File dialog not working with PyQt5?

Question

This is my first time attempting to create a GUI. I have created a simple program with a button that is supposed to open the file browser and return that file. I know PyQt5 has some built in file dialog commands, but they are not working for me. I attempted to use the tutorial found on https://pythonspot.com/en/pyqt5-file-dialog/. I also tried several other approaches from online. I cannot think of a reason why it is not working.

import sys, os
from PyQt5.QtWidgets import QMainWindow, QApplication, QWidget, QInputDialog, QLineEdit, QFileDialog
from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtGui import QIcon


class Ui_Form(object):
    def setupUi(self, Form):
        Form.setObjectName("Form")
        Form.resize(1082, 800)
        self.horizontalLayout_2 = QtWidgets.QHBoxLayout(Form)
        self.horizontalLayout_2.setObjectName("horizontalLayout_2")
        self.horizontalLayout = QtWidgets.QHBoxLayout()
        self.horizontalLayout.setObjectName("horizontalLayout")
        self.pushButton = QtWidgets.QPushButton(Form)
        self.pushButton.setObjectName("pushButton")
        self.horizontalLayout.addWidget(self.pushButton)
        self.horizontalLayout_2.addLayout(self.horizontalLayout)

        self.retranslateUi(Form)
        QtCore.QMetaObject.connectSlotsByName(Form)

        self.pushButton.clicked.connect(self.openFile)


    def retranslateUi(self, Form):
        _translate = QtCore.QCoreApplication.translate
        Form.setWindowTitle(_translate("Form", "Form"))
        self.pushButton.setText(_translate("Form", "PushButton"))


    # FUNCTION BELOW NOT WORKING
    def openFile(self):   
    options = QFileDialog.Options()
    options |= QFileDialog.DontUseNativeDialog
    fileName, _ = QFileDialog.getOpenFileName(self,"QFileDialog.getOpenFileName()", "","All Files (*);;Python Files (*.py)", options=options)
    if fileName:
        print(fileName)


if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    Form = QtWidgets.QWidget()
    ui = Ui_Form()
    ui.setupUi(Form)
    Form.show()
    sys.exit(app.exec_())

eyllanesc · Accepted Answer · 2018-02-09 15:57:47Z

12

getOpenFileName requires as a parameter an object of type QWidget, in your case Ui_Form is not of that type.

First Solution: pass None:

fileName, _ = QFileDialog.getOpenFileName(None,"QFileDialog.getOpenFileName()", "","All Files (*);;Python Files (*.py)", options=options)

Second solution: create a class that implements the Ui_Form visa, and in it the openFile slot is created.

class Widget(QtWidgets.QWidget, Ui_Form):
    def __init__(self, parent=None):
        QtWidgets.QWidget.__init__(self, parent)
        self.setupUi(self)
        self.pushButton.clicked.connect(self.openFile)

    def openFile(self):   
        options = QFileDialog.Options()
        options |= QFileDialog.DontUseNativeDialog
        fileName, _ = QFileDialog.getOpenFileName(self,"QFileDialog.getOpenFileName()", "","All Files (*);;Python Files (*.py)", options=options)
        if fileName:
            print(fileName)

edited Feb 9, 2018 at 15:57

answered May 19, 2017 at 17:43

eyllanesc

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3 Comments

J. Doe Over a year ago

Works perfectly.

J. Doe Over a year ago

I also found another solution (which I posted below). What is the difference in functionality between the two solutions?

eyllanesc Over a year ago

@J.Doe what happened?

Harvey · Accepted Answer · 2017-05-19 17:46:26Z

1

You need to pass a QWidget as the parent. I modified your code to save the Form and use that later.

class Ui_Form(object):
    def setupUi(self, Form):
        self.Form = Form          # <-----
        ...

    def openFile(self):   
        fileName, _ = QFileDialog.getOpenFileName(self.Form,    # <-----
        ...

answered May 19, 2017 at 17:46

Harvey

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Comments

J. Doe · Accepted Answer · 2017-05-19 17:51:16Z

1

Another solution I found was to change the function to:

def openFileNameDialog(self):    
    fname = QFileDialog.getOpenFileName()
    self.ui.lineEdit.setText(fname)

answered May 19, 2017 at 17:51

J. Doe

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