PySide Error: "Internal C++ object [..] already deleted."; While recursive grab/create QObjects

Question

我在使用 PySide 及其内部清理过程时遇到了一些问题。似乎我的 PySide 对象在我真正使用它们之前就被删除了。下面的示例可能不是最好的示例，但它是最简单的示例，可以简单地重现相同的错误。唯一的区别是，在我使用的应用程序中，API 为我提供了一个 wrapInstance 函数来获取 QMainWindow（每次都有一个新 ID）。但是错误是一样的。

import sys
from PySide import QtGui


class AnyApplication(QtGui.QMainWindow):

    def __init__(self):
        super(AnyApplication, self).__init__()
        self.initUI()

    def initUI(self):
        self._menuBar = self.menuBar()
        for dummy in ["File","Edit","Help"]:
            self._menuBar.addMenu(dummy)
        self.setGeometry(300, 300, 250, 150)
        self.setWindowTitle('MenuTest')    

class MenuBar(object):

    def __init__(self, qMenuBar):
        self.menuBar = qMenuBar

    def AddMenu(self, name):
        result = self.GetMenu(name)
        if result: return result
        else:
            new = self.menuBar.addMenu(name)
            print "Created: ",name , new
            result = Menu(new, name)
        return result

    def GetMenu(self, name):
        print "\nSearch for: ",name
        for action in self.menuBar.actions():
            if action.text()==name:
                print "Found: ",name , action.menu().actions()
                return Menu( action.menu(), name)
        return None

class Menu(object):
    def __init__(self, menu=None, name=None):
        self.menu   = menu
        self.name   = name

    def AddMenu(self, name):
        # print "Name: ",name
        result = self.GetMenu(name)
        if result: return result
        else:
            new = self.menu.addMenu(name)
            print "Created: ",name , new
            result = Menu(new, name)
        return result

    def GetMenu(self, name):
        print "\nSearch for: ",name
        for action in self.menu.actions():
            if action.text()==name:
                print "Found: ",name , action.menu()
                return Menu(action.menu(), name)
        return None


if __name__ == '__main__':
    # Launch Application
    app = QtGui.QApplication(sys.argv)
    anyApp = AnyApplication()
    anyApp.show()


    # Access Application with API
    print "\n## 1st ####################"
    apiMenu = MenuBar(anyApp.menuBar()).AddMenu("API")
    anMenu  = apiMenu.AddMenu("Analyse")

    print "\n## 2nd ####################"
    apiMenu = MenuBar(anyApp.menuBar()).AddMenu("API")
    exMenu  = apiMenu.AddMenu("Execute")

    sys.exit(app.exec_())

结果：

## 1st ####################

Search for:  API
Created:  API <PySide.QtGui.QMenu object at 0x00000000031E7488>

Search for:  Analyse
Created:  Analyse <PySide.QtGui.QMenu object at 0x00000000031E7408>

## 2nd ####################

Search for:  API
Found:  API [<PySide.QtGui.QAction object at 0x00000000031E7588>]

Search for:  Execute
Traceback (most recent call last):
  File "C:/test/qtMenu.py", line 92, in <module>
    exMenu  = apiMenu.AddMenu("Execute")
  File "C:/test/qtMenu.py", line 61, in AddMenu
    result = self.GetMenu(name)
  File "C:/test/qtMenu.py", line 71, in GetMenu
    for action in self.menu.actions():
RuntimeError: Internal C++ object (PySide.QtGui.QMenu) already deleted.

如何摆脱 PySide 的清理过程？还是我必须以不同的方式定义 QObjects 才能让它们存活？

如果您将 PySide 导入更改为 from PyQt4 import QtGui，您会发现它可以与 PyQt 一起正常工作。

Answer 1

经过更多研究，我找到了答案 here。因此，如果对象创建是以 "pythonic" 方式完成的，PySide 不会过多关注对象的父级。最好的办法是用父对象定义对象，然后将对象添加到它的父对象中。

def AddMenu(self, name):
    result = self.GetMenu(name)
    return result if result else \
        Menu( self.menuBar.addMenu( QtGui.QMenu(title=name, parent=self.menuBar) ).menu(), name)

现在它像预期的那样工作，对象不会被放入垃圾回收中进行清理。 QT cObject 现在正在处理它的关系，而不是 PySide 并保持对象处于活动状态。但是如果这个特性能在PySide的下一次更新中实现就好了，因为现在的创建方式不是很"pythonic"

PySide Error: "Internal C++ object [..] already deleted."; While recursive grab/create QObjects

PySide Error: "Internal C++ object [..] already deleted."; While recursive grab/create QObjects

python

api

pyqt

pyside