Combine python (gui) and C++

I have a program that works with files, everything is ready except for the interface, I could easily finish it in C++, but the time is running out. Is it possible to make an interface in Python, and functions in C++? Well, somehow from Python to call them?

Author: Victor VosMottor, 2020-11-02
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1 answers

Let's say you have a simple example of a C ++ class that you want to call from python, in a file named foo.cpp:

#include <iostream>

class Foo{
    public:
        void bar(){
            std::cout << "Hello" << std::endl;
        }
};

Since ctypes can only interact with C functions, you need to provide those that declare them as extern "C":

extern "C" {
    Foo* Foo_new(){ return new Foo(); }
    void Foo_bar(Foo* foo){ foo->bar(); }
}

Now compile this into a library:

g++ -c -fPIC foo.cpp -o foo.o
g++ -shared -Wl,-soname,libfoo.so -o libfoo.so  foo.o

And finally, you need to write your shell(for example, in fooWrapper.py):

from ctypes import cdll
lib = cdll.LoadLibrary('./libfoo.so')

class Foo(object):
    def __init__(self):
        self.obj = lib.Foo_new()

    def bar(self):
        lib.Foo_bar(self.obj)

Now everything works ;)

f = Foo()
f.bar() # and you will see "Hello" on the screen

source

 5
Author: Victor VosMottor, 2020-11-02 10:45:28