Re: [Swig-user] Optional or conditional %include

[Bob H. <bh...@co...>]

On 1/25/2013 3:17 AM, oukrid nabil wrote:
>
> Hello everybody,
>
>
> I am currently facing a problem to wrap a function which prototype is as
> follows:
>
> extern int SPOTDecryptFN(               /* Description */
>        char* sModeleFN,                            /*:INPUT: Name of the model*/
>        unsigned char ucKey[V_KEYLEN],   /*:INPUT: Key */
>        char*** pasTabChainesFN,                 /*:OUTPUT: each line of the
> model */
>        int*  iNbLgnRemplies,                       /*:OUTPUT: Number of
> lines of the array *pasTabChainesFN which are filled */
>        char  c512ErrorMsg[512]                  /*:OUTPUT: Error message   */ );
>
>
> Actually, I want to return in python the three outputs of the function, but
> I have some difficulties to return the "pasTabChainesFN" argument.
>
> I tried to use a [typemap(out) char***] method in the interface file, but it
> didn'r work.
>
>
> Thanks for your help,

Hello, Nabil.

The typemaps are only going to work on values that are visibly
returned/provided in the exchange.  That would work if the 'char ***' were the
return type of the function SPOTDecryptFN(), but it is returning an int.

For function arguments, you have to do something a bit more complicated and
actually declare them as outputs to be processed.  Have a look at the "argout"
type of typemap in the SWIG docs (should be somewhere near the 10.5.7 entry). 
You'll need something like:

    %typemap(argout) char*** pasTabChainesFN {
        // convert char*** to something the target language understands
        ...
    }

(Just an unrelated observation:  if the first two arguments to SPOTDecryptFN()
are input-only, the really should be prefaced with "const" to indicate that.)