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QT Of button events Open Call in slot function python function

One 、C++ The interface of the development selection file is passed to python

Development Select File Interface to python call . Here is a global method to open the dialog box

#include <QFileDialog>
using namespace std;
static PyObject *pModule = 0;
// Returns the selected file path 
PyObject* OpenDialog(PyObject *self)
{

QString fileName = "";
fileName = QFileDialog::getOpenFileName();
if (fileName.isEmpty())
return PyUnicode_FromString("");
return PyUnicode_FromString(fileName.toStdString().c_str());
}

Two 、 Add slot function

double-click PyPlayer.ui file , open Qt The designer , Add a button ：

Then add a slot function for this control

stay C++ Of PyPlayer.h Add the definition of slot function in ：

#pragma once
#include <QtWidgets/QWidget>
#include "ui_PyPlayer.h"
class PyPlayer : public QWidget
{

Q_OBJECT
public:
PyPlayer(QWidget *parent = Q_NULLPTR);
public slots:
void Open();
private:
Ui::PyPlayerClass ui;
};

Its implementation is to call python Medium opoen function

void PyPlayer::Open() {

cout << "PyPlayer::Open()" << endl;
// call Python Of open function
}

Run it ：

You can see that the control binding is successful ：

3、 ... and 、 call python Medium open function

stay pyqt.py Add open Definition of function ：

def open():
print("Python open")
filename = OpenDialog()
print(filename)

C++ End pass PyPlayer::Open() Call the above python Of open function ：

void PyPlayer::Open() {

cout << "PyPlayer::Open()" << endl;
// call Python Of open function 
if (!pModule) return;
PyObject *open = PyObject_GetAttrString(pModule, "open");
if (!open || !PyCallable_Check(open))
{

PyErr_Print();
return;
}
PyObject_CallObject(open, 0);
}

Four 、 Pass on C++ Write global functions opendialog to python

So how to be in python How to call C++ Write global functions opendialog Well ？

Can be opened in a constructor ：

PyPlayer::PyPlayer(QWidget *parent)
: QWidget(parent)
{

ui.setupUi(this);
Py_SetPythonHome(L"./");
Py_Initialize();
// Loading module 
pModule = PyImport_ImportModule("pyqt");
if (!pModule)
{

printf("PyImport import error");
PyErr_Print();
return;
}
// obtain python Configuration item Change the size and title of the window 
PyObject *conf = PyObject_GetAttrString(pModule, "conf");
if (!conf)
{

cout << "Please set the conf" << endl;
PyErr_Print();
return;
}
PyObject *key = PyUnicode_FromString("width");
int width = PyLong_AsLong(PyDict_GetItem(conf, key));
Py_XDECREF(key);
key = PyUnicode_FromString("height");
int height = PyLong_AsLong(PyDict_GetItem(conf, key));
Py_XDECREF(key);
// Change window title 
key = PyUnicode_FromString("title");
wchar_t title[1024] = {
 0 };
PyUnicode_AsWideChar(PyDict_GetItem(conf, key), title, 1023);
this->setWindowTitle(QString::fromUtf16((char16_t*)title));
Py_XDECREF(key);
if (width > 0 && height > 0)
{

resize(width, height);
}
Py_XDECREF(conf);
// Open the interface for selecting files to python
static PyMethodDef meths[] = {

{
"OpenDialog", (PyCFunction)OpenDialog, METH_NOARGS, 0}
,{
NULL}
};
int re = PyModule_AddFunctions(pModule, meths);
if (!re)
{

PyErr_Print();
}
// Open thread call python Of main function 
}

In this case , Run to find , We can print the path of the selected file by clicking the open button

5、 ... and 、 summary

• This article demonstrates QT Of button events Open Call in slot function python function .
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