PyQt:运行时错误:包装的 C/C++ 对象已被删除 [英] PyQt: RuntimeError: wrapped C/C++ object has been deleted

问题描述

如果我运行此代码:

    #!/usr/local/bin/    python3

import sys 
from PyQt4.QtCore import *
from PyQt4.QtGui import *


class Window(QMainWindow):

    def __init__(self):
        super().__init__()
        self.button1 = QPushButton("1")
        self.button2 = QPushButton("2")
        self.setCentralWidget(self.button1)
        self.button1.clicked.connect(lambda: self.setCentralWidget(self.button2))
        self.button2.clicked.connect(lambda: self.setCentralWidget(self.button1))
        self.show()

if __name__ == '__main__':

    import sys 
    app = QApplication(sys.argv)
    window = Window()
    sys.exit(app.exec_())

...我得到这个输出:

...I get this output:

Traceback (most recent call last):
  File "test.py", line 16, in <lambda>
    self.button2.clicked.connect(lambda: self.setCentralWidget(self.button1))
RuntimeError: wrapped C/C++ object of type QPushButton has been deleted

我不明白为什么要删除该对象.Window 应该维护对它的引用.我已经彻底调查了这些帖子:理解底层C/C++对象已被删除"错误是否可以查询 PyQt4 QObject 以确定底层 C++ 实例是否已销毁?

I do not understand why the object is being deleted. Window should maintain a reference to it. I have thoroughly investigated these posts: Understanding the "underlying C/C++ object has been deleted" error Can a PyQt4 QObject be queried to determine if the underlying C++ instance has been destroyed?

为什么按钮被删除了?

推荐答案

这个问题的答案可以在这里找到:Python PySide(内部 c++ 对象已删除)

This answer to this question is as found here: Python PySide (Internal c++ Object Already Deleted)

显然，使用 setCentralWidget 将一个小部件分配给 QMainWindow，然后使用 setCentralWidget 分配另一个小部件将导致底层的 c++ QWidget 被删除，即使我有一个保持对它的引用的对象.

Apparently, assigning one widget to QMainWindow using setCentralWidget and then assigning another widget with setCentralWidget will cause the underlying c++ QWidget to be deleted, even though I have an object that maintains reference to it.

注意:QMainWindow 取得控件指针的所有权并在适当的时候将其删除.

Note: QMainWindow takes ownership of the widget pointer and deletes it at the appropriate time.

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