Python-PyQt中带有QThread的后台线程

一尘不染

Python-PyQt中带有QThread的后台线程

python

我有一个程序，可以通过我在PyQt中编写的gui与正在使用的无线电接口。显然，无线电的主要功能之一是传输数据，但要连续进行，我必须循环写入，这会导致gui挂起。由于我从未处理过线程，因此我尝试使用QCoreApplication.processEvents().“无线电”需要在两次传输之间睡眠的方法来消除这些挂起，因此gui仍根据这些睡眠持续的时间来挂起。

是否有使用QThread修复此问题的简单方法？我一直在寻找有关如何使用PyQt实现多线程的教程，但是其中大多数都涉及设置服务器，并且比我需要的要先进得多。老实说，我什至不真正需要我的线程在它运行时更新任何东西，我只需要启动它，使其在后台传输，然后停止它即可。

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2020-02-17

共1个答案

一尘不染

我创建了一个小示例，展示了3种不同的简单线程处理方式。我希望它能帮助你找到解决问题的正确方法。

import sys
import time

from PyQt5.QtCore import (QCoreApplication, QObject, QRunnable, QThread,
                          QThreadPool, pyqtSignal)


# Subclassing QThread
# http://qt-project.org/doc/latest/qthread.html
class AThread(QThread):

    def run(self):
        count = 0
        while count < 5:
            time.sleep(1)
            print("A Increasing")
            count += 1

# Subclassing QObject and using moveToThread
# http://blog.qt.digia.com/blog/2007/07/05/qthreads-no-longer-abstract
class SomeObject(QObject):

    finished = pyqtSignal()

    def long_running(self):
        count = 0
        while count < 5:
            time.sleep(1)
            print("B Increasing")
            count += 1
        self.finished.emit()

# Using a QRunnable
# http://qt-project.org/doc/latest/qthreadpool.html
# Note that a QRunnable isn't a subclass of QObject and therefore does
# not provide signals and slots.
class Runnable(QRunnable):

    def run(self):
        count = 0
        app = QCoreApplication.instance()
        while count < 5:
            print("C Increasing")
            time.sleep(1)
            count += 1
        app.quit()


def using_q_thread():
    app = QCoreApplication([])
    thread = AThread()
    thread.finished.connect(app.exit)
    thread.start()
    sys.exit(app.exec_())

def using_move_to_thread():
    app = QCoreApplication([])
    objThread = QThread()
    obj = SomeObject()
    obj.moveToThread(objThread)
    obj.finished.connect(objThread.quit)
    objThread.started.connect(obj.long_running)
    objThread.finished.connect(app.exit)
    objThread.start()
    sys.exit(app.exec_())

def using_q_runnable():
    app = QCoreApplication([])
    runnable = Runnable()
    QThreadPool.globalInstance().start(runnable)
    sys.exit(app.exec_())

if __name__ == "__main__":
    #using_q_thread()
    #using_move_to_thread()
    using_q_runnable()

2020-02-17