Jeff Sack
1/11/2007 10:18:00 PM
Hello all. I am seeking some advice on using SWIG to wrap some native
C code provided to me (I don't have the ability to change it).
Basically, I have something like this:
The definition of one of the problematic methods I am trying to wrap
looks something like this. This is in my SWIG interface file (.i
file):
int open_file(ResponseObject **resp, const char *fname);
And the normal way of using this is as follows:
ResponseObject *reponsObj;
const char *filename="input_file";
if(open_file(&reponsObj, filename)!=0)
{
// handle non-zero error code
}
else
{
// success!
}
I think the most natural way of accessing this method might be
something like this:
resp = open_file('input_file')
In this scenario, resp is a Ruby object representing ResponseObject,
and the original int return value is now mapped to a conditionally
thrown exception. If open_file returns 0, then no exception would be
thrown, otherwise, the Ruby method open_file would throw an exception
which wraps the int return code.
Thoughts? I know there is some SWIG/typemap magic that can do this,
but so far I'm a bit stumped. Can someone offer some advice? I can
provide more details if needed.
Thanks so much in advance for your help. Much appreciated.
-Jeff