How Can I Integrate Python Methods into C/C and Retrieve Their Return Values?

Integrating Python Methods into C/C Programs and Retrieving Return Values

This question focuses on invoking custom Python functions within C code and capturing their return values. The given example utilizes PyRun_SimpleString to call a function, but this approach has limitations.

To effectively integrate Python methods into C, it's crucial to utilize the methods provided by the C-API. Here's a step-by-step guide:

1. Import Python Module: Begin by importing the target Python module with PyString_FromString and PyImport_Import.

PyObject* myModuleString = PyString_FromString((char*)"mytest");
PyObject* myModule = PyImport_Import(myModuleString);

2. Acquire Function Reference: Identify the desired function within the module using PyObject_GetAttrString.

PyObject* myFunction = PyObject_GetAttrString(myModule,(char*)"myabs");

3. Create Function Arguments: Prepare any necessary arguments as a tuple using PyTuple_Pack. For example, to pass a double, use PyFloat_FromDouble.

PyObject* args = PyTuple_Pack(1,PyFloat_FromDouble(2.0));

4. Invoke Function and Get Result: Execute the function with PyObject_CallObject and store the result in an PyObject pointer.

PyObject* myResult = PyObject_CallObject(myFunction, args)

5. Convert Result to Native C Type: Finally, convert the result to the desired native C type using the appropriate conversion function.

double result = PyFloat_AsDouble(myResult);

Remember to handle errors appropriately by checking the return values of the C-API functions. By following these steps, you can effectively call Python methods from C/C and retrieve their return values seamlessly.

The above is the detailed content of How Can I Integrate Python Methods into C/C and Retrieve Their Return Values?. For more information, please follow other related articles on the PHP Chinese website!