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Re: problems with passing structures around in gui widgets [message #40400 is a reply to message #40399]

Thu, 05 August 2004 13:14

Jeff Guerber
Messages: 41
Registered: July 2000

Member

On Thu, 5 Aug 2004, David Fanning wrote:

> M. Katz writes:
>
>> That's true unless the UVALUE is also a pointer. In which case you
>> don't have to "check it back" when you're done with the event handler.
>> I've found out the hard way that checking-out the state variable and
>> checking it back later can lead to some nasty conflicts when you have
>> event-driven code, multiple things going on at once, and significant
>> subroutines called from the event handler.
>
> Well, by making it a pointer I think you trade
> errors in logic for errors in syntax. :-)

Naah. You just always reference "(*info)" (including parentheses!)
instead of just "info". Everything else stays the same:

*info.data = BytArr(50, 100)
*(*info).data = BytArr(50, 100)

That's what I do. (Although instead of "info" I like to call it "statep"
(pointer to state).)

(Well, that's what I _used_ to do, until I learned how to do all this
in objects. Now it's just "self", and I don't have to check it in OR out.
Wooo!)

Jeff Guerber

* I don't speak for NASA or Raytheon! *

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[Message index]

		Re: problems with passing structures around in gui widgets By: David Fanning on Thu, 05 August 2004 13:53
		Re: problems with passing structures around in gui widgets By: Jeff Guerber on Thu, 05 August 2004 13:14
		Re: problems with passing structures around in gui widgets By: David Fanning on Thu, 05 August 2004 10:03
		Re: problems with passing structures around in gui widgets By: MKatz843 on Thu, 05 August 2004 09:56
		Re: problems with passing structures around in gui widgets By: soule on Thu, 05 August 2004 09:16
		Re: problems with passing structures around in gui widgets By: David Fanning on Thu, 05 August 2004 08:38
		Re: problems with passing structures around in gui widgets By: R.Bauer on Thu, 05 August 2004 06:30
		Re: problems with passing structures around in gui widgets By: David Fanning on Wed, 04 August 2004 13:11

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