class Faceshow(QMainWindow, Ui_MainWindow): def init(self, parent=None): super(Faceshow, self).init(parent) self.setupUi(self) self.main_button.clicked.connect(self.show_resu) self.main_exit.clicked.connect(self.quit) self.form = None def show_resu(self): try: img1, img2, img3, img4, text1, text2 = start() except Exception as e: print(e) return img1 = ndarray_to_qpixmap(img1) img2 = ndarray_to_qpixmap(img2) img3 = ndarray_to_qpixmap(img3) img4 = ndarray_to_qpixmap(img4) self.form = RESUshow(img1, img2, img3, img4, text1, text2) self.form.pushButton.clicked.connect(self.form.save_img4) self.form.show() def quit(self): self.close() if name == 'main': hxz = QApplication(sys.argv) ui = Faceshow() ui.show() sys.exit((hxz.exec_())) 修改上述代码，使得start()函数出现异常后，刷新主界面并不影响槽函数的再次触发

您可以在show_resu函数中添加一个try-except语句，并在except语句中处理异常，例如显示一个错误消息框。同时，您可以将self.form设为None，以确保每次重新打开时都会创建新的RESUshow对象。

修改后的代码如下：

from PyQt5.QtWidgets import QMessageBox

class Faceshow(QMainWindow, Ui_MainWindow):
    def __init__(self, parent=None):
        super(Faceshow, self).__init__(parent)
        self.setupUi(self)
        self.main_button.clicked.connect(self.show_resu)
        self.main_exit.clicked.connect(self.quit)
        self.form = None

    def show_resu(self):
        try:
            img1, img2, img3, img4, text1, text2 = start()
        except Exception as e:
            print(e)
            QMessageBox.warning(self, 'Error', 'Failed to process images.')
            return

        img1 = ndarray_to_qpixmap(img1)
        img2 = ndarray_to_qpixmap(img2)
        img3 = ndarray_to_qpixmap(img3)
        img4 = ndarray_to_qpixmap(img4)

        if self.form:
            self.form.close()

        self.form = RESUshow(img1, img2, img3, img4, text1, text2)
        self.form.pushButton.clicked.connect(self.form.save_img4)
        self.form.show()

    def quit(self):
        self.close()

if __name__ == '__main__':
    hxz = QApplication(sys.argv)
    ui = Faceshow()
    ui.show()
    sys.exit(hxz.exec_())