Re: [Vala] Getting corrupted results when returning array of strings

[Dennis Möhlmann <in dev nyda info>]

Thanks, but no luck. The application dies before the "root-scope" is
left, so there is no parent yet and the if-block that would cause the
parent recursion isn't entered.

Anyway, I've removed every weak/un/owned keyword from the code to start
from the beginning. Since I only use GObject based classes, strings and
arrays of strings, shouldn't the worst case scenario be that I end up
with circular references that don't get freed? Instead the TreeNode's
add method now adds "empty" nodes (invalid string references I suppose).

I've made the generic TreeNode's add-method virtual and overrode it in
Variable so that I can print out the values. Now however, the Node
actually stores the values properly (for a while). Why? All I did was
copy and paste the generic's code and fill in the types, which is the
same Vala would do, right?

The strings are now lost after reading them a few of times (how? I don't
use a single owned keyword). I'll look into that when I get back from
work, but some general ideas on how to debug these issues properly would
be really appreciated. :-)

Regards,
  Dennis

Am 28.08.2012 09:26, schrieb Nor Jaidi Tuah:
> > Scope is supposed to hold "variables" (strings) and "arrays of
> > variables" and provide capability to try and fetch these from parent
> > scopes if the variable is not defined in the current scope. It doesn't
> > even have to do that in the error case below.
> > Dumping "result" before return is reached yields corrupted strings.
> >
> > public class Scope: Object {
> >
> >     protected weak Scope    parent;
> >     protected Variable      local;
> > (...)
> >     public string?[]? get_array(string uri) {
> >
> >         string?[]? result = this.local.get_array(uri);
> >
> >         if (result == null && this.parent != null) { //! result != null here
> >
> >             result = this.parent.get_array(uri);
> >         }
> >
> >         //! at this point result values appear to be invalid
> >
> >         return result;
> >     }
> > (...)
> > }
> Perhaps "parent", being weak, is no longer referring
> to a valid object. Remove "weak" and see.
>
> Nice day
> Nor Jaidi Tuah
>
>
>
>
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