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From: Shark8 <onewingedshark@gmail.com>
Newsgroups: comp.lang.ada
Subject: Re: Using dll from a C# code
Date: Wed, 29 Feb 2012 12:00:39 -0800 (PST)
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Date: 2012-02-29T12:00:39-08:00
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On Feb 29, 5:52=A0am, "Rego, P." <pvr...@gmail.com> wrote:
> Hello,
>
> I have a method in C# which I need to export to Ada using a dll. Maybe
>
> // simple.cs
> // compile with csc /t:library simple.cs
> using System;
> public class VerifyClass{
> =A0 =A0 =A0 =A0 public bool Verify(){
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 return true;
> =A0 =A0 =A0 =A0 }
>
> }
>
> In order to use the function Verify() in Ada, I need to import this to so=
mething like
> -- simple.ads
> package Simple is
> =A0 =A0 =A0 =A0 function Verify return Boolean;
> =A0 =A0 =A0 =A0 pragma Import
> =A0 =A0 =A0 =A0 (Convention =A0 =A0=3D> dll,
> =A0 =A0 =A0 =A0 Entity =A0 =A0 =A0 =A0=3D> Verify,
> =A0 =A0 =A0 =A0 External_Name =3D> "Verify");
> end Simple;
>
> And I could use with
> -- main.adb
> -- build with gnatmake main -largs -lsimple
> with Text_IO; use Text_IO;
> with Simple; use Simple;
> procedure Main is
> begin
> =A0 =A0 =A0 =A0 Put_Line (Boolean'Image (Verify));
> end Main;
>
> When I build the Ada with
> gnatmake main -largs -lsimple
>
> the compiler returns me
> ./main.o(.text+0xd6):main.adb: undefined reference to `Verify@0'
>
> So what have I missed? Maybe the C# code structure should be changed?

You have to be sure you are using the compiler for .NET; I think
there's something about qualifying names too, but I don't remember
what. You may want to check out the import pragma on page 16 in this
pdf: http://www.usafa.edu/df/dfe/dfer/centers/accr/docs/carlisle2006b.pdf