`QObject.moveToThread` 在 PySide6 中不占用插槽

Question

我正在对线程应用程序进行故障排除，我注意到以下行为：在 PySide6 中，我想连接到插槽和非插槽方法，根据文档，这应该可以工作。然而它并没有按预期工作。我不确定这是一个错误还是我做错了什么？

• 在 PySide6 中，如果首先连接

  QObject

  ，然后将其移动到槽内的新线程中，则当通过信号（使用

  QObject

  ）调用时，

  QueuedConnection

  的槽将不会在新线程中执行，然而，那些“不是”槽的方法却可以。如果先移动物体，然后连接起来，就一切正常了。 在PyQt5中，情况相反。不是槽的方法不会跟随
QObject
• 进入新线程，但槽可以。我的理解是这是正确的，因为在 PyQt5 中，槽声明对于 QueuedConnection 的工作是必须的。
我构建了一个最小的应用程序来说明问题。按顺序单击按钮将

Dummy

对象移动到新线程中，然后尝试通过不同的机制调用带有按钮的

do_work

方法/

do_work_slot

插槽，并检查执行该方法的线程。

在 PyQt5 中从上到下依次单击按钮会给出日志：

MainThread:move_to_thread: object thread: Main Thread, execution thread: Main Thread
MainThread:do_work: object thread: new thread, execution thread: Main Thread
MainThread:do_work: object thread: new thread, execution thread: Main Thread
Dummy-1:do_work_slot: object thread: new thread, execution thread: new thread
Dummy-1:do_work_slot: object thread: new thread, execution thread: new thread

而在 PySide6 中则是：

MainThread:move_to_thread: object thread: Main Thread, execution thread: Main Thread
MainThread:do_work: object thread: new thread, execution thread: Main Thread
Dummy-1:do_work: object thread: new thread, execution thread: new thread
MainThread:do_work_slot: object thread: new thread, execution thread: Main Thread
Dummy-1:do_work_slot: object thread: new thread, execution thread: new thread

请注意，对象的线程关联对于两个包都是正确的。
我在 PySide6 上期望的行为是（我添加了额外的星星以突出显示相关位）

MainThread:move_to_thread: object thread: Main Thread, execution thread: Main Thread
MainThread:do_work: object thread: new thread, execution thread: Main Thread
Dummy-1:do_work: object thread: new thread, execution thread: **new thread**
**Dummy-1**:do_work_slot: object thread: new thread, execution thread: **new thread**
Dummy-1:do_work_slot: object thread: new thread, execution thread: new thread

我附上申请表。

import logging
import sys, os
os.environ["QT_API"] = "pyqt5" # ""PySide6"
from qtpy import QtCore, QtWidgets
logging.basicConfig(format="%(asctime)s:%(levelname)s:%(threadName)s:%(name)s: %(message)s", level=logging.DEBUG)

msg_template = "object thread: {thread1}, execution thread: {thread2}"
class Dummy(QtCore.QObject):
    sigMoveToThread = QtCore.Signal()
    sigMoveToMain = QtCore.Signal()
    sigRequestWork = QtCore.Signal()

    def __init__(self, parent=None):
        QtCore.QObject.__init__(self, parent=parent)
        self.sigMoveToThread.connect(self.move_to_thread)
        self.sigMoveToMain.connect(self.move_to_main)
        self.sigRequestWork.connect(self.do_work_slot)

    def do_work(self):
        logging.info(msg_template.format(
            thread1=self.thread().objectName(),
            thread2=QtCore.QThread.currentThread().objectName()
        ))

    @QtCore.Slot()
    def do_work_slot(self):
        logging.info(msg_template.format(
            thread1=self.thread().objectName(),
            thread2=QtCore.QThread.currentThread().objectName()
        ))

    @QtCore.Slot()
    def move_to_thread(self):
        logging.info(msg_template.format(
            thread1=self.thread().objectName(),
            thread2=QtCore.QThread.currentThread().objectName()
        ))
        new_thread = QtCore.QThread()
        new_thread.setObjectName("new thread")
        self.moveToThread(new_thread)
        new_thread.start()
        self.t = new_thread # to avoid garbage collector


if __name__ == "__main__":
    app = QtWidgets.QApplication(sys.argv)
    window = QtWidgets.QMainWindow()
    widget = QtWidgets.QWidget()
    layout = QtWidgets.QVBoxLayout()

    QtCore.QThread.currentThread().setObjectName("Main Thread")
    dummy = Dummy()
    # moving to thread at THIS stage as below would result in correct moving
    # of both Slot and non-Slot connection in PySide6
    # thread = QtCore.QThread()
    # dummy.moveToThread(thread)

    button = QtWidgets.QPushButton("Click (Direct connection, not slot)")
    button.clicked.connect(dummy.do_work, QtCore.Qt.DirectConnection)
    layout.addWidget(button)

    button = QtWidgets.QPushButton("Click (Queued connection, not slot)")
    button.clicked.connect(dummy.do_work, QtCore.Qt.QueuedConnection)
    layout.addWidget(button)

    button = QtWidgets.QPushButton("Click (Queued connection, slot)")
    button.clicked.connect(dummy.do_work_slot, QtCore.Qt.QueuedConnection)
    layout.addWidget(button)

    button = QtWidgets.QPushButton("Click (sigRequestWork)")
    button.clicked.connect(dummy.sigRequestWork.emit)
    layout.addWidget(button)

    button = QtWidgets.QPushButton("Move to thread (move_to_thread slot)")
    button.clicked.connect(dummy.move_to_thread, QtCore.Qt.QueuedConnection)
    layout.addWidget(button)

    button = QtWidgets.QPushButton("Move to thread (sigMoveToThread)")
    button.clicked.connect(dummy.sigMoveToThread.emit, QtCore.Qt.QueuedConnection)
    layout.addWidget(button)

    widget.setLayout(layout)
    window.setCentralWidget(widget)
    window.show()
    sys.exit(app.exec())

Answer 1

PySide6-6.6.1

升级到

PySide-6.7.1

有帮助。 我也签入了

PyQt6-6.7.1

，它按预期工作。