基于 Qt5.10.1 调用 Python 脚本实现简单的四则运算
https://github.com/mygit03/TestPython.git
首先建立一个工程；
导入Python库；
新建 Python 脚本
TestPython.pro
#-------------------------------------------------
#
# Project created by QtCreator 2018-12-25T15:29:45
#
#-------------------------------------------------
QT += core gui
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
TARGET = TestPython
TEMPLATE = app
# The following define makes your compiler emit warnings if you use
# any feature of Qt which has been marked as deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS
# You can also make your code fail to compile if you use deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000 # disables all the APIs deprecated before Qt 6.0.0
SOURCES += \
main.cpp \
widget.cpp
HEADERS += \
widget.h
unix|win32: LIBS += -LC:/Python27/libs/ -lpython27
INCLUDEPATH += C:/Python27/include
DEPENDPATH += C:/Python27/include
DISTFILES += \
pytest.pywidget.h
#ifndef WIDGET_H
#define WIDGET_H
#include <QWidget>
#include <QLabel>
#include <QLineEdit>
#include <QDoubleSpinBox>
#include <QPushButton>
#include <Python.h>
enum{
Method_sum = 0,
Method_sub = 1,
Method_mul = 2,
Method_div = 3,
Method_mod = 4,
};
class Widget : public QWidget
{
Q_OBJECT
public:
Widget(QWidget *parent = 0);
~Widget();
void init();
void CallPython(const QString file);
void CalulateMethod(const char * method, int type = Method_sum);
private slots:
void choosePythonFile();
void calculate();
private:
QLabel *m_pFileLabel;
QLineEdit *m_pFileLE;
QPushButton *m_pFileBtn;
QLabel *m_pALabel;
QDoubleSpinBox *m_pADoubleSpinBox;
QLabel *m_pBLabel;
QDoubleSpinBox *m_pBDoubleSpinBox;
QPushButton *m_pCalculateBtn;
QLabel *m_pSumLabel;
QLineEdit *m_pSumLE;
QLabel *m_pSubLabel;
QLineEdit *m_pSubLE;
QLabel *m_pMulLabel;
QLineEdit *m_pMulLE;
QLabel *m_pDivLabel;
QLineEdit *m_pDivLE;
QLabel *m_pModLabel;
QLineEdit *m_pModLE;
PyObject *m_pModule;
PyObject *m_pArgs;
};
#endif // WIDGET_Hwidget.cpp
#include "widget.h"
#include <QGridLayout>
#include <QFileDialog>
//#include <Python.h>
#include <iostream>
using namespace std;
Widget::Widget(QWidget *parent)
: QWidget(parent)
{
setWindowTitle(tr("调用Python脚本实现简单的四则运算"));
init();
}
Widget::~Widget()
{
}
void Widget::init()
{
QGridLayout *gridLayout = new QGridLayout(this);
m_pFileLabel = new QLabel(tr("Python File:"), this);
gridLayout->addWidget(m_pFileLabel, 0, 0, 1, 1);
m_pFileLE = new QLineEdit(this);
m_pFileLE->setReadOnly(true);
gridLayout->addWidget(m_pFileLE, 0, 1, 1, 5);
m_pFileBtn = new QPushButton(tr("选择"), this);
connect(m_pFileBtn, SIGNAL(clicked(bool)), this, SLOT(choosePythonFile()));
gridLayout->addWidget(m_pFileBtn, 0, 6, 1, 1);
m_pALabel = new QLabel(tr("参数a:"), this);
m_pALabel->setAlignment(Qt::AlignRight | Qt::AlignVCenter);
gridLayout->addWidget(m_pALabel, 1, 0, 1, 1);
m_pADoubleSpinBox = new QDoubleSpinBox(this);
m_pADoubleSpinBox->setToolTip(tr("参数a"));
gridLayout->addWidget(m_pADoubleSpinBox, 1, 1, 1, 1);
m_pBLabel = new QLabel(tr("参数b:"), this);
m_pBLabel->setAlignment(Qt::AlignRight | Qt::AlignVCenter);
gridLayout->addWidget(m_pBLabel, 1, 2, 1, 1);
m_pBDoubleSpinBox = new QDoubleSpinBox(this);
m_pBDoubleSpinBox->setToolTip(tr("参数b"));
gridLayout->addWidget(m_pBDoubleSpinBox, 1, 3, 1, 1);
m_pCalculateBtn = new QPushButton(tr("计算"), this);
connect(m_pCalculateBtn, SIGNAL(clicked(bool)), this, SLOT(calculate()));
gridLayout->addWidget(m_pCalculateBtn, 1, 6, 1, 1);
m_pSumLabel = new QLabel(tr("Sum:"), this);
m_pSumLabel->setAlignment(Qt::AlignRight | Qt::AlignVCenter);
gridLayout->addWidget(m_pSumLabel, 2, 0, 1, 1);
m_pSumLE = new QLineEdit(this);
m_pSumLE->setReadOnly(true);
gridLayout->addWidget(m_pSumLE, 2, 1, 1, 1);
m_pSubLabel = new QLabel(tr("Sub:"), this);
m_pSubLabel->setAlignment(Qt::AlignRight | Qt::AlignVCenter);
gridLayout->addWidget(m_pSubLabel, 2, 2, 1, 1);
m_pSubLE = new QLineEdit(this);
