# Python环境配置find_package(Python2.7 COMPONENTS Interpreter Development REQUIRED)include_directories(${PYTHON_INCLUDE_DIR})

class MyWindow : public QMainWindow{Q_OBJECTpublic:    explicit MyWindow(QWidget *parent = 0);    //销毁资源    virtual ~MyWindow();    //异步调用方法需设置为static    static QString callPython(QString selectedValue);public slots:    void onValueChanged();    void onComboChanged(int idx);private:    //任务监听    QFutureWatcher<QString> *myWatcher;    QComboBox *myCombo;    QString myValue;}

QFutureWatcher\<QString\> *myWatcher = dynamic_cast<QFutureWatcher\<QString\> *\>(this->sender());

#include <Python.h>
MyWindow::MyWindow(QWidget *parent) :        QMainWindow(parent),        ui(new Ui::MyWindow),        m_Model(NULL) {    ui->setupUi(this);    myCombo = new QComboBox(this);    //...初始化combobox    //绑定comboBoxchange事件    connect(myCombo, SIGNAL(currentIndexChanged(int)), SLOT(onComboChanged(int)));    myWatcher = new QFutureWatcher<QString>(this);    //监听任务结束事件    connect(myWatcher, SIGNAL(finished()), this, SLOT(onValueChanged())); ...  }        MyWindow::~MyWindow() {        //销毁资源        myWatcher->cancel();        myWatcher->waitForFinished();        delete myWatcher;    }  void MyWindow::onComboChanged(int idx) {        QString selectedValue = myCombo->currentData().value<QString>();        QFuture<QString> myFuture = QtConcurrent::run(MyWindow::callPython, selectedValue);        cacWatcher->setFuture(myFuture);    }
QString MyWindow::callPython(QString selectedValue){            QString result = "";            if(Py_IsInitialized() == 0){                Py_Initialize();            }            QString filename = "py文件路径";            QFileInfo filepath = QFileInfo(filename);            QString path = filepath.absolutePath();            PyObject *sys = PyImport_ImportModule("sys");            PyObject *syspath = PyObject_GetAttrString(sys, "path");            PyList_Insert(syspath, 0, PyString_FromFormat(path.toStdString().c_str()));            filename = filepath.fileName().split(".")[0];            PyObject *pName = PyString_FromString(filename.toStdString().c_str());            PyObject *pModule = PyImport_Import(pName);            if (pModule != NULL) {                PyObject *pDict = PyModule_GetDict(pModule);                PyObject *pFunc = PyDict_GetItem(pDict, PyString_FromString("函数名称"));                if (pFunc != NULL) {                    PyObject *pyParams = PyTuple_New(2);                    PyTuple_SetItem(pyParams, 0, Py_BuildValue("s", selectedValue.toStdString().c_str()));
                    PyObject *pythonResult = PyObject_CallObject(pFunc, pyParams);                    result = QString(PyString_AsString(pythonResult).c_str());
                } else {                    msgBox.setText("can't find function");                    msgBox.exec();                }            } else {                msgBox.setText("can't find dir");                msgBox.exec();            }        } catch (std::exception &err) {            msgBox.setText(err.what());            msgBox.exec();        }        return result;}
    void MyWindow::onValueChanged() {        this->myValue = myWatcher->result();        // ...业务代码    }

import os
def call_python(param):    helloStr = "Hello in Python "+param;    return helloStr;