Re: Using handles with C++

From: Joachim Schimpf <>
Date: Wed 26 Feb 2003 08:32:34 PM GMT
Message-ID: <>
Christian Fritz wrote:
> Hello!
> As described in the embedding manual we are trying to pass generic C++
> data to ECLiPSe. We are facing two problems:
> 1. The struct type (t_ext_type) for setting up a proper method table is
> differently defined (in types.h and eclipse_cc.h) from what is said in
> the manual. As far as we can see, it is for pure C programming (using
> pword instead of EC_word..).

It will probably work anyway (but I haven't verified this).

> 2. After getting a handle we'd like to store it somewhere in eclipse for
> further accessing the data. We are able to obtain a handle and xget some
> data. But when trying to save this handle (e.g. assert(
> myHandle(Hbound)) ) and recalling it (myHandle(Hyet_unbound)), we
> immediately receive a segmentation violation.

You need to provide a copy-method for this to work. It seems that
assert/1 erroneously does not detect this problem.
Try setval/getval instead of assert, and make sure you have a copy-
function defined.

> Can anybody help us with these issues? We'd be very happy.
> Thanks in advance
> Christian Fritz
> ps: we are using Eclipse 5.5 on Linux (RedHat 8)

 Joachim Schimpf              /             phone: +44 20 7594 8187
 IC-Parc                     /
 Imperial College London    /
Received on Wed Feb 26 20:32:40 2003

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