pythoncard-users

[Pythoncard-users] Execute menu item while processing

[hwphillips <bu...@ya...>]

I have written a program which involves a long process of copying 
files/converting files. I would like for the user to be able to stop the 
process. I put a "stop" menu item, but the program doesn't respond. The 
window titlebar goes white and nothing happens till the 
copying/converting process is over. Any assistance would be appreciated.

Re: [Pythoncard-users] Execute menu item while processing

[Bill B. <bil...@pe...>]

hwphillips wrote:
> I have written a program which involves a long process of copying 
> files/converting files. I would like for the user to be able to stop the 
> process. I put a "stop" menu item, but the program doesn't respond. The 
> window titlebar goes white and nothing happens till the 
> copying/converting process is over. Any assistance would be appreciated.
> 

Try putting a wx.SafeYield() or wx.Yield() inside of your long running 
loop and see if that helps.

HTH,

Bill

Re: [Pythoncard-users] Execute menu item while processing

[Alex T. <al...@tw...>]

hwphillips wrote:

>I have written a program which involves a long process of copying 
>files/converting files. I would like for the user to be able to stop the 
>process. I put a "stop" menu item, but the program doesn't respond. The 
>window titlebar goes white and nothing happens till the 
>copying/converting process is over. Any assistance would be appreciated.
>  
>
So long as your processing loop is running, there is no opportunity for 
the wxPython events to be processed and passed to your menu code.

Easiest, simplest, way to handle this is to ensure that your processing 
loop has something like

for file in theListOfFiles:   
     if globalStop: break
     processOneFile()
     wx.SafeYield(self)

This checks a global variable (which you would set to true when the 
"stop" button (or menu) was clicked), then processes one file, then 
yields control (which allows wx to process any events). 

There are a number of examples that do this in the PythonCard sample - 
see for instance gravity.py (or findfiles for "yield" in the samples 
directory).

-- 
Alex Tweedly       http://www.tweedly.net



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Re: [Pythoncard-users] Execute menu item while processing

[Steve F. <sf...@ih...>]

On Sat, 2006-07-22 at 09:42 -0400, hwphillips wrote:
> I have written a program which involves a long process of copying 
> files/converting files. I would like for the user to be able to stop the 
> process. I put a "stop" menu item, but the program doesn't respond. The 
> window titlebar goes white and nothing happens till the 
> copying/converting process is over. Any assistance would be appreciated.

Or if you're looking to pick up an awesome asynchronous toolkit, you
could use Twisted (http://www.twistedmatrix.com) to do that very simply.
(Very simply, that is, after you've had sufficient Kool-Ade, if you
will.)

I'm using Twisted together with Pythoncard and it's an absolutely killer
combo. Somebody with more experience than I should do a writeup on it;
that combination is the answer to a lot of developers' needs.

Steve

Re: [Pythoncard-users] Execute menu item while processing

[Alex T. <al...@tw...>]

No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.1.394 / Virus Database: 268.10.3/395 - Release Date: 21/07/2006