[PySide] how to restart QProcess after it fails?

Zhao Lee redstone-cold at 163.com
Sat Jun 1 10:06:56 CEST 2019

You should reset  self.in_error=False in __retry_process to get __retry_process called again , as a good practice , I would get ride of self.in_error
and use 
if (process_state == QtCore.QProcess.NotRunning) and self.current_try < 5
instead .
If the above solution didn't work, maybe there is a bug with PySide, please give a try with PyQt5.


At 2019-06-01 15:26:49, "Frank Rueter | OHUfx" <frank at ohufx.com> wrote:
>Hi all,
>I am using QProcess to launch an external application. The main part 
>work without trouble, but I need to check for license errors and if one 
>occurred, I need would like to restart the existing process with all 
>it's environment settings and signal connections a certain number of times.
>I connect QProcess.readyReadStandardError to a slot that toggles an 
>attribute called self.in_error to True.
>I also connect QProcess.stateChanged to another slot which looks like this:
>     def __retry_process(self, process_state):
>         max_retries = 5
>         if (process_state == QtCore.QProcess.NotRunning) and self.in_error:
>             # process has finished in an error state, so try to run it 
>             self.current_try += 1
>             print 'retrying {}/{}'.format(self.current_try, max_retries)
>             self.process.start(self.process.program(), 
>This prints the line "retrying 1/5" but after that nothing happens. I 
>can't see any log output from self.process so if seems to simply not be 
>running the second time around.
>I thought this would recursively call self.process 5 times after failing 
>the first time, since self.process.stateChanged is still connected to 
>self__retry_process(), and the current_try attribute is on class level 
>where it gets incremented on every unsuccessful try.
>I am obviously wrong about that. Could someboy help me out please?
>PySide mailing list
>PySide at qt-project.org
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.qt-project.org/pipermail/pyside/attachments/20190601/b47f9aa8/attachment.html>

More information about the PySide mailing list