Qt调用python有参和无参方法，取方法返回值

环境准备

QT版本：4.8.5    下载地址：http://download.qt.io/archive/qt/4.8/4.8.5/

MinGW编译器：MinGW 32位    下载地址：https://osdn.net/projects/mingw/releases/

python版本：2.7 32位    下载地址：https://www.python.org/downloads/windows/

1、引用python库

pro 文件加入以下内容，其它版本可以尝试直接添加外部库

本机python安装目录：D:/Python1/Python27-32/

INCLUDEPATH += -I D:/Python1/Python27-32/include
LIBS += -LD:/Python1/Python27-32/libs/ -lpython27

2、添加python文件

#!/usr/bin/env python
# -*- coding: utf-8 -*-

def hello():
    print("hello world!")

def show(str):
    return str

def add(a, b):
    return a + b

3、调动无参无返回值方法

    // 导入 fun1.py 模块
    PyObject* fun1Py = PyImport_ImportModule("fun1");

    // 取fun1.py的hello方法
    PyObject* fhello = PyObject_GetAttrString(fun1Py,"hello");
    // 调用函数
    PyObject* fhelloc1 = PyObject_CallObject(fhello, NULL);
    PyObject* fhelloc2 = PyObject_CallFunction(fhello, NULL);
    PyObject* fhelloc3 = PyObject_CallFunctionObjArgs(fhello, NULL, NULL);

 4、调用QString类型参数返回QString类型的方法

    // 取fun1.py的show方法
    PyObject* fshow = PyObject_GetAttrString(fun1Py,"show");
    // 创建元组设置参数
    PyObject*  arg1 = PyString_FromString("perfect");
    PyObject*  args = PyTuple_New(1);
    PyTuple_SetItem(args, 0, arg1);

    PyObject* fshowc = PyObject_CallObject(fshow, args);
    if(fshowc) {
        QString result = PyString_AsString(fshowc);
        qDebug() << "result:" << result;
    }

 5、调用long类型参数返回long类型的方法

    // 取fun1.py的add方法
    PyObject* fadd = PyObject_GetAttrString(fun1Py,"add");
    // 创建元组设置参数
    PyObject* args = PyTuple_New(2);
    PyObject* arg1 = PyLong_FromLong(11111);
    PyObject* arg2 = PyLong_FromLong(22222);
    PyTuple_SetItem(args, 0, arg1);
    PyTuple_SetItem(args, 1, arg2);

    // 调用函数
    PyObject* faddc = PyObject_CallObject(fadd, args);
    if (faddc) {
        long result = PyLong_AsLong(faddc);
        qDebug() << "result:" << result;
    }

6、全部代码

#include <QCoreApplication>
#include <QtDebug>
#include <Python.h>

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    qDebug() << "==========start============";

    // 初始化python环境
    Py_Initialize();
    if(!Py_IsInitialized()){
        qDebug()<<"Py_Initialize fail!";
    }

    PyRun_SimpleString("print 'this is python print'");

    PyObject* args;
    PyObject* arg1;
    PyObject* arg2;

    // 导入 fun1.py 模块
    PyObject* fun1Py = PyImport_ImportModule("fun1");

    // 取fun1.py的hello方法
    PyObject* fhello = PyObject_GetAttrString(fun1Py,"hello");
    // 调用函数
//    PyObject* fhelloc = PyObject_CallObject(fhello, NULL);
//    PyObject* fhelloc = PyObject_CallFunction(fhello, NULL);
    PyObject* fhelloc = PyObject_CallFunctionObjArgs(fhello, NULL, NULL);

    // 取fun1.py的show方法
    PyObject* fshow = PyObject_GetAttrString(fun1Py,"show");
    // 创建元组设置参数
    arg1 = PyString_FromString("perfect");
    args = PyTuple_New(1);
    PyTuple_SetItem(args, 0, arg1);

    PyObject* fshowc = PyObject_CallObject(fshow, args);
    if(fshowc) {
        QString result = PyString_AsString(fshowc);
        qDebug() << "result:" << result;
    }

    // 取fun1.py的add方法
    PyObject* fadd = PyObject_GetAttrString(fun1Py,"add");
    // 创建元组设置参数
    args = PyTuple_New(2);
    arg1 = PyLong_FromLong(11111);
    arg2 = PyLong_FromLong(22222);
    PyTuple_SetItem(args, 0, arg1);
    PyTuple_SetItem(args, 1, arg2);

    // 调用函数
    PyObject* faddc = PyObject_CallObject(fadd, args);
    if (faddc) {
        long result = PyLong_AsLong(faddc);
        qDebug() << "result:" << result;
    }

    Py_Finalize();
    qDebug() << "==========end============";

    return a.exec();
}

7、运行效果