Re: [Swig-user] SWIG Python const_char_string problem

[Ervin H. <ai...@gm...>]

Hello William,

thanks for the reply,

On Fri, Feb 08, 2013 at 07:18:28PM +0000, William S Fulton wrote:
> >
> >And as you can see the full swig command, the swig uses the
> >hamlib.swg, which contains the typedef:
> >
> >     67	/* needed because rig.swg and rotator.swg macros require identifiers like arg (no spaces) */
> >     68	%header %{
> >     69		typedef char * char_string;
> >     70		typedef const char * const_char_string;
> >     71		typedef channel_t * channel_t_p;
> >     72		typedef channel_t * const_channel_t_p;
> >     73	%}
> >     74	
> SWIG does not parse code in %header, so it would not have seen the
> typedefs above. See http://www.swig.org/Doc2.0/SWIG.html#SWIG_nn42
> 

As I wrote, I'm not a SWIG expert - and since I've started to
debug this code, I didn't had too much time to have to know it.

So, I don't understand, what does it mean, because I've leave the
%header %{ and pair bracket, recompile the code, but then SWIG
don't put anywhere the typedef, and C compiler has exited:

  CC     hamlibpy_wrap.lo
hamlibpy_wrap.c:3454:41: error: unknown type name ‘const_char_string’
hamlibpy_wrap.c:3455:42: error: unknown type name ‘const_char_string’
hamlibpy_wrap.c:3481:48: error: unknown type name ‘const_char_string’
hamlibpy_wrap.c:3482:44: error: unknown type name ‘const_char_string’
... and so on...

If I put the typedef macro to halibpy_wrap.c directly after SWIG
generates that, the code has compiled correctly. Also, when I've
changed all 'const_char_string' type to 'const char *' in
hamlibpy_wrap.c, the source has compiled too.

But from Python, I get this error:

  File "/usr/local/lib/python2.7/dist-packages/Hamlib.py", line 2533, in send_morse
    def send_morse(self, *args): return _Hamlib.Rig_send_morse(self, *args)
TypeError: in method 'Rig_send_morse', argument 2 of type 'const char *'

So, the difference compared to the first example, the
const_char_string has modified to const char *, the code has
broken same place.


How can I resolve that?


Thanks:


Ervin


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