Re: [Vala] CCode array length field name

[pHilipp Zabel <philipp zabel gmail com>]

On Tue, Dec 1, 2009 at 12:59 AM, Jan-Jaap van der Geer
<jjvdgeer inbox com> wrote:
> On Mon, 2009-11-30 at 15:09 -0800, Evan Nemerson wrote:
> > On Mon, 2009-11-30 at 23:45 +0100, pHilipp Zabel wrote:
>
> > > [CCode (array_length = false)] will make Vala turn errmess.length into
> > > constant -1 instead of errmess_length1. I don't know of any way to
> > > make that constant 252 instead.
>
> > IIRC this should do the trick:
>
> > [CCode (cname == "os_error")]
> > public struct error {
> >   public unowned int errnum;
> >   public unowned char errmess[252];
> > }
>
> Great, this indeed works. The position of the [] in both versions
> confuse me, though.

Seconded.

> > > If errmess is null-terminated and utf-8 encoded, you could wrap it as
> > > a weak string.
>
> Why weak?

Because otherwise vala will try to call error_destroy () to have it
free the errmess string:

[CCode (cname = "os_error", cheader_filename = "test.h")]
public struct error {
        public int errnum;
        public string errmess;
}

int main (string[] args) {
        error E;
        return 0;
}

-->

gint _main (char** args, int args_length1) {
        gint result;
        os_error E = {0};
        result = 0;
        error_destroy (&E);
        return result;
}

> > I agree, binding it as a string is likely the right way to go.
>
> The string not necessarily 0-terminated (although the vast majority will
> be) and latin1 encoded (though the vast majority will be ASCII only).
>
> Thanks for your help.
>
> Cheers,
> Jan-Jaap
>
>
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