How to pass string arguments in Python function via C++

Question

Image shows the output. I am expecting "Hai" to be printed. But its printing some numberHow to pass string argument to python function via c++

I tried below code. It can pass double, float, int , bool values. But when it pass string value its printed as numbers which seems to be a memory location Python.py is my script file name

class Adder: # Constructor def __init__(self): self.sum = 0 def disp(self, param1): print("Parameter is: ", param1)

void ExecutePyMethodeWitStringArg() { PyObject *pName, *pModule, *pDict, *pClass, *pInstance; // Initialize the Python interpreter Py_Initialize(); // Build the name object pName = PyUnicode_FromString("Python"); // Load the module object pModule = PyImport_Import(pName); // pDict is a borrowed reference pDict = PyModule_GetDict(pModule); // Build the name of a callable class pClass = PyDict_GetItemString(pDict, "Adder"); // Create an instance of the class if (PyCallable_Check(pClass)) { pInstance = PyObject_CallObject(pClass, NULL); PyObject_CallMethod(pInstance, "disp", "(i)", "Hai"); } else { std::cout << "Cannot instantiate the Python class" << std::endl; } std::getchar(); Py_Finalize(); }

What are you doing? What is your C++ minimal reproducible example? Please refresh how to ask good questions, as well as this question checklist. — Some programmer dude
– Some programmer dude, Commented Nov 5, 2019 at 9:24
Above is the code. I just want to pass a string to python function. — Hari Sankar v m
– Hari Sankar v m, Commented Nov 5, 2019 at 9:27

Some programmer dude · Accepted Answer · 2019-11-05 09:33:45Z

The problem is a mismatching format specifier and argument type:

 PyObject_CallMethod(pInstance, "disp", "(i)", "Hai");

According to the Py_BuildValue documentation the format "(i)" would be for a tuple of integers, not a string.

You need to use "s" for the format for a null-terminated C string.

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