logging and PyQt4

[Vinay Sajip]

On Mar 14, 7:40 am, Adrian Casey <m... at agcasey.com> wrote:
> I have a multi-threaded PyQt4 application which has both a GUI and command-
> line interface.  I am using Qt4's threading because from what I have read,
> it is more efficient than the native python threading module.  Also, given
> most users will probably use the GUI, it seemed to make sense.  
>
> I want a flexible, threadsafeloggingfacility for my application so I was
> thinking of using python'sloggingmodule.  I need a logger that can log to
> the GUI or a terminal depending on how the application is invoked.
>
> So, my question is -:
>
> Is it wise to use python'sloggingmodule in conjunction with Qt4 threads?  
> If not, what are my options apart from writing my ownloggingmodule?
>
> If it is OK, then I would like to know how to subclass theloggingclass so
> that instead of sending output to stdout (as in StreamHandler), it emits Qt4
> signals instead.
>
> Any help would be appreciated.
>
> Thank you.
> Adrian Casey.

Logging certainly works well with PyQt4 in multi-threaded
applications, though of course it's based on Python's threading API
rather than Qt's. To direct logging output to a GUI, it would be
appropriate to develop a Qt/PyQt-aware handler class (derived from
logging.Handler) to do the Qt interfacing.

Regards,

Vinay Sajip