如何从 Windows 上的 C++ 程序在虚拟环境中启动 python 脚本？

Question

So far I am using a 2-step approach and launch cmd.exe rather than python.exe . But I don't like cmd.exe in between the process tree for several reasons (eg I don't receive the python process handle or ID, but rather the one of cmd.exe ).

string sCmd =
  "cmd.exe /C venv\\SomeEnv\\Scripts\\activate.bat && python.exe Subprograms\\my_script.py";
CreateProcessA(nullptr,
  sCmd.data(),
  ...);

I believe that to activate the virtual environment I need to put it at the beginning of the PATH environment variable and set some other variables like PYTHONHOME and PYTHONPATH , but I'm not sure whether this is sufficient and what values to set there on Windows.

Answer 1

If you want to do it using standard C++, you can go for std::system()

std::system("command_to_run_with_space_separated_params_if_any");

If you want to use windows ways, you can go for followings...
  ShellExecuteEx()
  ShellExecute()
  CreateProcessA()
  CreateProcessW()