Question

我在PySide及其内部清理过程中遇到了一些问题。在我真正使用它们之前，我的PySide对象似乎已被删除。以下示例可能不是最好的示例，但它是最简单的并且重现相同的错误。唯一的区别是，在我使用的应用程序中，API为我提供wrapInstance函数来获取QMainWindow（每次使用新ID）。但错误是一样的。

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？或者我是否必须以不同的方式定义QObject以使它们保持活力？

如果将PySide导入更改为from PyQt4 import QtGui，您将看到它与PyQt一起正常工作。

Answer 1

经过一番研究后，我找到了答案here。因此，如果对象创建是以“pythonic”方式完成的，那么PySide并没有过多地关注对象。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。

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)

现在它按预期工作，并且不会将对象放入垃圾回收集进行清理。 QT cObject现在正在处理它的关系，而不是PySide并保持对象的存活。但是如果这个功能将在PySide的下一次更新中实现，那将是很好的，因为现在创建它的方式不是非常“pythonic”

PySide错误：＆＃34;内部C ++对象[..]已被删除。＆＃34 ;;在递归时抓取/创建QObjects

1 个答案: