Using C++, how can I run a python file in Qt Designer?

Question

I've finally decided to make the transition from WxPython to QT! I'm using Qt Designer5.9, but I'm having issues placing a new slot. My goal is to press a button on the GUI and have a function run that I have written in another python program.

In Qt Designer, I "go to slot", select clicked() and this appears.

mainwindow.cpp

void MainWindow::on_pushButton_2_clicked()
{

}

Which is exactly what I want, but the wrong language! My python is bad enough let alone anything else. So by running this tutorial I know that if I pass through ui->textEdit->append(("Hello World")); I can do something custom, but after converting using pyuic to convert to .py it's not obvious how it's being implemented. My function is easy to import as shown below, I just need to know where to put it.

import myfunction
myfunction()

Can anyone give me an example of what needs to be written in C++ in Qt Designer so I can call my python function after .ui conversion??

If you want to used embedding python in C++ you can refer this link. doc.qt.io/archives/qq/qq23-pythonqt.html However it's quite complicate you need to have available python libs first. — Shihe Zhang
– Shihe Zhang, Commented Jun 16, 2017 at 2:17
This is PyQt5, Qt Designer is the visual implementation of it so you can drag and drop buttons. — RknRobin
– RknRobin, Commented Jun 16, 2017 at 2:24
Maybe it's not clear but I am essentially asking how to do it in PyQt. — RknRobin
– RknRobin, Commented Jun 16, 2017 at 2:27
you could transfer the origin Qt Designer .ui file to .py file rather than use the cpp file generated by Qt.python pyuic.py -o pathto/Pyfile pathto/Uifileif using pyqt you should have pyuic — Shihe Zhang
– Shihe Zhang, Commented Jun 16, 2017 at 2:33

Kit A. · Accepted Answer · 2017-06-16 02:44:48Z

1

I don't know why you need C++, you can do what you want in python. Design your UI in QT Designer. I like to avoid using pyuic, I prefer using the following way, maybe you will find it better. Say your UI file is called something.ui, and you have named your button in QT Designer pushButton_2, then the code in python will be:

from PyQt4 import QtCore, QtGui, uic
Ui_somewindow, _ = uic.loadUiType("something.ui") #the path to your UI

class SomeWindow(QtGui.QMainWindow, Ui_somewindow):
    def __init__(self):
        QtGui.QMainWindow.__init__(self)
        Ui_somewindow.__init__(self)
        self.setupUi(self)
        self.pushButton_2.clicked.connect(self.yourFunction)

   def yourFunction(self):
        #the function you imported or anything you want to happen when the button is clicked.

if __name__ == "__main__":
    app = QtGui.QApplication(sys.argv)
    window = SomeWindow()
    window.show()
    sys.exit(app.exec_())

Hope this helps!

answered Jun 16, 2017 at 2:44

Kit A.

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1 Comment

RknRobin Over a year ago

This is a different workflow than I was expecting but this is the exact answer I was looking for thanks!

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