I tried adding a Python3 module in C

I tried to make a program written in C usable from Python 3 All the references are old and I had a hard time making it compatible with Python3 ...

First of all, the source code

`hello.c`


int add(int x, int y)
{
	return x + y;
}

void out(const char* adrs, const char* name)
{
	printf("Hello, I%s%s.\n", adrs, name);
}

This is the C source code, which has two functions, add and out.

`helloWrapper.c`


#include "Python.h"
extern int add(int, int);
extern void out(const char*, const char*);

PyObject* hello_add(PyObject* self, PyObject* args)
{
	int x, y, g;

	if (!PyArg_ParseTuple(args, "ii", &x, &y))
		return NULL;
	g = add(x, y);
	return Py_BuildValue("i", g);
}

PyObject* hello_out(PyObject* self, PyObject* args, PyObject* kw)
{
	const char* adrs = NULL;
	const char* name = NULL;
	static char* argnames[] = {"adrs", "name", NULL};

	if (!PyArg_ParseTupleAndKeywords(args, kw, "|ss",
			argnames, &adrs, &name))
		return NULL;
	out(adrs, name);
	return Py_BuildValue("");
}

static PyMethodDef hellomethods[] = {
	{"add", hello_add, METH_VARARGS},
	{"out", hello_out, METH_VARARGS | METH_KEYWORDS},
	{NULL}
};

static struct PyModuleDef hellomodule =
{
    PyModuleDef_HEAD_INIT,
    "hellomodule", /* name of module */
    "",            /* module documentation, may be NULL */
    -1,            /* size of per-interpreter state of the module, or -1 if the module keeps state in global variables. */
    hellomethods
};

PyMODINIT_FUNC PyInit_hellomodule(void)
{
    return PyModule_Create(&hellomodule);
}

This is the main source code.

See here for the meaning of each program → Call a C program from Python

Try to run

compile

Execute three commands.

gcc -fpic -o hello.o -c hello.c
gcc -fpic -I`python3-config --prefix`/Headers -o helloWrapper.o -c helloWrapper.c
gcc -L`python3-config --prefix`/lib -lpython3.5 -shared hello.o helloWrapper.o -o hellomodule.so

First, compile hello.c to create an object file
Use -I to specify the header file in python3-config--prefix and compile helloWrapper.c.
And finally, specify the location of the library in python3-config--prefix with -L to create the library.

Try from python3

Let's try it out, is it really done?

hnkz $ python3
Python 3.5.2 (v3.5.2:4def2a2901a5, Jun 26 2016, 10:47:25)
[GCC 4.2.1 (Apple Inc. build 5666) (dot 3)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import hellomodule
>>> hellomodule.add(2,3)
5
>>> hellomodule.out("hamamatsu","hnkz")
Hello, I am hnkz of hamamatsu.

It's done! Wow! !!

I want to apply it and make a keylogger with Python3.

References

Call a C program from Python I tried C binding in Python Compiler can't find Py_InitModule() .. is it deprecated and if so what should I use?