Using ObjectAda 7.1 SE lib in VC++ 5.0

Using ObjectAda 7.1 SE lib in VC++ 5.0

[Kai Glsner]

Hello community,

currently I'm using ObjectAda 7.1 SE to become familiar with Ada-95. Is it
possible to use any code (e.g. the object-file or a library), written with
this environment, as a static library in VC++ 5.0? And if "yes", how to do
this.
The background is, that I would like to migrate to Ada-95 in a soft but
steady manner, starting with doing some libs in Ada, and then, may be, do
most of it with Ada-95, that means, calling C-Sources from Ada......

Thanks in advance for the answer

Kai Glaesner

Re: Using ObjectAda 7.1 SE lib in VC++ 5.0

[Stephen Leake]

"Kai Glsner" <kai.glaesner@daimlerchrysler.com> writes:

> Hello community,
> 
> currently I'm using ObjectAda 7.1 SE to become familiar with Ada-95. Is it
> possible to use any code (e.g. the object-file or a library), written with
> this environment, as a static library in VC++ 5.0? And if "yes", how to do
> this.

Yes, you can.

You need to add 'pragma Export (C, ...)' for each Ada function you
want to call from C++. In C, you need to declare the Ada functions
with 'extern C'.

ObjectAda will build object files (.obj). You can either just link
those directly into your VC++ project, or use the MS tools to build a
library.

> The background is, that I would like to migrate to Ada-95 in a soft but
> steady manner, starting with doing some libs in Ada, and then, may be, do
> most of it with Ada-95, that means, calling C-Sources from Ada......

Wait a minute - above you implied you wanted to call Ada from C++. Now
you want to call C from Ada. This is equally possible, using pragma
Import. However, calling C++ member functions is generally not
possible; you'll need to provide an 'extern C' wrapper.

Either way, a gradual transition is definitely the way to go.

-- Stephe

Re: Using ObjectAda 7.1 SE lib in VC++ 5.0

[Kai Glsner]

Stephen Leake schrieb in Nachricht ...
>"Kai Glsner" <kai.glaesner@daimlerchrysler.com> writes:
>
>> Hello community,
>>
>> currently I'm using ObjectAda 7.1 SE to become familiar with Ada-95. Is
it
>> possible to use any code (e.g. the object-file or a library), written
with
>> this environment, as a static library in VC++ 5.0? And if "yes", how to
do
>> this.
>
>Yes, you can.
>
>You need to add 'pragma Export (C, ...)' for each Ada function you
>want to call from C++. In C, you need to declare the Ada functions
>with 'extern C'.
>
>ObjectAda will build object files (.obj). You can either just link
>those directly into your VC++ project, or use the MS tools to build a
>library.
>
>> The background is, that I would like to migrate to Ada-95 in a soft but
>> steady manner, starting with doing some libs in Ada, and then, may be, do
>> most of it with Ada-95, that means, calling C-Sources from Ada......
>
>Wait a minute - above you implied you wanted to call Ada from C++. Now
>you want to call C from Ada. This is equally possible, using pragma
>Import. However, calling C++ member functions is generally not
>possible; you'll need to provide an 'extern C' wrapper.
>

Funny, isn't it?
No, today the "main()" is a C++ Programm, so we will call Ada-Functions from
C++. If everything works well, after lots of C functions the main() will be
(hopefully) rewritten in Ada. Then we will call the (hopefully few)
remaining C-function from Ada.



>Either way, a gradual transition is definitely the way to go.
>
>-- Stephe