按钮点击返回值 [英] Return value from button click

问题描述

当我在 PyQt 中单击按钮时，我很难从函数中返回一个值.这就是我想为变量赋值的方式:

I struggled with returning a value from function which is invoked when I click button in PyQt. That's how I'd like to put a value to the variable:

file_path = self.Button_open.clicked.connect(self.OpenTextFile)

整个函数看起来像这样:

Whole function looks like this:

def OpenTextFile(self):
    dialog = QtGui.QFileDialog()
    dialog.setWindowTitle("Choose a file to open")
    dialog.setFileMode(QtGui.QFileDialog.ExistingFile)
    dialog.setNameFilter("Text (*.txt);; All files (*.*)")
    dialog.setViewMode(QtGui.QFileDialog.Detail)

    filename = QtCore.QStringList()

    if(dialog.exec_()):
        file_name = dialog.selectedFiles()
    plain_text = open(file_name[0]).read()
    self.Editor.setPlainText(plain_text)
    return str(file_name[0])

现在，当我想将 file_path 传递给另一个函数时，python 解释器说

Now, when I want to pass the file_path to the other function, python interpreter says

self.Button_save.clicked.connect(self.SaveTextFile(file_path))类型错误:connect() 槽参数应该是可调用的或信号，而不是NoneType"

self.Button_save.clicked.connect(self.SaveTextFile(file_path)) TypeError: connect() slot argument should be a callable or a signal, not 'NoneType'

任何想法如何使它工作?

Any thoughts how to make it work ?

推荐答案

将 file_path 存储在类级别变量中，并在按钮单击方法中更新该值.

Store the file_path in a class level variable and update that value in your button click method.

self.file_path = None
self.Button_open.clicked.connect(self.OpenTextFile)

然后，

def OpenTextFile(self):
    dialog = QtGui.QFileDialog()
    dialog.setWindowTitle("Choose a file to open")
    dialog.setFileMode(QtGui.QFileDialog.ExistingFile)
    dialog.setNameFilter("Text (*.txt);; All files (*.*)")
    dialog.setViewMode(QtGui.QFileDialog.Detail)

    filename = QtCore.QStringList()

    if(dialog.exec_()):
        file_name = dialog.selectedFiles()
    plain_text = open(file_name[0]).read()
    self.Editor.setPlainText(plain_text)
    self.file_path = str(file_name[0])

还有你的

self.Button_save.clicked.connect(self.SaveTextFile(file_path))

应该是

self.Button_save.clicked.connect(self.SaveTextFile)

并在您的保存点击方法中

and in your save click method

def SaveTextFile(self):
    save(self.file_path)     # Your code to save file

这篇关于按钮点击返回值的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！