Re: Passing scalars to C functions

Josef Moellers wrote:
> Hi,
> 
> I'm fairly new to the XS business. I have managed to get the skeleton up 
> (h2xs) and have also managed to write short functions that have ints as 
> arguments and return strings, but I'd like to pass a full Perl scalar 
> (my $cdb = pack('C*', 0x12, 0, 0, 0, 128, 0);) and retrieve the length 
> (6) and the bytes themselves in the C function and also return such a 
> scalar.
> 
> How do I do that?
> 
> Thanks,
> 
> Josef
> 


Did you looked at the eval_* functions in perlapi.pod?

eval_pv

     Tells Perl to eval the given string and return an SV* result.
     NOTE: the perl_ form of this function is deprecated.
             SV*     eval_pv(const char* p, I32 croak_on_error)

eval_sv

     Tells Perl to eval the string in the SV.
     NOTE: the perl_ form of this function is deprecated.
             I32     eval_sv(SV* sv, I32 flags)


regards,
Reinhard