def start(): global img, pre_pts while True: root = tk.Tk() root.withdraw() f_path = filedialog.askopenfilename() if f_path: img = cv.imread(f_path) break else: messagebox.showinfo("提示", "请选择文件！") 修改上述代码，使得打开本地文件夹不选文件或者关闭系统窗口后，使得下面的主界面窗口按钮仍能够触发start（）函数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): img1, img2, img3, img4, text1, text2 = start() 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() 另外start（）和Faceshow窗口不在同一个py文件

修改后的代码如下：

def start():
    global img, pre_pts
    root = tk.Tk()
    root.withdraw()
    f_path = filedialog.askopenfilename()
    if f_path:
        img = cv.imread(f_path)
        root.destroy()  # 关闭系统窗口
        return process_img(img)
    else:
        messagebox.showinfo("提示", "请选择文件！")
        root.destroy()  # 关闭系统窗口
        return None, None, None, None, None, None

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):
        resu = start()
        if resu:
            img1, img2, img3, img4, text1, text2 = resu
            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()

另外，需要将 `start()` 函数所在的文件导入到 `Faceshow` 所在的文件中，可以使用类似 `from 文件名 import start` 的语句。