Uses the Python C-API to load a file called "my_sample_py_file.py" and runs its "my_sample_function" function

python_c_api_call.cpp

#include <iostream>
#include <filesystem>

#include <Windows.h>
#include <Python.h>

int main(int argc, char** argv) {

  Py_SetPythonHome(L"C:\\python36");
  Py_SetProgramName(L"my_test_program");

  Py_Initialize();

  if (!Py_IsInitialized()) {
    std::cout << "Error initializing Python" << std::endl;
    return -1;
  }

  wchar_t* py_argv[1] = { L"my_test_program" };
  PySys_SetArgv(1, py_argv);

  int ret = PyRun_SimpleString(
    "import os, sys \n"
    "sys.path.append(os.getcwd()) \n"
  );

  PyObject* py_module = PyImport_ImportModule("my_sample_py_file");
  if (!py_module) {
    std::cout << "Could not find \"my_sample_file.py\"" << std::endl;
    Py_Finalize();
    return -1;
  }

  PyObject* py_func = PyObject_GetAttrString(py_module, "my_sample_function");
  if (!py_func) {
    std::cout << "Could not find \"my_sample_function\"" << std::endl;
    Py_Finalize();
    return -1;
  }

  PyObject* py_return = PyObject_CallObject(py_func, NULL);

  // do some more processing in here; could go back to Python code during this time
  std::cout << "Sleeping for 10 seconds" << std::endl;
  Sleep(10E3);

  Py_Finalize();

  return 0;
}

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