Python call CPlus

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Pybind11 Python C++

环境安装

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conda install pybind11 -c conda-forge

绑定一个c++的类

文件结构

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src/Person.cpp
    /Person.h
    /p_person.cpp  # pybind文件

Person.cpp

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//Persion.cpp
#include "Person.h"

Person::Person() {
    name = "";
    age = 0;
}

Person::Person(string name, int age) {
    this->name = name;
    this->age = age;
}

Person::~Person() {

}

string Person::say_hello() {
    return "hello, my name is " + this->name;
}

void Person::set_name(string name) {
    this->name = name;
}
void Person::set_age(int age) {
    this->age = age;
}

string Person::get_name() const {
    return this->name;
}

int Person::get_age() const {
    return this->age;
}

Person.h

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// Persion.h
#pragma once

#include <string>
using namespace std;

class Person {
    public:
        Person();
        Person(string name, int age);
        ~Person();

        void set_name(string name);
        void set_age(int age);
        string get_name() const;
        int get_age() const;

        string say_hello();


    private:
        string name;
        int age;

};

p_person.cpp

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#include <pybind11/pybind11.h>
#include <pybind11/stl.h>
#include "Person.h"

namespace py = pybind11;

PYBIND11_MODULE(person, m) 
{
    m.doc() = "Person module"; // optional module docstring

    py::class_<Person>(m, "Person")
        .def(py::init<>())
        .def("get_name", &Person::get_name)
        .def("set_name", &Person::set_name)
        .def("get_age", &Person::get_age)
        .def("set_age", &Person::set_age)
        // .def("get_gender", &Person::get_gender)
        // .def("set_gender", &Person::set_gender)
        .def("say_hello", &Person::say_hello);
}

CMakeList.txt

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# CMakeLists.txt
cmake_minimum_required(VERSION 3.10)

project(PythonCPPExample)

# set(CMAKE_CXX_STANDARD 17)

# add_executable(PythonCPPExample main.cpp)

# find_package(<PackageName> [version] [EXACT] [QUIET] [MODULE]
set(PYTHON_EXECUTABLE /root/anaconda3/envs/pytorch_1.7.1_cu92/bin/python3.8)
set(PYTHON_INCLUDE_DIR /root/anaconda3/envs/pytorch_1.7.1_cu92/include/python3.8)
set(PYTHON_LIBRARY /root/anaconda3/envs/pytorch_1.7.1_cu92/lib/libpython3.8.so)

find_package(PythonLibs 3 REQUIRED )
# 这个文件很重要
set(pybind11_DIR /root/anaconda3/envs/pytorch_1.7.1_cu92/share/cmake/pybind11/ ) # lib/python3.8/site-packages/pybind11 )
find_package(pybind11 REQUIRED)

message(STATUS " -XX- LIb path: ${PYTHON_INCLUDE_DIRS}")
message(STATUS " -XX- LIb path: ${pybind11_DIR}")
message(STATUS " -XX- LIb path: ${pybinSHARED ")

# add_subdirectory(src)

Pybind11_add_module(person
            src/Person.cpp
   d11_INCLUDE_DIRS}")

# .h 头文件路径
# include_directories(
#         ${PYTHON_INCLUDE_DIRS}
#         './src/'
#         ${pybind11_INCLUDE_DIRS}
#         )


# 库生成（动态SHARED，静态STATIC）
# add_library(person          src/p_person.cpp)

# 目标文件依赖库
# target_link_libraries(person ${PYTHON_LIBRARIES} pybind11::pybind11)

# install(TARGETS person DESTINATION ${PYTHON_INSTALL_DIR}/site-packages/ )

编译

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mkdir build
cd build
cmake ..
make

最终得到文件

person.cpython-38-x86_64-linux-gnu.so

python Call

  1. 当前环境下 CMakefile的环境下运行
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import person

if __name__ == '__main__':
    a = person.Person()
    # a = person.Person('Tom', 18)
    a.set_name("Tom")
    a.set_age(19)
    print(a.say_hello())

2、换个环境下运行

  • （此demo）只需要python版本一致，即可运行

ref

Python 中如何使用pybind11调用C++_pybind11 python调用c++-CSDN博客

pybind11：实现Python调用C++代码（入门）-CSDN博客