在PyQt中使用QThread的后台线程

Question

在PyQt中使用QThread的后台线程

我有一个程序，通过我用PyQt编写的GUI与我正在使用的收音机接口。显然，无线电的主要功能之一是传输数据，但是要连续地传输数据，我必须循环写，这会导致gui挂起。因为我从来没有处理过线程，所以我尝试用QCoreApplication.processEvents().然而，收音机需要在传输之间睡觉，所以根据这些睡眠时间的长短，Gui仍然挂着。

是否有一种使用QThread修复此问题的简单方法？我一直在寻找如何用PyQt实现多线程的教程，但大多数教程都涉及服务器的设置，而且比我所需要的要先进得多。老实说，我甚至不需要我的线程来更新运行中的任何东西，我只需要启动它，让它在后台传输，并停止它。

Answer 1

来自Matt的一个非常好的例子，我修复了错误，而且pyqt4.8现在也很常见，所以我也删除了虚拟类，并为dataReady信号添加了一个示例# -*- coding: utf-8 -*-import sysfrom PyQt4 import QtCore, QtGuifrom PyQt4.QtCore import Qt# very testable class (hint: you can use mock.Mock for the signals)class Worker(QtCore.QObject):    finished = QtCore.pyqtSignal()    dataReady = QtCore.pyqtSignal(list, dict)    @QtCore.pyqtSlot()    def processA(self):        print "Worker.processA()"        self.finished.emit()    @QtCore.pyqtSlot(str, list, list)    def processB(self, foo, bar=None, baz=None):        print "Worker.processB()"        for thing in bar:            # lots of processing...            self.dataReady.emit(['dummy', 'data'], {'dummy': ['data']})        self.finished.emit()def onDataReady(aList, aDict):    print 'onDataReady'    print repr(aList)    print repr(aDict)app = QtGui.QApplication(sys.argv)thread = QtCore.QThread()  # no parent!obj = Worker()  # no parent!obj.dataReady.connect(onDataReady)obj.moveToThread(thread)# if you want the thread to stop after the worker is done# you can always call thread.start() again laterobj.finished.connect(thread.quit)# one way to do it is to start processing as soon as the thread starts# this is okay in some cases... but makes it harder to send data to# the worker object from the main gui thread.  As you can see I'm calling# processA() which takes no argumentsthread.started.connect(obj.processA)thread.finished.connect(app.exit)thread.start()# another way to do it, which is a bit fancier, allows you to talk back and# forth with the object in a thread safe way by communicating through signals# and slots (now that the thread is running I can start calling methods on# the worker object)QtCore.QMetaObject.invokeMethod(obj, 'processB', Qt.QueuedConnection,                                QtCore.Q_ARG(str, "Hello World!"),                                QtCore.Q_ARG(list, ["args", 0, 1]),                                QtCore.Q_ARG(list, []))# that looks a bit scary, but its a totally ok thing to do in Qt,# we're simply using the system that Signals and Slots are built on top of,# the QMetaObject, to make it act like we safely emitted a signal for# the worker thread to pick up when its event loop resumes (so if its doing# a bunch of work you can call this method 10 times and it will just queue# up the calls.  Note: PyQt > 4.6 will not allow you to pass in a None# instead of an empty list, it has stricter type checkingapp.exec_()分享