How to Extract Return Values from Python Methods Called via C/C ?

Extracting Return Values from Python Methods Called from C/C

When calling a custom Python function from C, one may wish to retrieve the return value for further processing in C. This can be achieved by leveraging the methods provided by the CPython API.

Begin by importing the Python module using PyImport_Import():

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

Next, obtain a reference to the function using PyObject_GetAttrString():

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

Create arguments for the function and call it using PyObject_CallObject():

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

Finally, retrieve the C double result:

double result = PyFloat_AsDouble(myResult);

Note that error handling is crucial and should be implemented to account for potential errors during these operations.

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