单击按钮时如何从另一个 Python 文件读取 QLineEdit 值的值 [英] How to read value of QLineEdit value from another Python file when Push Button is clicked

问题描述

当单击按钮时，我试图从另一个 python 文件中读取 QLineEdit(在 prog 中的 search_dir_te)的值.但它正在失败.请指导.

Am trying to read the value of a QLineEdit (search_dir_te in prog) from another python file when push button is clicked. But it is failing. Please guide.

First.py:

class Display(QWidget): 

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

    def initUI(self):
        search_dir_label = QLabel('Directory to Search')
        self.search_dir_te = QLineEdit()
        search_dir_layout = QHBoxLayout(self)
        search_dir_layout.addWidget(search_dir_label)
        search_dir_layout.addWidget(self.search_dir_te)
        vert_layout1.addLayout(search_dir_layout)

        search_button = QPushButton('Search')
        search_button.clicked.connect(initiatesearch)   
        cancel_button = QPushButton('Cancel')
        search_cancel_layout = QHBoxLayout(self)
        search_cancel_layout.addWidget(search_button)
        search_cancel_layout.addWidget(cancel_button)
        search_cancel_layout.setAlignment(Qt.AlignCenter)
        vert_layout1.addLayout(search_cancel_layout)

<小时>

Second.py

    def initiatesearch(self):
        print(self.search_dir_te.text())

我在First.py中导入了initialsearch函数

I have imported initiatesearch function in First.py

推荐答案

您将应用程序的各个部分不必要地交织在一起，这是设计不佳的标志.函数就像一个黑匣子:接收信息，处理它并返回结果.在这种情况下，initiatesearch"应该只获取文本，而不是小部件或其他元素:

You are unnecessarily intertwining the parts of your application, and that is a sign of a bad design. A function is like a black box: Receive information, process it and return results. In this case "initiatesearch" you should only get the text and not the widget or other elements:

def initiatesearch(text):
    print(text)

class Display(QWidget): 
    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self):
        search_dir_label = QLabel('Directory to Search')
        self.search_dir_te = QLineEdit()
        search_dir_layout = QHBoxLayout(self)
        search_dir_layout.addWidget(search_dir_label)
        search_dir_layout.addWidget(self.search_dir_te)
        vert_layout1.addLayout(search_dir_layout)

        search_button = QPushButton('Search')
        search_button.clicked.connect(self.onClicked)   
        cancel_button = QPushButton('Cancel')
        search_cancel_layout = QHBoxLayout(self)
        search_cancel_layout.addWidget(search_button)
        search_cancel_layout.addWidget(cancel_button)
        search_cancel_layout.setAlignment(Qt.AlignCenter)
        vert_layout1.addLayout(search_cancel_layout)

    def onClicked(self):
        initiatesearch(self.search_dir_te.text())

更新:

如果您仍然想知道这是一种不好的做法，那么您可以执行以下操作:

If you still want to do knowing that it is a bad practice then you can do the following:

def onClicked(self):
    initiatesearch(self)

def initiatesearch(ui):
    print(ui.search_dir_te.text())

更新 2:

from functools import partial
# ...
search_button.clicked.connect(partial(initiatesearch, self))

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