PySide插槽未在对象的线程中运行

• 将任务封装在 QObject 子类,其中工作在 run() finished 完成后发出信号。
• QThread 并使用 QObject.moveToThread() .
• start 向任务的 方法
• QThread.start() .

然而,我遇到了一个奇怪的问题,如果 方法包装在一个槽中,函数将在主线程中运行,而不是在对象所属的线程中运行。如果我把它作为标准Python方法,一切都很好。

下面是我创建的一个简单示例:

#!/usr/bin/env python

import sys

from PySide import QtCore, QtGui


class Task(QtCore.QObject):
    """Does some work and emits a signal when done."""

    finished = QtCore.Signal(object)

    def run1(self):
        """Runs task and emits finished() signal when done."""
        try:
            # Try running the task
            result = self._run()

        except:
            self.finished.emit(None)

        else:
            self.finished.emit(result)

    @QtCore.Slot()
    def run2(self):
        """Same as run1, but wrapped in a slot."""
        self.run1()

    def _run(self):
        """Override in subclass"""
        pass


class TestTask(Task):
    """Prints thread ID."""

    def __init__(self, name):
        super().__init__()
        self.name = name

    def _run(self):
        print('{} thread ID:'.format(self.name), QtCore.QThread.currentThreadId())
        return 'success'


def main():

    gui = QtGui.QApplication([])

    print('Main thread ID: ', QtCore.QThread.currentThreadId())

    # thread1 calls task1.run1()
    task1 = TestTask('task1')
    task1.finished.connect(lambda r: print('Task 1 finished:', r))

    thread1 = QtCore.QThread()
    task1.moveToThread(thread1)

    thread1.started.connect(task1.run1)

    # thread2 calls task2.run2()
    task2 = TestTask('task2')
    task1.finished.connect(lambda r: print('Task 2 finished:', r))

    thread2 = QtCore.QThread()
    task2.moveToThread(thread2)

    thread2.started.connect(task2.run2)

    # Start both threads
    thread1.start()
    thread2.start()

    # Run event loop (doesn't actually return)
    sys.exit(gui.exec_())


if __name__ == '__main__':
    main()

这将产生以下输出:

Main thread ID:  139962303178496
task1 thread ID: 139961642776320
task2 thread ID: 139962303178496
Task 2 finished success
Task 1 finished success

作为一种标准的Python方法,但我想知道为什么会发生这种情况。这是QT4.8和PySide 1.2.4。