From: Jan Dvorak <jan.dvorak@...>
Date: 2008-01-23T01:24:03+09:00
Subject: Re: Swig: how to convert char* to Array?

On Monday 21 January 2008 19:58:44 Adam Bender wrote:
> I have a C++ library that I'm trying to access in Ruby.  One of the C++
> functions returns a char* and I would like this to be converted to an Array
> (since the char* may have 0x00 in it, which terminate a Ruby string
> prematurely).  I'm trying to write a typemap for the conversion, but I'm
> getting stuck on determining the length of the array -- I can't pass that
> as a parameter, since this is an *out* typemap.  So my question is, does
> anyone have a way to convert char* to Array in Swig, hopefully with an
> example? Thanks!

Ruby strings are not null-terminated, so they may contain 0x00 as well as any 
other char. Of course when converting from C char* you have to specify the 
length:

VALUE rubystring;
char str[] = {'a','b',0x00,'c'};

rubystring = rb_str_new(str,4);

Jan