m_pSubLE->setReadOnly(true);
gridLayout->addWidget(m_pSubLE, 2, 3, 1, 1);
m_pMulLabel = new QLabel(tr("Mul:"), this);
m_pMulLabel->setAlignment(Qt::AlignRight | Qt::AlignVCenter);
gridLayout->addWidget(m_pMulLabel, 2, 4, 1, 1);
m_pMulLE = new QLineEdit(this);
m_pMulLE->setReadOnly(true);
gridLayout->addWidget(m_pMulLE, 2, 5, 1, 1);
m_pDivLabel = new QLabel(tr("Div:"), this);
m_pDivLabel->setAlignment(Qt::AlignRight | Qt::AlignVCenter);
gridLayout->addWidget(m_pDivLabel, 3, 0, 1, 1);
m_pDivLE = new QLineEdit(this);
m_pDivLE->setReadOnly(true);
gridLayout->addWidget(m_pDivLE, 3, 1, 1, 1);
m_pModLabel = new QLabel(tr("Mod:"), this);
m_pModLabel->setAlignment(Qt::AlignRight | Qt::AlignVCenter);
gridLayout->addWidget(m_pModLabel, 3, 2, 1, 1);
m_pModLE = new QLineEdit(this);
m_pModLE->setReadOnly(true);
gridLayout->addWidget(m_pModLE, 3, 3, 1, 1);
}
void Widget::CallPython(const QString file)
{
Py_Initialize(); // 初始化
string chdir_cmd;
// 将Python工作路径切换到待调用模块所在目录,一定要保证路径名的正确性
string path = "E:/Qt/TestPython";
if (!file.isEmpty())
{
path = QFileInfo(file).absolutePath().toStdString();
}
chdir_cmd = string("sys.path.append(\"") + path + "\")";
const char* cstr_cmd = chdir_cmd.c_str();
PyRun_SimpleString("import sys");
PyRun_SimpleString(cstr_cmd);
// 加载模块
PyObject* moduleName = PyString_FromString("pytest"); //模块名,不是文件名(文件名不加后缀)
PyObject* pModule = PyImport_Import(moduleName);
if (!pModule) // 加载模块失败
{
cout << "[ERROR] Python get module failed." << endl;
return;
}
cout << "[INFO] Python get module succeed." << endl;
// 设置参数
double a = m_pADoubleSpinBox->value();
double b = m_pBDoubleSpinBox->value();
PyObject* args = PyTuple_New(2); // 2个参数
PyObject* arg1 = PyInt_FromLong(a); // 参数一设为4
PyObject* arg2 = PyInt_FromLong(b); // 参数二设为3
PyTuple_SetItem(args, 0, arg1);
PyTuple_SetItem(args, 1, arg2);
#if 0
// 加载函数
PyObject* pv = PyObject_GetAttrString(pModule, "sum");
if (!pv || !PyCallable_Check(pv)) // 验证是否加载成功
{
cout << "[ERROR] Can't find funftion (sum)" << endl;
return;
}
cout << "[INFO] Get function (add) succeed." << endl;
// 调用函数
PyObject* pRet = PyObject_CallObject(pv, args);
// 获取结果
if (pRet) // 验证是否调用成功
{
long result = PyInt_AsLong(pRet);
}
#endif
m_pModule = pModule;
m_pArgs = args;
CalulateMethod("sum", Method_sum);
CalulateMethod("sub", Method_sub);
CalulateMethod("mul", Method_mul);
CalulateMethod("div", Method_div);
CalulateMethod("mod", Method_mod);
Py_Finalize();
}
void Widget::CalulateMethod(const char *method, int type)
{
// 加载函数
PyObject* pv = PyObject_GetAttrString(m_pModule, method);
if (!pv || !PyCallable_Check(pv)) // 验证是否加载成功
{
cout << "[ERROR] Can't find funftion (sum)" << endl;
return;
}
cout << "[INFO] Get function (add) succeed." << endl;
// 调用函数
PyObject* pRet = PyObject_CallObject(pv, m_pArgs);
// 获取结果
long result = 0;
if (pRet) // 验证是否调用成功
{
result = PyInt_AsLong(pRet);
}
// 显示结果
switch (type) {
case Method_sum:
m_pSumLE->setText(QString::number(result));
break;
case Method_sub:
m_pSubLE->setText(QString::number(result));
break;
case Method_mul:
m_pMulLE->setText(QString::number(result));
break;
case Method_div:
m_pDivLE->setText(QString::number(result));
break;
case Method_mod:
m_pModLE->setText(QString::number(result));
break;
default:
break;
}
}
void Widget::choosePythonFile()
{
QString filename = QFileDialog::getOpenFileName(this, tr("选择文件"), ".", tr("Python File(*.py);;ALL FILE(*.*)"));
if (!filename.isEmpty())
m_pFileLE->setText(filename);
}
void Widget::calculate()
{
QString filename = m_pFileLE->text();
CallPython(filename);
}pytest.py
#!/usr/bin/env python
# -*- coding: utf-8 -*-
def sum(a,b):
print "a",a,"b",b
print "sum:",a+b
return a+b
def sub(a,b):
print "a",a,"b",b
print "sub:",a-b
return a-b
def mul(a,b):
print "a",a,"b",b
print "mul:",a*b
return a*b
def div(a,b):
print "a",a,"b",b
print "div:",a/b
return a/b
def mod(a,b):
print "a",a,"b",b
print "mod:",a%b
return a%b