关闭应用程序后如何在QListWidgets中保存和重新加载项目？

Question

我在python编程世界中还是一个新手。我正在编写一个GUI，允许用户插入一些数据。我正在使用PyQt5，并尝试使用这些功能在重新打开应用程序后从.ini文件中保存和重新加载小部件状态。

from PyQt5 import QtCore, QtGui, QtWidgets


def value_is_valid(val):
    if isinstance(val, QtGui.QPixmap):
        return not val.isNull()
    return True


def restore(settings):
    finfo = QtCore.QFileInfo(settings.fileName())

if finfo.exists() and finfo.isFile():
    for w in QtWidgets.qApp.allWidgets():
        if w.objectName():
            mo = w.metaObject()
            for i in range(mo.propertyCount()):
                prop = mo.property(i)
                name = prop.name()
                last_value = w.property(name)
                key = "{}/{}".format(w.objectName(), name)
                if not settings.contains(key):
                    continue
                val = settings.value(key, type=type(last_value),)
                if (
                    val != last_value
                    and value_is_valid(val)
                    and prop.isValid()
                    and prop.isWritable()
                ):
                    w.setProperty(name, val)


def save(settings):
    for w in QtWidgets.qApp.allWidgets():
        if w.objectName():
            mo = w.metaObject()
            for i in range(mo.propertyCount()):
                prop = mo.property(i)
                name = prop.name()
                key = "{}/{}".format(w.objectName(), name)
                val = w.property(name)
                if value_is_valid(val) and prop.isValid() and prop.isWritable():
                    settings.setValue(key, w.property(name))

我想在我的表单中从QListWidgets保存并重新加载项目。目前还没有发生。任何帮助和建议，表示赞赏。谢谢

Answer 1

这是如何使用这些功能的示例。如您所见，可以恢复@NicholasTJ行编辑，但不能恢复您在QListWidget中添加的项目。

from PyQt5.QtCore import *
from PyQt5 import QtCore, QtGui, QtWidgets


class Ui_Form(object):
    def setupUi(self, Form):
        Form.setObjectName("Form")
        Form.resize(366, 376)
        self.pushButton = QtWidgets.QPushButton(Form)
        self.pushButton.setGeometry(QtCore.QRect(60, 70, 93, 28))
        self.pushButton.setObjectName("pushButton")
        self.listWidget = QtWidgets.QListWidget(Form)
        self.listWidget.setGeometry(QtCore.QRect(60, 110, 256, 192))
        self.listWidget.setObjectName("listWidget")
        self.lineEdit = QtWidgets.QLineEdit(Form)
        self.lineEdit.setGeometry(QtCore.QRect(170, 70, 113, 21))
        self.lineEdit.setObjectName("lineEdit")

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

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

class MyForm(QtWidgets.QWidget):
    settings = QSettings("gui.ini", QSettings.IniFormat)

    def __init__(self, parent=None):
        QtWidgets.QWidget.__init__(self, parent)
        self.ui = Ui_Form()
        self.ui.setupUi(self)

        restore(self.settings)

        self.ui.pushButton.clicked.connect(self.addbutton)

    def addbutton(self):
        if self.ui.lineEdit.text():
            self.ui.listWidget.addItem(self.ui.lineEdit.text().upper())
            self.ui.lineEdit.setText("")

    def closeEvent(self, event):
        save(self.settings)
        QtWidgets.QWidget.closeEvent(self, event)

def value_is_valid(val):
    if isinstance(val, QtGui.QPixmap):
        return not val.isNull()
    return True


def restore(settings):
    finfo = QtCore.QFileInfo(settings.fileName())

    if finfo.exists() and finfo.isFile():
        for w in QtWidgets.qApp.allWidgets():
            if w.objectName():
                mo = w.metaObject()
                for i in range(mo.propertyCount()):
                    prop = mo.property(i)
                    name = prop.name()
                    last_value = w.property(name)
                    key = "{}/{}".format(w.objectName(), name)
                    if not settings.contains(key):
                        continue
                    val = settings.value(key, type=type(last_value),)
                    if (
                        val != last_value
                        and value_is_valid(val)
                        and prop.isValid()
                        and prop.isWritable()
                    ):
                        w.setProperty(name, val)


def save(settings):
    for w in QtWidgets.qApp.allWidgets():
        if w.objectName():
            mo = w.metaObject()
            for i in range(mo.propertyCount()):
                prop = mo.property(i)
                name = prop.name()
                key = "{}/{}".format(w.objectName(), name)
                val = w.property(name)
                if value_is_valid(val) and prop.isValid() and prop.isWritable():
                    settings.setValue(key, w.property(name))

if __name__ == "__main__":
    import sys

    app = QtWidgets.QApplication(sys.argv)
    form = MyForm()

    form.show()
    sys.exit(app.exec_())