python - 是否可以查询 PyQt4 QObject 以确定底层 C++ 实例是否已被销毁？

Question

destroyed()可以为 QObject 捕获信号，但我想简单地测试 Python 对象是否仍然引用有效的 C++ Qt 对象。有直接这样做的方法吗？

Answer 1

如果您导入 sip 模块，您可以调用它的 .isdeleted 函数。

import sip
from PyQt4.QtCore import QObject

q = QObject()
sip.isdeleted(q)
False

sip.delete(q)
q
<PyQt4.QtCore.QObject object at 0x017CCA98>

q.isdeleted(q)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
RuntimeError: underlying C/C++ object has been deleted