Re: [Vala] Creating bindings for Oracle OCI

[Shawn Ferris <shawn ferris gmail com>]

I'm sorry to keep pestering.. but if I omit the asterick, nothing
changes.. it still aborts.. What I did get to work, sorta, was to omit
the 'out'.. initially I got the error 'error: use of possibly unassigned
local variable `errbuf'' which I got around by declaring errbuf as
'string errbuf = ""'.. now, the buffer is filled, but with only 7
characters of the error:

ORA-121

which should be:

ORA-12154: TNS:could not resolve the connect identifier specified

Which I can get if I change the bufsiz arg from '(int)sizeof(string)' to
512.. but I then it's worse as I also get:

*** glibc detected *** ./x: free(): invalid next size (fast):
0x0000000000688510 ***

Which I presume is because I'm freeing more memory than the string
actually occupies? (I assume this is true, because if I change it to 16,
I get more of the message returned, without the error.. but I can't go
anywhere near the 66 chars needed.. not even 33)

The thing I don't understand is that the docs say if buffsiz isn't big
enough, OCIErrorGet will return null.. so, I'm lead to believe that
oracle is getting a big enough buffer, but somehow string is truncating
it? Should I not be using string?


On Wed, 2009-06-17 at 13:24 +0200, Jiří Zárevúcky wrote:
> You have problem with pointers, again. ;) Once you add "out", it's not
> a pointer anymore as far as Vala is concerned, so you have to omit the
> asterisk. You are essentially replacing it.
>
> 2009/6/17 Shawn Ferris <shawn ferris gmail com>:
> > Ooops.. Resending, didn't realize this didn't go to the list.. my
> > apologies.
> >
> > On Tue, 2009-06-16 at 21:44 -0600, Shawn Ferris wrote:
> > > Man.. I'm so close I can smell it.. I actually have the bindings working
> > > to the point were I am fetching a value from a table. Unfortunately, the
> > > way it sits, I'm stuck with ints alone.. as soon as I try to return a
> > > string, the code aborts.. there's actually two cases where the results
> > > are the same and I'm assuming the fix for one will fix the other, so
> > > I'll ask for help on the easier one. In this case, it's the ErrorGet
> > > function defined as:
> > >
> > > sword OCIErrorGet ( void      *hndlp,
> > >                   ub4        recordno,
> > >                   OraText       *sqlstate,
> > >                   ub4        *errcodep,
> > >                   OraText       *bufp,
> > >                   ub4        bufsiz,
> > >                   ub4        type );
> > >
> > > My vapi definition:
> > >
> > >   [CCode (cname = "OCIErrorGet")]
> > >   public int ErrorGet (
> > >     Error*       error,
> > >     int          record,
> > >     out string*  sqlstate,
> > >     out int*     errcode,
> > >     out string*  buffer,
> > >     int          buffersz,
> > >     HType        type
> > >   );
> > >
> > > And a C example:
> > >
> > >   text errbuf[512];
> > >   OCIErrorGet ((dvoid *) errhp, (ub4) 1, (text *) NULL, &errcode,
> > >             errbuf, (ub4) sizeof(errbuf), (ub4) OCI_HTYPE_ERROR);
> > >
> > > If I leave off errbuf (which should be the physical message string
> > > assoctiate to errcode) everything works fine. EG:
> > >
> > >     int*    errno;
> > >     OCI.ErrorGet ( err, 1, null, out errno, null, 0, HType.ERROR);
> > >     stdout.printf("Error - ORA-%5.5d (%s)\n", (int)errno, action);
> > >
> > > I absolutely get the right error code (i can force which error I gen)
> > > but as soon as I try to touch errbuf the program aborts.. I can not for
> > > the life of me find the correct way to do this. Can someone point me in
> > > the right direction? And then, I'll warn you that I'll have at least one
> > > more email.. but more critique and style.. I'm assuming I haven't
> > > followed the vala way, but I'm more interested in getting it to work and
> > > addressing style later.
> > >
> > > Thanks for the help!
> > > SMF
> >
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