Re: [Vala] CCode array length field name

[pHilipp Zabel <philipp zabel gmail com>]

On Mon, Nov 30, 2009 at 10:19 PM, Jan-Jaap van der Geer
<jjvdgeer inbox com> wrote:
> On Sun, 2009-11-29 at 00:38 +0100, pHilipp Zabel wrote:
> > > vapi binding:
> > >
> > > public class SomeStruct {
> > > [CCode (array_param_name?...)] // what should this be ?
> >
> > [CCode (array_length_name = "dataLength", array_length_type = "size_t")]
> >
> > Not sure if that should be size_t or gsize.
>
> 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.
If errmess is null-terminated and utf-8 encoded, you could wrap it as
a weak string.

regards
Philipp