我在PyQt5和python3.5中通过在QThread
中运行Worker
来实现多线程。在下面的示例中thread2_worker
(在一个辅助线程内运行)创建thread3_worker
,将thread3_worker.finished
信号连接到thread3_worker_finished()
并运行它。在
当thread3_worker
完成时,它从其线程中发出finished
,但连接不起作用。我的猜测是它与thread3_worker
的创建或连接有关,而不是在主线程中,但我欢迎任何澄清。在
import time
from PyQt5.QtCore import QObject, QThread, pyqtSignal, pyqtSlot, QCoreApplication
class Worker(QObject):
# Generic worker.
finished = pyqtSignal()
def __init__(self, func):
super().__init__()
self.func = func
def run(self):
self.func()
self.finished.emit()
def thread_factory(func):
# Creates a Worker, a QThread and moves the Worker inside the QThread.
worker = Worker(func)
thread = QThread()
worker.moveToThread(thread)
thread.started.connect(worker.run)
# Provision graceful termination.
worker.finished.connect(thread.quit)
worker.finished.connect(worker.deleteLater)
thread.finished.connect(thread.deleteLater)
return worker, thread
def wait():
print("thread3:\t{}".format(QThread.currentThread()))
time.sleep(3)
# finished signal of thread3_worker is never received.
@pyqtSlot()
def thread3_worker_finished():
QCoreApplication.exit()
def create_thread3():
print("thread2:\t{}".format(QThread.currentThread()))
global thread3_worker, thread3
# thread3_worker runs inside thread3, and all it does is call wait().
thread3_worker, thread3 = thread_factory(wait)
thread3_worker.finished.connect(thread3_worker_finished) # FIXME Doesn't work.
thread3.start()
app = QCoreApplication([])
print("Main thread:\t{}".format(QThread.currentThread()))
thread3_worker, thread3 = None, None
# thread2_worker runs inside thread2, and creates and runs thread3_worker.
thread2_worker, thread2 = thread_factory(create_thread3)
thread2.start()
app.exec_()
跨线程信号需要一个事件循环。您的
thread_factory
函数将工作线程的finished
信号连接到其线程的quit
槽。quit
槽要求线程退出其事件循环。在所以在thread3开始之后,worker2结束,thread2退出。然后,当发出worker3的
finished
信号时,就不再有一个事件循环在运行来处理它。如果您注释掉worker.finished.connect(thread.quit)
行,您的示例应该可以工作。在相关问题 更多 >
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