单击按钮返回值 [英] Return value from button click

问题描述

我很努力地从单击PyQt中的按钮时调用的函数返回一个值.这就是我要为变量添加值的方式:

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)

整个功能如下:

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)) TypeError:connect()插槽参数应该是可调用的或信号的，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'

有人在想如何使其工作?

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click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])

也是您的

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

这篇关于单击按钮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！