hooks = None

are preventing executables from being launched.

My temp solution is replacing those flags with ‘subprocess.CREATE_NEW_CONSOLE’.

I can only use a bat because it’s not just settings env vars,
but also copying some files from the network to local machines.

I’ve just seen that the terminal pre launch hook is doing the same:

github.com/ynput/ayon-applications

client/ayon_applications/hooks/prelaunch_shell_windows.py

e59792b8d


      
          app_groups = {"terminal"}
          platforms = {"windows"}
          launch_types = {LaunchTypes.local}
          
          def execute(self):
              # Change `creationflags` to CREATE_NEW_CONSOLE
              # - on Windows some apps will create new window using its console
              # Set `stdout` and `stderr` to None so new created console does not
              #   have redirected output to DEVNULL in build
              self.launch_context.kwargs.update({
                  "creationflags": subprocess.CREATE_NEW_CONSOLE,
                  "stdout": None,
                  "stderr": None
              })

so, are there any cases when current flags should be used instead of ‘subprocess.CREATE_NEW_CONSOLE’?

Thanks guys,
you rock.