如何在PyQt5中生成dialog.exec接受信号

from PyQt5.QtWidgets import QApplication, QDialog, QPushButton, QLabel
from PyQt5.QtCore import pyqtSignal

class MyDialog(QDialog):
    # 定义一个信号
    my_signal = pyqtSignal()

    def __init__(self):
        super().__init__()

        self.setWindowTitle("My Dialog")
        self.setGeometry(100, 100, 300, 200)

        self.label = QLabel("Dialog Content", self)
        self.label.move(100, 50)

        self.button = QPushButton("Close", self)
        self.button.move(100, 100)
        self.button.clicked.connect(self.close_dialog)

    def close_dialog(self):
        # 发送信号
        self.my_signal.emit()
        self.close()

app = QApplication([])
dialog = MyDialog()

def handle_signal():
    print("Signal received")

dialog.my_signal.connect(handle_signal)

dialog.exec()
app.exec()