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From: "Hagi Yilmaz" <hagihun@hotmail.com>
Newsgroups: comp.lang.ada
Subject: Interfacing with C++
Date: Thu, 21 Jun 2001 23:28:46 +0300
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Date: 2001-06-21T23:28:46+03:00

Hello,

I have a little problem in Mapping C++, char * to Ada 95 
c.strings_chars_ptr.

in C++ code :

"
....
extern "C" {void ada_call (char *x) }; // ada function I call.
. . .
char *x;
x=(char *) malloc(100);
ada_call(x);
MessageBox(x);
. . .
"

in ada code :

"
  procedure ada_call(x : in out c.strings_chars_ptr) is

  begin

    x:=New_String(Str => "xxx"); -- x changes...

  end ada_call;
. . .
"

My problem :  In C code I write the output by "MessageBox" but see incorrect 
characters are returning from Ada.

   How should I build the Interface?
   When there is a c.strings_chars_ptr with "in out" parameter,
  how can I get correct returnings from ada in such a case?
  How should be the Ada and C codes?

Can anybody help me for that? ...

Hagi Yilmaz
hagihun@hotmail.com



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