En Wed, 11 Feb 2009 16:32:41 -0200, <mark.sea...@gmail.com> escribió:
On Feb 11, 9:01 am, mark.sea...@gmail.com wrote:
On Feb 10, 9:52 pm, "Gabriel Genellina" <gagsl-...@yahoo.com.ar>
wrote:
> En Wed, 11 Feb 2009 00:31:26 -0200, <mark.sea...@gmail.com> escribió:
> > I like the ability to access elements of a struct such as with > >
ctypes
> > Structure:
> > What I don't like about it is that it's not iterable:
> > I don't want to force the end user to have preknowledge of the > >
element
> > names.
[recipe using _fields_]
Thanks very much, Gabriel. This is very good start for me.
This works for predefined class. How about a situation where the
fields are added dynamically (as from reading in from an xml file).
I tinkered with it and think I have viable solution.
I need to append a new member to _fields_ before writing it,
then it seems to work.
p._fields_.append(('z', c_int))
point.z = 30
print 'List:', list(p)
List: [10, 20, 30]
Yes, that's the way to add a new field -- but you have to do that before
creating the first instance. Anywy, this is somewhat strange for a ctypes
Structure. Usually its memory layout is fixed and mandated by the
library/format/whatever you're trying to bind to.
You are not using it as a generic attribute container, are you? There are
better alternatives in that case.
--
Gabriel Genellina
--
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