Re: [Swig-user] Newbie question... Pointer to pointer to char

[Nitro <ni...@dr...>]

Am 17.07.2006, 15:58 Uhr, schrieb Fabio Mancinelli
<Fab...@pp...>:

> Hello all,
>
> I want to use some rpmlib functionalities from Java but I don't know how  
> to
> handle some parameter passing stuff.
>
> I generated the SWIG wrappers by simply creating an interface file which
> directly includes rpmlib.h and I followed the tutorial to compile them.
>
> Now I wanted to call some functions to check if everything works. I  
> chose a
> function whose C prototype is the following:
>
> void rpmGetOsInfo(const char ** name, int * num);
>
> Here I should allocate a memory area consisting of chars for storing the  
> name
> and pass a pointer to that area. And that's fine... In C! :)
>
> Going to the Java generated code I see that the corresponding method is:
>
> public static void rpmGetOsInfo(SWIGTYPE_p_p_char name, SWIGTYPE_p_int  
> num)
>
> Looking at the SWIGTYPE_p_p_char I expected something like a constructor  
> to a
> SWIGTYPE_p_char which has, in turn, another constructor that takes  
> either a
> char[] or a StringBuffer but... I don't see anything of what I imagined!  
> I
> only see long args!
>
> So the question is... How do I correctly allocate that buffer in order to
> succesfully call the rpmGetOsInfo method?
>
> Thanks.

http://www.swig.org/Doc1.3/Java.html#converting_java_string_arrays