[Tutor] Problems with Gauge Bar.

Olrik Lenstra o.lenstra at gmail.com
Sun Aug 10 16:21:16 CEST 2008

I'm probably asking for a lot here. But I don't think I understand this

This is the part I tried to get the Bar in. I actually got it in GUI wise.
>> But I had no idea to let it run the moment I clicked "Scan"
> OK, Normally you have to update the bar values from inside a
> loop on your Scan method. In practice you probably need to
> use a timer to relinquish control back to the GUI so that the
> Guage refreshes itself.  In pseudo code:

> def onScan(self):
>    self.myfile = open('foo.txt')
>    self.count = 0
>    self.setTimer(0.01, self.processLine)
> def processLine(self)
>   line = self.myfile.readline()
>   if line:
>       processLine(line)
>       self.count += 1
>       self.myGauge.setValue(count)
>       self.setTimer(0.01, self.processLine)
>   else:
>      self.myGuage.setValue(0)
> This also allows the user to use the GUI while the scan is running

Ok. So lets see if I got this right. In the onScan you define self.myfile to
open 'foo.txt' One thing I don't get here is what is foo.txt used for?
Then you set the count to 0
Then you set the timer to 0.01 with the event processLine?

then in the processLine you add 1 to the count with every line that is read?

 ## Define all the private IP ranges that we're not going to filter in
>> ## the ipconfig part of the program.
>> ## From private4 to private19 is actually 1 range. (Needs to be looked
>> at.)
>> ##------------------------------------------------------------------------------
>> private1 = r"192\.168\.\d+\.\d+"
>> private2 = r"169\.254\.\d+\.\d+"
>> private3 = r"10\.\d+\.\d+\.\d+"
>> ...
>> private19 = r"172\.31\.\d+\.\d+"
> Why not put them in a list or tuple called privates?
> It will save typing and:
>    lines = file('ipconfig.txt', "r+").readlines()
>>   for i in range(len(lines)):
>>       if re.search("IP\D+ \:", lines[i]):
>>           if not re.search(private1, lines[i]):
>>               if not re.search(private2, lines[i]):
>> ....
>>                    if not re.search(private19, lines[i]):
> The if not search lines could then be replaced by a loop.
> This has the added advantage that you can change the
> list of  privates(adding or deleting entries)) without
> changing this code.
>   lines = file('ipconfig.txt', "r+").readlines()
>   for i in range(len(lines)):
>       if re.search("IP\D+ \:", lines[i]):
>            for p in patterns:
>                if search(p,lines[i]):
>                    break
>            else:
>                # equivalent of the end of your chain
> Another approach would be to compbine all the private IP
> addresses into a single long regex. You can then do a
> single search for the pattern. This would be faster but
> slightly harder to read/debug.

I'll try to implement that loop  :)

Thanks for the help!
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