Question

每当我从另一个QtWebkit的方法返回QObject时，

QObject会出现段错误。

这是我能提出的最简单的测试用例（适用于PySide和PyQt4）：

#!/usr/bin/env python2

import sys

try:
  from PyQt4.QtCore import QObject, QVariant, pyqtProperty
  from PyQt4.QtGui import QApplication
  from PyQt4.QtWebKit import QWebView

  Property = pyqtProperty
except ImportError:
  from PySide.QtCore import QObject, Property
  from PySide.QtGui import QApplication
  from PySide.QtWebKit import QWebView

class TestObject(QObject):
  @Property(str)
  def property(self):
    return 'foo'

class TestObjectContainer(QObject):
  @Property(QObject)  # Swapping QObject with TestObject doesn't fix it
  def object(self):
    return TestObject()

if __name__ == '__main__':
  application = QApplication(sys.argv)

  browser = QWebView()
  frame = browser.page().mainFrame()

  frame.addToJavaScriptWindowObject('container', TestObjectContainer())
  frame.addToJavaScriptWindowObject('test_object', TestObject())

  browser.show()

  #frame.evaluateJavaScript('test_object.property')
  frame.evaluateJavaScript('container.object.property')

  sys.exit(application.exec_())

这是奇怪的部分：

test_object.property;       // This doesn't segfault
container.object.property;  // This does

有没有办法像这样返回QObject？我做错了什么，或者这是一个错误？

我最终在@HYRY's answer的帮助下创建了一个简单的包装类：

class WebkitQObject(QObject):
  def __init__(self):
    super(WebkitQObject, self).__init__()
    self.__cache__ = []

  def store(self, item):
    self.__cache__.append(item)

    return self.__cache__[-1]

现在，这段代码稍作修改：

class TestObjectContainer(WebkitQObject):
  @Property(QObject)
  def object(self):
    return self.store(TestObject())

Answer 1

您需要对QObject的Python引用才能使其保持活动状态。您可以通过更改代码来测试这一点，

class TestObjectContainer(QObject):
  @Property(QObject)
  def object(self):
    self.tmp = TestObject()
    return self.tmp

QtWebkit在传递QObject时会发生段错误

1 个答案: