QThread发出了结束信号,当线程结束(连接到方法/函数)时,我可以执行某些操作,但是我也想使用QRunnable来执行此操作。完成后,有没有办法将QRunnable线程连接到方法/函数?
QThread:
class HelloWorldTask(QThread):
def __init__(self):
QThread.__init__(self)
def run(self):
import time
time.sleep(3)
print ("Running thread \n")
time.sleep(3)
hello.finished.connect(check)
def check():
print('Thread Done')
输出:
运行线程
完了
QRunnable:
instance = QThreadPool.globalInstance()
class HelloWorldTask(QRunnable):
def __init__(self):
super().__init__(self)
def run(self):
import time
time.sleep(3)
print ("Running thread \n")
time.sleep(3)
hello = HelloWorldTask()
#hello.finished.connect(check) <-- how to connect to a method/function when finished.
instance.start(hello)
print(instance.waitForDone())
def check():
print('Thread Done')
所需的输出:
运行线程
线程完成
最佳答案
QRunnable没有完成的信号,因为它不是QObject,所以可能的解决方案是创建另一个继承自QObject的类,以便它发出信号:
from PyQt5 import QtCore
class Signals(QtCore.QObject):
finished = QtCore.pyqtSignal()
class HelloWorldTask(QtCore.QRunnable):
def __init__(self):
super().__init__()
self.signal = Signals()
def run(self):
import time
time.sleep(3)
print("Running thread \n")
time.sleep(3)
self.signal.finished.emit()
def check():
print("Thread Done")
QtCore.QCoreApplication.quit()
if __name__ == "__main__":
import sys
app = QtCore.QCoreApplication(sys.argv)
hello = HelloWorldTask()
hello.signal.finished.connect(check)
QtCore.QThreadPool.globalInstance().start(hello)
sys.exit(app.exec_())