Re: [Vala] CCode array length field name

[Jan-Jaap van der Geer <jjvdgeer inbox com>]

On Mon, 2009-11-30 at 15:09 -0800, Evan Nemerson wrote:
> On Mon, 2009-11-30 at 23:45 +0100, pHilipp Zabel wrote:
> > On Mon, Nov 30, 2009 at 10:19 PM, Jan-Jaap van der Geer
> > <jjvdgeer inbox com> wrote:
> > > I have something related. I have the following struct in C:
> > >
> > > typedef struct
> > > {
> > >  int errnum;
> > >  char errmess[252];
> > > } os_error;
> > >
> > > Right now I have this vapified like this:
> > >
> > > [CCode (cname == "os_error")]
> > > public struct error
> > > {
> > >  public unowned int errnum;
> > >  public unowned char[] errmess;
> > > }
> > >
> > > However, when accessing the error.errmess.length I get compilation
> > > errors (in C,, not in Vala. error: 'os_error' has no member named
> > > 'errmess_length1'). I suppose this is due to a problem in the vapi, but
> > > I am not really sure how to tell Vala the length is 252 bytes.
> > >
> > > I tried prefixing the errmess member with:
> > > [CCode (array_length_name = "252", array_length_type = "int")]
> > > but that did not seem to make a difference.
> > >
> > > Any ideas?
> >
> > [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];
> }

I am afraid I need to come back at this. Although your solution works
fine in the situation I provided, I did not get it working for
multidimensional arrays. I get compilation errors trying to do something
like this:

[CCode (cname == "os_error")]
public struct error {
  public unowned int errnum;
  public unowned char errmess[42,42];
}

Is this not supported?

Cheers,
Jan-Jaap