PyQt：RuntimeError：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

如果我运行以下代码：

 ＃！/ usr / local / bin / python3 
 
从PyQt4.QtCore中导入sys 
导入*从PyQt4.QtGui中导入* 
导入* 
 
 
 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：

pre $ Traceback（最近调用最后一个）：
文件test.py ，第16行，在< lambda>
self.button2.clicked.connect（lambda：self.setCentralWidget（self.button1））
RuntimeError：QPushButton类型的包装C / C ++对象已被删除


我不明白为什么该对象被删除。窗口应该保持对它的引用。
我彻底调查了这些帖子：
了解底层C / C ++对象已被删除错误

可以通过查询PyQt4 QObject来确定底层C ++实例是否已被销毁？ b
$ b

为什么按钮被删除？

解决方案

这里：
Python PySide（内部c ++对象已经删除）

注意：QMainWindow获取窗口小部件指针的所有权，并在适当的时候删除它。

If I run this code:

    #!/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_())

...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

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?

Why is the button being deleted?

解决方案

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

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.

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

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