Qt调用python有参和无参方法，取方法返回值

你的名字 2022-12-09 03:13 344阅读 0赞

### 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/][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/][https_osdn.net_projects_mingw_releases]

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

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxMjYyNTkzNDIx_size_16_color_FFFFFF_t_70][]

#!/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 ###

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxMjYyNTkzNDIx_size_16_color_FFFFFF_t_70 1][]

[http_download.qt.io_archive_qt_4.8_4.8.5]: http://download.qt.io/archive/qt/4.8/4.8.5/
[https_osdn.net_projects_mingw_releases]: https://osdn.net/projects/mingw/releases/
[https_www.python.org_downloads_windows]: https://www.python.org/downloads/windows/
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxMjYyNTkzNDIx_size_16_color_FFFFFF_t_70]: /images/20221123/443e506fd9fd4b619e9959627ed64de4.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxMjYyNTkzNDIx_size_16_color_FFFFFF_t_70 1]: /images/20221123/1e6a52eb86364ac390670cf025dedfde.png