python - QThread 信号发射两次

Question

创建了一个 Qthread 来处理我的应用程序的版本检查。线程工作完美，只是它发出了两次完成信号。

class myThread(QtCore.QThread):

    def run(self):
        print("Im running.")
        self.finished.emit()

    def stop(self):
        self.terminate()

class myApp(QtWidgets.QMainWindow, Ui_App):

    def __init__(self, parent=None):
        super(myApp, self).__init__()

        self.myThread = myThread()
        self.myThread.start()

        self.myThread.finished.connect(self.allDone)

    def allDone(self):
        print('Thread is done')

如何防止信号发射两次？

Answer 1

您的类myThread继承自QtCore.QThread，它已经具有finished信号，所以我假设问题是您的(多余的)行self.finished.emit().

这些看起来可能有帮助:

关于这样:

• Background thread with QThread in PyQt

文档:

• http://pyqt.sourceforge.net/Docs/PyQt5/api/QtCore/qthread.html#PyQt5-QtCore-QThread
  • https://doc.qt.io/qt-5/qthread.html#finished

PySide Qt 绑定(bind)文档:

• https://pyside.github.io/docs/pyside/PySide/QtCore/QThread.html#PySide.QtCore.PySide.QtCore.QThread.finished