[visionegg] Re: Exiting a While Loop

Dear Jeff,
You might want to convert your code to the style defined in mouseTarget_user_loop.py -- no use of the VE FlowControl module. This means that the execution order of your program is 100% defined by you, so you understand what's going on. It's a little difficult to read between the lines and figure out what is going on with your code without an example, which you're welcome to email me directly if it's too big for this list. It's been a long time since I dealt with the ephysgui, but I think the cancel button works by setting the go_duration of the presentation instance to zero. 

-Andrew

Maher, Jeffrey wrote:

Andrew,
I see what you are talking about with the mouseTarget.py, but with my limited knowledge I have no idea how to implement it into the code that I have in front of me. I tried just using the code from there into mine, but that didn't have a very desirable outcome. I would love to be able to show you all the code, but it is far too long to put in an email. It seems as though the presentation class maybe isnt used for this? Is it possible to apply the callback into the while loop that I have so it will work? One of the things I've found thats weird is that p is never defined before hand, yet for some reason it still works in that code. When I attempt to define p up above to use the callback function it changes what is shown on the screen. One thing I did notice is that in your ephysgui you have a cancel button, but I can't for the life of me seem to find the code for it. Any chance you might be able to direct me to that? That appears to be my next alternative means of getting out of the while loop. -Jeff 

________________________________

From: visionegg-bounce@xxxxxxxxxxxxx on behalf of Andrew Straw
Sent: Tue 31-Jul-07 6:48 PM
To: visionegg@xxxxxxxxxxxxx
Subject: [visionegg] Re: Exiting a While Loop



Dear Jeff,

If you're not dealing with events in p.go(), they will very likely never
be seen by your code. Check the mouseTarget.py demo for an example of
setting up callbacks to deal with events within the go() loop.

Let us know if you're still stuck.

-Andrew

Maher, Jeffrey wrote:

Hello all,

Yes I know this is a repeat to my previous question, and I apologize for that.  
I have made some progress in the code, now I need is a slight bit of debugging 
and advice.

As a reminder, my problem is that I could not get the while loop to terminate 
prior to the set value being reached.

Previously I was not able to get the code for trapping a keypress into the 
while loop, and while now that I have, it seems unable to read the code and 
simply jumps over it to the other conditions of the while loop. In the code 
below, it appears as though the for loop is completely ignored.

If I try bumping the p.go and i=i+1 an indent over, I get random number of 
stimulus presentations, and the the keypress seeems to (MAYBE) make a 
difference. I have also tried using an else statement, but that seemed to reset 
the value of i and again produce a random number of time the stimulus is 
presented.

Heres the code:
i=0 
        while i!=eval(self.number.get()):
            for event in pygame.event.get():
                if event.type == pygame.locals.KEYDOWN:
                    if event.key == pygame.locals.K_UP:
                        i=self.number.get()
p.go() 
            i=i+1



Any suggestions would be much appreciated.

-Jeff


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