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Newsgroups: comp.lang.ada,comp.lang.c++
Subject: Re: calling an ada procedure from C++
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Date: Mon, 17 Nov 2003 04:04:03 GMT
Xref: archiver1.google.com comp.lang.ada:2555 comp.lang.c++:6860
Date: 2003-11-17T04:04:03+00:00
List-Id: <comp.lang.ada>

Anthony Moss wrote:
> I have an ada simulation and a windows C++ graphics program already created.
> My task is to transfer the information from the ada written simulation to
> the VisualC++ graphics program. This involves transfering a large structure
> of information from ada to C++. To do this i have written a very small
> program to pass a simple structure from ada to C++, but I am getting run
> time access errors. I will place a copy of the code onto this message, so
> could you tell me what is wrong and how to fix it.
> thanks
> Anthony Moss
> The ada code is .....
> package Output is
> 
>    type Record_T is
>       record
>          First    : Integer;
>          Second   : Integer;
>    end record;
> 
>    --type Record_Ptr is access Record_T;
> 
>    function Struct return Record_T;
>    pragma Export (C, Struct, "Struct");
> 
> end Output;
> 
> package body Output is
> 
>    function Struct return Record_T is
>       A_Record : Record_T :=(2,4);
>       begin
>          return A_Record;
>       end Struct;
> 
> end Output;
> 
> 
> The C++ code is..
> 
> typedef struct {
>  int first;
>  int second;
> } A_Struct;
> 
> extern "C" {
>  A_Struct Struct();
> }
> 
> int main()
> {
>  A_Struct A = Struct();
> 
>  __asm nop;
>  return 0;
> }
> 
> ps when iinclude adainit() and adafinal I am getting
> unresolved external symbol _adafinal.....
> errors
> 
> 
> 
> 

Cross language Ada is always tricky.  What platform are you using (both C++ and 
Ada compilers)?