Hi,
I've been trying to get a binary file uploaded to an FTP server using
QtNetwork.QFtp on Windows XP.
The area I seem to be having trouble with is getting the
dataTransferProgress signal to fire. The method comes in two forms, one
which accepts a QByteArray, which seemingly doesn't have the
dataTransferProgress signal, and the other which requires a QIODevice
which does.
I can manage to connect, authenticate and upload the file if I pass in
the QFile.ReadAll() method, but since that returns a QByteArray, I don't
get the lovely dataTransferProgress signal, which I want to use to tie
to a progress bar.
I looked into just passing the QFile into the put method since it
inherits QIODevice but that just causes the program to crash. So I
looked into the other children and QBuffer sounds like the right fit--
"The QBuffer class provides a QIODevice for a QByteArray". Since I
know the QFile.ReadAll() returns a QByteArray, I thought I may have
cracked the problem, but when I try:
buffer = QtCore.QBuffer()
buffer.open(QtCore.QIODevice.ReadWrite)
buffer.setData(f.readAll()) #f is a QFile object.
then pass that buffer object into the QFtp.put(buffer,"outName") the
program just crashes.
I'm sure I have a misunderstanding somewhere-- I can't find any Python
examples of dataTransferProgress or QFtp.put that show me the correct
usage, I've tried Google (and it's code search) and after a stint in the
IRC channel, they pointed me here. Attached is a minimal example (or as
close to it as I could manage). The commented out line 29 is the
working example, but doesn't fire the signal (and I'm assuming because
it's providing a QByteArray), line 28 should be handing the put method a
QIODevice, and perhaps it is, but it's causing the program to crash (
which I've learnt tends to indicate I'm doing something rather silly).
Any help would be most appreciated.
import sys
from PyQt4 import QtCore, QtGui, QtNetwork
from PyQt4.QtSql import *
class MainForm(QtGui.QMainWindow):
def __init__(self, parent=None):
QtGui.QWidget.__init__(self, parent)
self.on_goUpload_clicked()
def on_goUpload_clicked(self):
self.client = QtNetwork.QFtp()
self.connect(self.client,
QtCore.SIGNAL('stateChanged(int)'),self.updateStatus)
self.connect(self.client,
QtCore.SIGNAL('dataTransferProgress(int,int)'),self.updateProgress)
self.client.connectToHost('ftp.thefort.org')
self.client.login("ting","moomin")
def updateProgress(self, position, total):
print(str(position) + "::" + str(total))
def updateStatus(self,state):
print(state)
if state == 4:
f= QtCore.QFile("binaryFile")
f.open(QtCore.QIODevice.ReadOnly)
buffer = QtCore.QBuffer()
buffer.open(QtCore.QIODevice.ReadWrite)
buffer.setData(f.readAll())
self.client.put(buffer,"outname") ## Causes a crash
#self.client.put(f.readAll(),"outname") ## Uploads, but no
dataTransferProgress signal.
if __name__ == "__main__":
app = QtGui.QApplication(sys.argv)
myapp = MainForm()
myapp.show()
sys.exit(app.exec_())
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