PyQt QThreadPool error

h0uk vardan.pogosyan at gmail.com
Fri Jan 8 00:07:10 CET 2010


On 8 янв, 03:02, Phil Thompson <p... at riverbankcomputing.com> wrote:
> On Thu, 7 Jan 2010 13:03:24 -0800 (PST), h0uk <vardan.pogos... at gmail.com>
> wrote:
>
> > On 8 янв, 01:02, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> >> h0uk schrieb:
>
> >> > Hello.
>
> >> > I have the following code:
>
> >> >             #workers = {}
> >> >             QtCore.QThreadPool.globalInstance().setExpiryTimeout
> >> > (300000)
> >> >            
> >> > QtCore.QThreadPool.globalInstance().setMaxThreadCount(1)
> >> >             for i in range(1, int(userscnt) + 1):
> >> >                 work = wk.Worker(i)
> >> >                 # connect signals
> >> >                
> >> > work.mmShowCaptcha.connect(self.show_captcha_dlg)
> >> >                 work.log.connect(self.handle_log)
> >> >                
> >> > self.captcha_answer.connect(work.mmCaptchaAnswer)
> >> >                 work.setAutoDelete(True)
> >> >                
>
> QtCore.QThreadPool.globalInstance().start(work)
>
>
>
>
>
> >> > On last line of code ( QtCore.QThreadPool.globalInstance().start
> >> > (work) ) i get an error:
>
> >> > SystemError: error return without exception set
>
> >> > What is wrong in my code??? Any advise???
>
> >> The error is on C-level. AFAIK it occurs when a Python-C-function
> >> returns "NULL" without setting an exception.
>
> >> It's hard to say where it really occurs. I'd use a debug-build of PyQt,
> >> and possibly Python, and then investigate using gdb.
>
> >> Alternatively, what happens when you do some "dummy"-work that doesn't
> >> use signals and no other libraries?
>
> >> Diez
>
> > About some "dummy" code:
>
> > #!/usr/bin/env python
> > # -*- coding: utf-8 -*-
>
> > import sys
> > import os
> > import time
>
> > from PyQt4 import QtCore, QtGui
>
> > class Job(QtCore.QRunnable):
> >    def __init__(self, name):
> >            QtCore.QRunnable.__init__(self)
> >            self._name = name
>
> >    def run(self):
> >            time.sleep(10)
> >            print self._name
>
> >    def autoDelete(self):
> >            return self._auto
>
> >    def setAutoDelete(self, auto):
> >            self._auto = auto
>
> > if __name__ == "__main__":
>
> >    app = QtGui.QApplication(sys.argv)
>
> >    QtCore.QThreadPool.globalInstance().setMaxThreadCount(1)
>
> >    j = Job("Job-1")
> >    j.setAutoDelete(True)
> >    QtCore.QThreadPool.globalInstance().start(j)
>
> > Even this code not work. On the last line of code
> > ( QtCore.QThreadPool.globalInstance().start(j) ) i get the error:
>
> >>> An unhandled win32 exception occured in python.exe
>
> You aren't letting the thread run before exiting the program. Try adding...
>
>     app.exec_()
>
> ...after you call start().
>
> Also, I'm not sure what you are trying to achieve with your implementations
> of autoDelete() and setAutoDelete().
>
> Phil

Phil you right about app.exec_(). But situation is sligthly different.

I want to have more than one Job. I add these Jobs into QThreadPool
trough cycle. And I also want these Jobs to run  sequentially.

The following code illustrate what I mean:

#!/usr/bin/env python
# -*- coding: utf-8 -*-

import sys
import os
import time

from PyQt4 import QtCore, QtGui

class Job(QtCore.QRunnable):
	def __init__(self, name):
		QtCore.QRunnable.__init__(self)
		self._name = name

	def run(self):
		time.sleep(3)
		print self._name


if __name__ == "__main__":

	app = QtGui.QApplication(sys.argv)

	QtCore.QThreadPool.globalInstance().setMaxThreadCount(1)

	for i in range(5):
		j = Job("Job-" + str(i))
		j.setAutoDelete(True)
		QtCore.QThreadPool.globalInstance().start(j, i)
	app.exec_()

After 5 cycle I get the same error:  An unhandled win32 exception
occured in python.exe.

How I can do it?? To run my Jobs sequentially???

Vardan.



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