在这种情况下，我将如何使 openFileDialog 打开 txt 文件答案

【问题标题】：how would I make the openFileDialog open txt file in this case在这种情况下，我将如何使 openFileDialog 打开 txt 文件
【发布时间】：2021-12-27 23:49:35
【问题描述】：

我想拥有 fname = QFileDialog(self,'源文本','','txt(*.txt)') 调用函数 openFileDialog 时运行我曾尝试使用 lambda 而不是普通函数，但这并没有奏效我正在尝试制作一个加密程序并正在设置基本的文本上传系统我目前正在尝试将 fname 设置为文件名

import sys

from PyQt6 import QtCore, QtGui, QtWidgets
from PyQt6.QtWidgets import QDialog, QApplication, QFileDialog

from tkinter import filedialog

def Encrypt(SourceText):
    print (SourceText)

class Ui_MainWindow(object):
    
    
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(886, 487)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.gridLayout = QtWidgets.QGridLayout(self.centralwidget)
        self.gridLayout.setObjectName("gridLayout")
        self.Enter = QtWidgets.QPushButton(self.centralwidget)
        self.Enter.clicked.connect(self.clicked)
        self.Enter.setObjectName("Enter")
        self.gridLayout.addWidget(self.Enter, 2, 0, 1, 1)
        self.label = QtWidgets.QLabel(self.centralwidget)
        self.label.setLayoutDirection(QtCore.Qt.LayoutDirection.RightToLeft)
        self.label.setAlignment(QtCore.Qt.AlignmentFlag.AlignCenter)
        self.label.setObjectName("label")
        self.gridLayout.addWidget(self.label, 0, 0, 1, 1)
        self.plainTextEdit = QtWidgets.QPlainTextEdit(self.centralwidget)
        self.plainTextEdit.setObjectName("plainTextEdit")
        self.gridLayout.addWidget(self.plainTextEdit, 1, 0, 1, 1)
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 886, 20))
        self.menubar.setObjectName("menubar")
        self.menuFile = QtWidgets.QMenu(self.menubar)
        self.menuFile.setObjectName("menuFile")
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)
        self.actionUpload = QtGui.QAction(MainWindow)
        self.actionUpload.setShortcutContext(
            QtCore.Qt.ShortcutContext.WindowShortcut)
        self.actionUpload.setMenuRole(QtGui.QAction.MenuRole.AboutQtRole)
        self.actionUpload.setObjectName("actionUpload")
        self.menuFile.addAction(self.actionUpload)
        self.menubar.addAction(self.menuFile.menuAction())
        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)
        self.actionUpload.triggered.connect(lambda: self.Open("File Uploaded"))

    def clicked(self):
        Encrypt(self.plainTextEdit.toPlainText())

    def openFileDialog(self):
        fname = QFileDialog(self,'Source Text','','txt(*.txt)')


    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
        self.Enter.setText(_translate("MainWindow", "Enter"))
        self.label.setText(_translate(
            "MainWindow", "Enter Text Below Or Upload File"))
        self.menuFile.setTitle(_translate("MainWindow", "File"))
        self.actionUpload.setText(_translate("MainWindow", "Upload"))
        self.actionUpload.setShortcut(_translate("MainWindow","Ctrl+O"))


    def Open(self, text):
        openFileDialog()
        print (text)


if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    MainWindow = QtWidgets.QMainWindow()
    ui = Ui_MainWindow()
    ui.setupUi(MainWindow)
    MainWindow.show()
    sys.exit(app.exec())

【问题讨论】：

标签： python pyqt pyqt6

【解决方案1】：

您必须使用QFileDialog().getOpenFileName(parent, caption, path, filter) 而不是QFileDialog(parent, caption, path, filter)：

import sys

from PyQt6 import QtCore, QtGui, QtWidgets
from PyQt6.QtWidgets import QDialog, QApplication, QFileDialog

from tkinter import filedialog


def Encrypt(SourceText):
    print(SourceText)


class Ui_MainWindow(object):

    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(886, 487)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.gridLayout = QtWidgets.QGridLayout(self.centralwidget)
        self.gridLayout.setObjectName("gridLayout")
        self.Enter = QtWidgets.QPushButton(self.centralwidget)
        self.Enter.clicked.connect(self.clicked)
        self.Enter.setObjectName("Enter")
        self.gridLayout.addWidget(self.Enter, 2, 0, 1, 1)
        self.label = QtWidgets.QLabel(self.centralwidget)
        self.label.setLayoutDirection(QtCore.Qt.LayoutDirection.RightToLeft)
        self.label.setAlignment(QtCore.Qt.AlignmentFlag.AlignCenter)
        self.label.setObjectName("label")
        self.gridLayout.addWidget(self.label, 0, 0, 1, 1)
        self.plainTextEdit = QtWidgets.QPlainTextEdit(self.centralwidget)
        self.plainTextEdit.setObjectName("plainTextEdit")
        self.gridLayout.addWidget(self.plainTextEdit, 1, 0, 1, 1)
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 886, 20))
        self.menubar.setObjectName("menubar")
        self.menuFile = QtWidgets.QMenu(self.menubar)
        self.menuFile.setObjectName("menuFile")
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)
        self.actionUpload = QtGui.QAction(MainWindow)
        self.actionUpload.setShortcutContext(
            QtCore.Qt.ShortcutContext.WindowShortcut)
        self.actionUpload.setMenuRole(QtGui.QAction.MenuRole.AboutQtRole)
        self.actionUpload.setObjectName("actionUpload")
        self.menuFile.addAction(self.actionUpload)
        self.menubar.addAction(self.menuFile.menuAction())
        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)
        self.actionUpload.triggered.connect(lambda: self.Open("File Uploaded"))

    def clicked(self):
        Encrypt(self.plainTextEdit.toPlainText())

    def openFileDialog(self):
        fname, _ = QFileDialog().getOpenFileName(self, 'Source Text', '', 'Text files (*.txt)')

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
        self.Enter.setText(_translate("MainWindow", "Enter"))
        self.label.setText(_translate(
            "MainWindow", "Enter Text Below Or Upload File"))
        self.menuFile.setTitle(_translate("MainWindow", "File"))
        self.actionUpload.setText(_translate("MainWindow", "Upload"))
        self.actionUpload.setShortcut(_translate("MainWindow", "Ctrl+O"))

    def Open(self, text):
        self.openFileDialog()
        print(text)


if __name__ == "__main__":
    import sys

    app = QtWidgets.QApplication(sys.argv)
    MainWindow = QtWidgets.QMainWindow()
    ui = Ui_MainWindow()
    ui.setupUi(MainWindow)
    MainWindow.show()
    sys.exit(app.exec())

【讨论】：