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CHAPTER 28 ■ PROJECT 9: FILE SHARING II—NOW WITH GUI! 519 Listing 28-1. A Simple GUI Client (simple_guiclient.py) from xmlrpclib import ServerProxy, Fault from server import Node, UNHANDLED from client import randomString from threading import Thread from time import sleep from os import listdir import sys import wx HEAD_START = 0.1 # Seconds SECRET_LENGTH = 100 class Client(wx.App): """ The main client class, which takes care of setting up the GUI and starts a Node for serving files. """ def __init__(self, url, dirname, urlfile): """ Creates a random secret, instantiates a Node with that secret, starts a Thread with the Node's _start method (making sure the Thread is a daemon so it will quit when the application quits), reads all the URLs from the URL file and introduces the Node to them. """ super(Client, self).__init__() self.secret = randomString(SECRET_LENGTH) n = Node(url, dirname, self.secret) t = Thread(target=n._start) t.setDaemon(1) t.start() # Give the server a head start: sleep(HEAD_START) self.server = ServerProxy(url) for line in open(urlfile): line = line.strip() self.server.hello(line)
520 CHAPTER 28 ■ PROJECT 9: FILE SHARING II—NOW WITH GUI! def OnInit(self): """ Sets up the GUI. Creates a window, a text field, and a button, and lays them out. Binds the submit button to self.fetchHandler. """ win = wx.Frame(None, title="File Sharing Client", size=(400, 45)) bkg = wx.Panel(win) self.input = input = wx.TextCtrl(bkg); submit = wx.Button(bkg, label="Fetch", size=(80, 25)) submit.Bind(wx.EVT_BUTTON, self.fetchHandler) hbox = wx.BoxSizer() hbox.Add(input, proportion=1, flag=wx.ALL | wx.EXPAND, border=10) hbox.Add(submit, flag=wx.TOP | wx.BOTTOM | wx.RIGHT, border=10) vbox = wx.BoxSizer(wx.VERTICAL) vbox.Add(hbox, proportion=0, flag=wx.EXPAND) bkg.SetSizer(vbox) win.Show() return True def fetchHandler(self, event): """ Called when the user clicks the 'Fetch' button. Reads the query from the text field, and calls the fetch method of the server Node. If the query is not handled, an error message is printed. """ query = self.input.GetValue() try: self.server.fetch(query, self.secret) except Fault, f: if f.faultCode != UNHANDLED: raise print "Couldn't find the file", query
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Beginning Python From Novice to Pro
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For Ranveig
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Introduction A C program is like a
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256 CHAPTER 11 ■ FILES AND STUFF
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572 APPENDIX C ■ ONLINE RESOURCES
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Index ■Symbols - operator 558 !=
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