Great, thank you very much for this!

frank

On 10/23/2017 07:54 AM, Renaud Talon wrote:

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.

https://gitlab.com/talonrenaud/codeSharing/blob/master/urlImgLoader.py

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.

Take care,

Renaud

*_______________________________________________*

*Renaud Talon*

Pipeline / TD

*FuseFX*

14823 Califa Street

Los Angeles, CA 91411

Office:   818-237-5052

Mobile:  310-430-8834

*www.FuseFX.com <http://www.fusefx.com/>*

*From:*PySide [mailto:pyside-bounces+renaudtalon=fusefx....@qt-project.org] *On Behalf Of *Frank Rueter | OHUfx
*Sent:* Sunday, October 22, 2017 2:20 AM
*To:* pyside@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.

Cheers,
frank

On 10/22/2017 09:18 PM, Frank Rueter | OHUfx wrote:

    Hi,

    I am downloading a few images in a separate thread using QRunnable.
    To download I am just using urllib2.urlopen() like this:

    [...]
        def run(self):
            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()
            pixmap.loadFromData(imageData)
            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?

    Cheers,
    frank

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