why can't I change self.filename? - pyqt

Question

I created a simple server/client app using PyQt.But I got strange error:
here is my server side code:
#! /usr/bin/python
import sys
import socket
from PyQt4.QtCore import *
from PyQt4.QtGui import *
from PyQt4.QtNetwork import *
HOST = '127.0.0.1'
PORT = 9991
SIZEOF_UINT32 = 4
class Form(QDialog):
def __init__(self, parent=None):
super(Form, self).__init__(parent)
self.socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self.socket.bind((HOST, PORT))
self.socket.listen(5)
self.worker = Worker(self.socket)
self.connect(self.worker, SIGNAL("received"), self.updateUi)
self.connect(self.worker, SIGNAL("finished()"), self.updateUi)
self.connect(self.worker, SIGNAL("terminated()"), self.updateUi)
# Create widgets/layout
self.browser = QTextBrowser()
self.selectButton = QPushButton('Close server')
layout = QVBoxLayout()
layout.addWidget(self.browser)
layout.addWidget(self.selectButton)
self.setLayout(layout)
self.setWindowTitle("Server")
self.worker.start()
def updateUi(self, text):
self.browser.append(text)
class Worker(QThread):
def __init__(self,socket,parent = None):
super(Worker, self).__init__(parent)
self.socket = socket
self.dir = '/home/jacos/down/'
self.filename = '/home/jacos/down/hello'
def receiveFile(self):
self.conn, self.addr = self.socket.accept()
totalData = ''
while 1:
data = self.conn.recv(1024)
if not data: break
totalData += data
print totalData
if totalData.find('f') == 0:
name = totalData.strip()[1:]
self.filename = self.dir + name
print self.filename
else:
self.saveFile(totalData)
print self.filename
self.emit(SIGNAL("received"),QString("received a file"))
def saveFile(self,data):
f = open(self.filename,'wb')
print self.filename
f.write(data)
f.close()
self.conn.close()
def run(self):
while 1:
self.receiveFile()
app = QApplication(sys.argv)
form = Form()
form.show()
app.exec_()
When I run it,I got this:
Traceback (most recent call last):
File "/home/jacos/bin/tss.pyw", line 75, in run
self.receiveFile()
File "/home/jacos/bin/tss.pyw", line 61, in receiveFile
self.saveFile(totalData)
File "/home/jacos/bin/tss.pyw", line 66, in saveFile
f = open(self.filename,'wb')
TypeError: file() argument 1 must be encoded string without NULL bytes, not str
TypeError: updateUi() takes exactly 2 arguments (1 given)
The problem is all about self.filename.It seems I can't pass it with the correct value...
Here is my client side code:
#! /usr/bin/python
# -*- coding: utf8 -*-
import sys
import socket
from PyQt4.QtCore import *
from PyQt4.QtGui import *
from PyQt4.QtNetwork import *
HOST = '127.0.0.1'
PORT = 9991
SIZEOF_UINT32 = 4
class Form(QDialog):
def __init__(self, parent=None):
super(Form, self).__init__(parent)
# Create widgets/layout
self.browser = QTextBrowser()
self.selectButton = QPushButton('Send a File')
self.connectButton = QPushButton("Connect")
self.connectButton.setEnabled(True)
layout = QVBoxLayout()
layout.addWidget(self.browser)
layout.addWidget(self.selectButton)
layout.addWidget(self.connectButton)
self.setLayout(layout)
# Signals and slots for line edit and connect button
self.selectButton.clicked.connect(self.sendFileName)
self.connectButton.clicked.connect(self.connectToServer)
self.setWindowTitle("Client")
# Update GUI
def updateUi(self, text):
self.browser.append(text)
def sendFileName(self):
filename=QFileDialog.getOpenFileName(self, 'Open File', '.')
name = filename.split('/')[-1]
self.updateUi("Sent file name:" + name)
self.socket.sendall("f" + name)
self.socket.close()
self.connectToServer()
self.sendFile(filename,name)
def sendFile(self,filename,name):
self.socket.sendall(open(filename,'rb').read())
self.updateUi("Sent file:" + filename)
self.socket.close()
self.connectButton.setEnabled(True)
def connectToServer(self):
self.socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self.socket.connect((HOST, PORT))
self.connectButton.setEnabled(False)
self.updateUi("Connected")
app = QApplication(sys.argv)
form = Form()
form.show()
app.exec_()
Thanks for any help.

Answer 1

You probably have a NULL byte (\0 or \x00) in self.filename and as the error indicates, you can't open a file with the name containing NULL byte. Deal with them appropriately beforehand (eg: remove, replace, etc.).
As for the other error: You are connecting two signals (finished and terminated) to self.updateUi. And these signals doesn't have pass any arguments whereas self.updateUi expects an argument to be passed, namely text. I'm not sure what your goal is but you might consider adding a default argument for the text parameter in self.updateUi.