Command line and GUI tools : need a single threading solution

Adrian Casey news at
Tue Jan 11 03:25:48 EST 2005

Diez B. Roggisch wrote:

>> I'm thinking it may be possible to modify the command line tools to use
>> qt
>> threads instead of native python threads.  Is this the way to go?  Are
>> there other options?
> Why don't you use python threads in qt - I do so and so far it didn't make
> any troubles for me. And I would strongly advise against using qthreads
> with your commandline-tools, as these then would only run on machines
> where pyqt is installed - which opens a small part of "dependency hell"
> for your users.
I have a QThread which polls a queue object via queue.get().  The command
line tools spawn a number of threads each of which writes its output to
this queue using queue.put().  As soon as the gui gets something off the
queue, it creates a QCustomEvent and sets the data property with the data
read from the queue.  My application has a customEvent() method which reads
the data item from the customEvent and processes it accordingly.  

The odd thing is, I have a non-threaded version of the command line tools
which work 100% with the gui.  The multi-threaded version of the command
line tools all work OK at the console - just not with the gui.

I will try your suggestion and replace my QCustomEvent mechanism with a
plain python queue.

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