Error of python file with 'import Orange' during calling from a cpp file

[beambious]

I'm calling a python file from a cpp file for data mining model library.
When I import 'Orange' in the python file for my trained orange model operation, an error occurs. (there is no message). About this, I experienced two strange situation (Case 1, Case 2).

1. What's wrong?
   Case 1) An error occurs when a python file(import Orange) calling from a cpp file(include Python.h) is run.
   If there is no 'import Orange' in the python file, the cpp and python file are run well.

   Case 2) When the python file(import Orange) is running independently, the python file is run well.

2. Question
   Is it impossible to import 'Orange' in a python file when I call it from a cpp file?

3. What's your environment?

• Operating system: Windows 10, Anaconda
• Orange version: 3.38.1
• How you installed Orange: 1) Conda install orange3, 2) Orange3-3.38.1-Miniforge-x86_64.exe

[janezd]

I don't believe this is Orange's fault.

It is difficult to say anything without seeing any error messages, but my guess would be that some files are not found due to misconfigured paths/environments. Either Orange as whole (is it in Python's import path? Check the content of Python's sys.path when you run it from C) or some of the files that Orange tries to import. In particular, I'd check whether it finds the Cython files, e.g. Orange/data/variable*.pyx, whose names include Python version and OS.

[beambious]

I added my environmental conditions
It's very simple, and I didn't find a misconfiguration.
_variable.cp312-win_amd64.pyd is located at C:\ProgramData\anaconda3\Lib\site-packages\Orange\data
I want to know how to check whether it finds the Cython files.

1. Python part (Model function)
   (1) Python code
   import numpy as np
   import pickle
   import sys

   #from Orange.data import Table

   def start_process():
   print("Hello, world!")
   print(sys.path)
   print(sys.version)
   a = np.array([1, 2, 3])
   print(a)

   (2) Python results without orange import by calling from cpp file (It's same result with python only operation)
   (base) C:\Cppwithpythonfun\x64\Release>Cppwithpythonfun
   Hello, world!
   ['C:\ProgramData\anaconda3\include', 'C:\Cppwithpythonfun\x64\Release\python312.zip', 'C:\ProgramData\anaconda3\DLLs', 'C:\ProgramData\anaconda3\Lib', 'C:\Cppwithpythonfun\x64\Release', 'C:\ProgramData\anaconda3', 'C:\ProgramData\anaconda3\Lib\site-packages', 'C:\ProgramData\anaconda3\Lib\site-packages\win32', 'C:\ProgramData\anaconda3\Lib\site-packages\win32\lib', 'C:\ProgramData\anaconda3\Lib\site-packages\Pythonwin']
   3.12.7 | packaged by Anaconda, Inc. | (main, Oct 4 2024, 13:17:27) [MSC v.1929 64 bit (AMD64)]
   [1 2 3]

   (3) Python results with orange import
   (nothing)

2. Cpp part (Python function calling)#include "cppwithpythonfun.h"
   int main(void)
   {
   _putenv("PYTHONHOME=C:/ProgramData/anaconda3");
   _putenv("PYTHONPATH=C:/ProgramData/anaconda3/include");
   _putenv("PYTHONPATH=C:/Program Files/Orange/include");
   _putenv("PYTHONPATH=C:/ProgramData/anaconda3/Lib/site-packages/Orange/data"); // _variable.cp312-win_amd64.pyd location
   PyObject* pName, * pModule, * pFunc, * pValue;
   Py_Initialize();
   pName = PyUnicode_FromString("Cppwithpythonfun");
   pModule = PyImport_Import(pName);
   pFunc = PyObject_GetAttrString(pModule, "start_process");
   pValue = PyObject_CallObject(pFunc, NULL);
   Py_Finalize();
   return 0;
   }

[janezd]

OK, I'll try, but don't count on me (or any other member of the team) to do the debugging of your code for you. :)

The next thing I'd try is enclosing from Orange.data import Table into try-except and print the exception.

[ales-erjavec]

You can also try setting PYTHONVERBOSE=1 env variable. This should print out (lots of) diagnostic/debug info from python import machinery.

[janezd]

Closed due to inactivity.