Using QSettings() to save values of QTableWidgetItem and display values even after reopening a window

rahulr22

Hi,
Previously, I have used QSettings to save values in a QLineEdit into an integer variable and display the same values even after closing and then opening a window. However, when I try to save QTableWidgetItems in the same way, I always get empty QTableWidgetItems in my window and none of the values seem to save. As a side note, the QTableWidget columns are variable thus why I have for loops iterating through them.

Here is my code regarding the saving process of the QTableWidget:

def init(self, ui_file, parent=None):

    self.numVes, self.numBif = FormVesselMain('vesselwindowmain.ui').savebutton()

    super(FormBeginningDiameter, self).__init__(parent)
    ui_file = QFile(ui_file)
    ui_file.open(QFile.ReadOnly)

    loader = QUiLoader()
    self.window = loader.load(ui_file)
    ui_file.close()

    self.window.findChild(QTableWidget, 'beginningdiameterinput').setColumnCount(self.numVes)

    saveBtn = self.window.findChild(QPushButton, 'savebutton')
    saveBtn.clicked.connect(self.savebutton)

    for i in range(self.numVes):
        self.window.findChild(QTableWidget, 'beginningdiameterinput').setItem(0, i, QTableWidgetItem(self.settings.value('beginningdiameter')[i]))

    for i in range(self.numVes):
        self.namesettings.append("dia"+str(i))

    self.savebutton

    return

def savebutton(self):
for i in range(self.numVes):
if self.window.findChild(QTableWidget, 'beginningdiameterinput').itemAt(0, i) is None:
print(self.namesettings[i])
self.settings.setValue(self.namesettings[i], 400)#self.namesettings[i], random.randint(48, 53))
self.settings.value(self.namesettings[i])
else:
self.settings.setValue(self.namesettings[i], self.window.findChild(QTableWidget, 'beginningdiameterinput').itemAt(0, i).text())

    for i in range(self.numVes):
        self.window.findChild(QTableWidget, 'beginningdiameterinput').setItem(0, i, QTableWidgetItem(self.settings.value(self.namesettings[i])))

SGaist

Hi,

Looks like you should take a look at beginWriteArray.

rahulr22

This post is deleted!

rahulr22

@SGaist Hi,
I looked into beginWriteArray and the difference is I don't have multiple keys to input into an array. Even if I write in an array for an object for a QSettings value, I still am unable to access it later on when I close the window and reopen it. I am having more of an issue with QTableWidgetItem tracking QSettings, I believe.

SGaist

You don't need multiple keys to build an array.

Note that your code is pretty convoluted to read.

If you want to store the content of that table widget, you should refactor that code to clearly access the data of that QTableWidget rather than calling findChild all the time.

rahulr22

@Denni-0 Sure. Please let me know if this is easier to read

        self.window.findChild(QTableWidget, 'beginningdiameterinput').setColumnCount(self.numVes)
        begDia = []
        for i in range(self.numVes):
            if self.window.findChild(QTableWidget, 'beginningdiameterinput').item(0, i) is None:
                begDia.append(random.uniform(48, 53))
            else:
                begDia.append(int(self.window.findChild(QTableWidget, 'beginningdiameterinput').itemAt(0, i).text()))
            self.settings.setValue("beginningdiameter", begDia)
        return self.settings.value("beginningdiameter")

        for i in range(self.numVes):
            self.window.findChild(QTableWidget, 'beginningdiameterinput').setItem(0, i, QTableWidgetItem(self.settings.value('beginningdiameter')[i]))