[PyQt] Another connect problem

[Jason H]

The C++ code uses new to create an object on the heap, which you must delete later
In python if nothing references the object, it is destroyed. So as soon as __init__ is done, job goes *poof*
You need to maintain a reference to it by using self.job = ... so that way the class keeps the job instance around.





----- Original Message ----
From: Thomas Olsen <tanghus at gmail.com>
To: pyqt at riverbankcomputing.com; Jason H <scorp1us at yahoo.com>
Sent: Thursday, October 1, 2009 2:46:48 PM
Subject: Re: [PyQt] Another connect problem

On Thursday 01 October 2009 20:22:00 Jason H wrote:
> job is not a member of the class (self.job) so it gets destroyed.
> 
So should it be:

    def job_recieved(self, data):
        print "Data recieved: " + data

I was looking at the example:

#include <kio/scheduler.h>
#include <kurl.h>
#include <kio/jobclasses.h>
#include <kdebug.h>
#include <browser.h>

class TransferJob;

Browser::Browser() : QWidget(NULL)
{
  slotButtonClicked();
}

void Browser::slotButtonClicked()
{
  kDebug() << "entering function";
  // creating a kioslave
  KIO::TransferJob *job = KIO::get(KUrl("http://www.kde.org"));
  connect (job, SIGNAL(  data(KIO::Job *, const QByteArray & )), this, 
SLOT(dataIsHere(KIO::Job *,const QByteArray &)));
}

void Browser::dataIsHere(KIO::Job *,const QByteArray & data )
{
  kDebug() << "data is here";
  kDebug() << data;
}

from 
http://techbase.kde.org/Development/Tutorials/KIO_Slaves/Using_KIO_Slaves_in_your_Program 
and there job is an argument to the slot..?

> 
> 
> ----- Original Message ----
> From: Thomas Olsen <tanghus at gmail.com>
> To: pyqt at riverbankcomputing.com
> Sent: Thursday, October 1, 2009 2:09:21 PM
> Subject: [PyQt] Another connect problem
> 
> Hi
> 
> This is actually PyKDE4 related but the list seems to be dead.
> 
> I am trying to connect a KIO.TransferJob[1] to a method in my class but
>  must be doing something wrong. A very stripped down version of my class
>  looks like this:
> 
> from PyKDE4.kdecore import *
> from PyKDE4.kio import *
> 
> class MyClass():
>   def __init__(self):
>     job = KIO.get(KUrl("http://somesite.com"))
>     QObject.connect(job, SIGNAL("data(Job*, const QByteArray&)"),
>         self.job_received)
> 
>   def job_received(self, job, data):
>     print "Data received: " + data
> 
> 
> But job_received is never called. I know I should be using the new-style
> connect but I haven't really grasped it yet...
> 
> [1] http://api.kde.org/pykde-4.3-api/kio/KIO.TransferJob.html
> 

-- 
Best Regards / Med venlig hilsen

  Thomas Olsen

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