[英]QThread: Destroyed while thread is still running in Python
I've got this part of code, which sometimes works and sometimes throws warning: 我有这部分代码,有时可以工作,有时会发出警告:
QThread: Destroyed while thread is still running
This part is in UiMainWindow class 这部分在UiMainWindow类中
obj_thread = QtCore.QThread()
def ok():
self.module_src_tree.setStyleSheet('background-color: #81F781')
obj_thread.quit()
def err():
self.module_src_tree.setStyleSheet('background-color: #F78181')
obj_thread.quit()
tmp = self.Temp(self, module_revision)
tmp.moveToThread(obj_thread)
tmp.finished.connect(ok)
tmp.error.connect(err)
obj_thread.started.connect(tmp.run)
obj_thread.start()
This is class in UiMainWindow class 这是UiMainWindow类中的类
class Temp(QtCore.QObject):
finished = QtCore.pyqtSignal()
error = QtCore.pyqtSignal()
def __init__(self, gui, module_revision):
QtCore.QObject.__init__(self)
self.gui = gui
self.module_revision = module_revision
def run(self):
try:
self.gui.dp.pack_module_source(self.gui.module_src_show_list, self.gui.module_src_pack_list,
path=str(self.gui.path_box.text()), revision=self.module_revision)
self.finished.emit()
except Exception as e:
self.error.emit()
raise e
What I am trying to do with this code - I want to zip some files without freezing main application. 我想用此代码做什么-我想压缩一些文件而不冻结主应用程序。 So I start new Thread which works in background. 所以我开始在后台工作的新线程。 But I need functionality that a Widget changes it's color after the zipping is done to green or to red if something went wrong. 但是我需要的功能是,在完成压缩后,小部件可以将其颜色更改为绿色或红色(如果出了问题)。
Maybe I am doing something wrong? 也许我做错了什么? Maybe that is not the way? 也许那不是办法吗?
Most probles I've got with changing color part. 我最常遇到的问题是要改变颜色。
Best Regards, 最好的祝福,
Marek 马雷克
@three_pineapples, seeems like it doesn't start at all sometimes. @three_pineapples,似乎好像有时根本没有开始。 But there is no error/warning right now. 但是现在没有错误/警告。
I have modified code to this: 我已经对此进行了修改:
class UiMainWindow(object):
# thread pool
thread_pool = [None, None, None, None]
This is before class constructor. 这是在类构造函数之前。 Temp class stays the same as above, and Thread calling part of code looks like this right now: Temp类保持与上面相同,并且Thread调用代码的一部分现在看起来像这样:
self.thread_pool[3] = None
self.thread_pool[3] = QtCore.QThread()
def ok():
self.module_src_tree.setStyleSheet('background-color: #81F781')
self.thread_pool[3].quit()
def err():
self.module_src_tree.setStyleSheet('background-color: #F78181')
self.thread_pool[3].quit()
tmp = self.Temp(self, module_revision)
tmp.moveToThread(self.thread_pool[3])
tmp.finished.connect(ok)
tmp.error.connect(err)
self.thread_pool[3].started.connect(tmp.run)
self.thread_pool[3].start()
This issue occurs when the thread is garbage collected by Python. 当线程被Python垃圾回收时,会发生此问题。
You need to save a reference to your QThread
so it is not garbage collected. 您需要保存对您的QThread
的引用,以便不会对其进行垃圾回收。 Just do self.obj_thread = QtCore.QThread()
只是做self.obj_thread = QtCore.QThread()
If there is the possibility that multiple QThread
s will exist at once, and you are storing the references in the same variable, then you probably need to store the objects in a list instead. 如果有可能同时存在多个QThread
,并且您将引用存储在同一变量中,那么您可能需要将对象存储在列表中。 However, you will need to clear out objects from the list (so they are garbage collected) when a given thread has finished so that you don't introduce a memory leak to your application. 但是,当给定线程完成时,您将需要从列表中清除对象(以便对它们进行垃圾收集),以免对应用程序造成内存泄漏。
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