PyQt5信号通讯错误

Question

我遇到以下问题需要您的帮助。 我有两个 Python 文件 Main.py 和 Module.py，它们需要使用 PyQt5 信号进行通信。代码如下：

Main.py

from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *

from MyGUI import main_window_GUI

from Modules import Module.py

class MainWindow(QMainWindow, main_window_GUI.Ui_main_window):
    def __init__(self):
        QMainWindow.__init__(self)
        main_window_GUI.Ui_main_window.__init__(self)
        self.setupUI(self)

        sub_win = QMdiSubWindow()
        sub_win.setWidget(Module.moduleWindow())
        self.mdi.addSubWindow(sub_win)

        # this part reports error saying:
        # 'PyQt5.QtCore.pyqtSignal' object has no attribute 'connect'
        Module.moduleWindow.my_signal.connect(self.do_something)

    def do_something(self):
        pass

Module.py

from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *

from MyGUI import module_window_GUI

class moduleWindow(QMainWindow, module_window_GUI.Ui_module_window):
    my_signal = pyqtSignal()
    def __init__(self):
        QMainWindow.__init__(self)
        module_window_GUI.Ui_module_window.__init__(self)
        self.setupUI(self)

        # the rest is not important

    # what is important is th following function
    def closeEvent(self, event):
        # when the user closes this subwindow signal needs to
        # be emitted so that the MainWindow class knows that
        # it's been closed.
        self.my_signal.emit()
        event.accept()

我们非常欢迎任何形式的帮助。提前致谢。

Answer 1

您需要连接来自moduleWindow 类实例的信号，而不是来自类本身：

from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *

from MyGUI import main_window_GUI

from Modules import Module

class MainWindow(QMainWindow, main_window_GUI.Ui_main_window):
    def __init__(self):
        QMainWindow.__init__(self)
        main_window_GUI.Ui_main_window.__init__(self)
        self.setupUI(self)

        sub_win = QMdiSubWindow()
        module_window = Module.moduleWindow()
        sub_win.setWidget(module_window)
        self.mdi.addSubWindow(sub_win)

        module_window.my_signal.connect(self.do_something)

    @pyqtSlot()
    def do_something(self):
        pass

我还建议使用 pyqtSlot 来装饰 do_something 方法，如 documentation 中所述