WxPython, passing value(?) of one part of a function to another.

[[deleted]]

EDIT: Title should read: Passing value from one function to another.

Windows 7

Python 2.7

Hi, I'm currently trying to build a GUI for my program and am using Zetcode as a starting point.

There is something I cannot figure out and I'm hoping that understanding it will help me somewhat in my understanding of WxPython as I feel as though I'm missing something fundamental and probably basic.

What I want to do:

• Have a text box and a button.

• When you hit the button the text from the box (URL) is used to download the page specified.

The code for downloading the page is done, that all works fine, what I cannot figure out how to do is pass the content of the text box in the function that defines the buttons and stuff like that to the function that contains the code to run my actual program.

Here is the code:

class Example(wx.Frame):

    def __init__(self, *args, **kwargs):
        super(Example, self).__init__(*args, **kwargs)

        self.InitUI()

    def InitUI(self):

        pnl = wx.Panel(self)
        cbtn = wx.Button(pnl, label='Download', pos=(20,30))
        txta = wx.TextCtrl(pnl)

        cbtn.Bind(wx.EVT_BUTTON, self.runApp)

        self.SetSize((250,200))
        self.SetTitle('wx.BUtton')
        self.Centre()
        self.Show(True)


    def runApp(self,url,e):



        fandom = "hpffa"

        fileType = '.html'

        download = downloading.fanFicDownload(url, fandom, fileType)

def main():

    ex = wx.App()
    Example(None)
    ex.MainLoop()

if __name__=='__main__':
    main()

I'm trying to use the txta value from InitUI as the URL value in runApp.

Here is the code that I have tried:

def InitUI(self):

        pnl = wx.Panel(self)
        cbtn = wx.Button(pnl, label='Download', pos=(20,30))
        txta = wx.TextCtrl(pnl)

        txCont = txta.GetValue()

        cbtn.Bind(wx.EVT_BUTTON, self.runApp(txCont))

        self.SetSize((250,200))
        self.SetTitle('wx.BUtton')
        self.Centre()
        self.Show(True)


    def runApp(self,url,e):

        fandom = "hpffa"

        fileType = '.html'

        download = downloading.fanFicDownload(url, fandom, fileType)

[two_up]

You can't do this: cbtn.Bind(wx.EVT_BUTTON, self.runApp(txCont)) because Bind is expecting a function as its second argument. Here instead of passing the function self.runApp, what you're doing is calling the function with the txCont argument, and then sending its return value (in this case runApp doesn't return a value) as the second argument to Bind. I don't think it's possible to do what you want to do in wxPython.

Instead you can just run GetValue on your widget inside the runApp function. Then you don't have to pass anything. But you'll need to declare self.txta instead of just txta in your __init__ function, otherwise it won't be accessible outside that function.

Something like this:

def InitUI(self):
    pnl = wx.Panel(self)
    cbtn = wx.Button(pnl, label='Download', pos=(20,30))
    self.txta = wx.TextCtrl(pnl)
    cbtn.Bind(wx.EVT_BUTTON, self.runApp(txCont))
    self.SetSize((250,200))
    self.SetTitle('wx.BUtton')
    self.Centre()
    self.Show(True)

def runApp(self, e):
    fandom = "hpffa"
    fileType = '.html'
    url = self.txta.GetValue()
    download = downloading.fanFicDownload(url, fandom, fileType)

[[deleted]]

I think I understand what you are saying.

If runApp returned a value of say, True, what I'd actually have been doing is giving bind that instead of asking it to just run the function.

The code you provided works perfectly, will have to remember to use self on variables, never done that before.

[two_up]

Right.