[PySide] sending data from urllib2.urlopen().read() via signal corrupts in receiver
renaudtalon at fusefx.com
Sun Oct 22 20:54:37 CEST 2017
Hi Frank !
I first attempted to re-create your issue but I didn’t have any problem on my end. ( using PySide2 + Python3)
That said when I tried the same thing using Python2 I had the same issue as you did. I made a few changes and here is an example I created for you which works for both Python 2 and 3.
When using Python 3 “urllib.urlopen” returns a “bytes” object which PySide2 has no problem emitting and receiving as such: receivedData = Signal(bytes)
With Python 2 though using “urllib2.urlopen” I can print the image data within the thread and when checking the type it says “str” (which is fine since “str” and “bytes” are the same from what I understand in Py2)
That said after emitting the imgData as a string when I print the imgData type received from the signal it says “Unicode” instead of string and no matter what encoding I set it to (ascii, utf-8, utf-16) I can no longer read/print the imageData.
I am not sure why, this could be a Py2 + PySide2 bug or issue ?
To get around the issue I converted the data to a BytesIO object using the “io” module, setup the signal to use a “BytesIO” type instead of a “str” and that seems to work fine: receivedData = Signal(io.BytesIO)
I am not sure if this is the most elegant way. I’m curious to know what you guys think about this.
Pipeline / TD
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From: PySide [mailto:pyside-bounces+renaudtalon=fusefx.com at qt-project.org] On Behalf Of Frank Rueter | OHUfx
Sent: Sunday, October 22, 2017 2:20 AM
To: pyside at qt-project.org
Subject: Re: [PySide] sending data from urllib2.urlopen().read() via signal corrupts in receiver
quick follow up:
I am now writing the files to a temp directory and only passing the respective path via the signal, but I'm still curious how I would do this without writing anything to disk.
On 10/22/2017 09:18 PM, Frank Rueter | OHUfx wrote:
I am downloading a few images in a separate thread using QRunnable.
To download I am just using urllib2.urlopen() like this:
imageData = urllib2.urlopen(self.url).read()
print 'emitted:', imageData
self.signals.receivedData.emit(imageData) # this signal is declared like this: QtCore.Signal(str)
However, the receiving slot is receiving nothing:
def setPixmap(self, imageData):
print 'received:', imageData
pixmap = QtGui.QPixmap()
self.data['pixmap'] = pixmap
I guess this is too naive an approach to download image data in a separate thread?!
How can I fix this please?
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