保存 class 包含 pyqt 对象的数据

Question

我正在构建一个 PyQt 应用程序，我是 python 的新手。假设我将一个 obj 项目存储在定义的 class:

中

class Item (self):
    def __init__(self, item_nbr, crop_pixmap, originepoint, designation):
        self.item_nbr = item_nbr            # integer
        self.crop_pixmap = crop_pixmap      # QPixmap
        self.origin_point = originpoint     # QPoint
        self.designation = designation      # str

然后我通过 GUI 执行其他操作并创建项目列表。如何保存此列表以便以后打开它？ pickle 不适用于 QPixmap，我想保存一个。

Answer 1

您可以使用 QSettings to save all your application data. It will automatically convert data types like QPixmap, QPoint, QColor, etc. By default, the settings are saved in a platform-independant way，但如果需要，您也可以保存到自定义位置。

这里是你如何 read/write 你的 Item class:

def settings(self):
    # use a custom location
    return QtCore.QSettings('app.conf', QtCore.QSettings.IniFormat)

def readSettings(self):
    self.items = []
    settings = self.settings()
    for index in range(settings.beginReadArray('items')):
        settings.setArrayIndex(index)
        self.items.append(Item(
            settings.value('number', -1, int),
            settings.value('pixmap', None, QtGui.QPixmap),
            settings.value('point', None, QtCore.QPoint),
            settings.value('designation', '', str),
            ))

def writeSettings(self):
    settings = self.settings()
    settings.beginWriteArray('items')
    for index, item in enumerate(self.items):
        settings.setArrayIndex(index)
        settings.setValue('number', item.item_nbr)
        settings.setValue('pixmap', item.crop_pixmap)
        settings.setValue('point', item.origin_point)
        settings.setValue('designation', item.designation)
    settings.endArray()

QSettings.value() 的 PyQt 版本允许您指定默认值和值的预期类型。

保存 class 包含 pyqt 对象的数据

Saving class data containing pyqt objects

python

pyqt

saving-data