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From: "Garry" <ggkraemer@cox.net>
Newsgroups: comp.lang.ada
Subject: Interfacing to C
Date: 8 Feb 2005 10:07:58 -0800
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Date: 2005-02-08T10:07:58-08:00
List-Id: <comp.lang.ada>

I'm just starting in ADA.  Can anyone explain why I have to define a
dummy procedure in my hsdbg package to get my code to work?

Error without dummy procedure:
hsdbg.ads:4:09: package "HSDBG" does not allow a body
hsdbg.ads:4:09: remove incorrect body in file "hsdbg.adb"
gnatmake: "hsdbg.ads" compilation error
error: "hsdbg.adb" must be recompiled ("hsdbg.ads" has been modified)
gnatlink: Failed to open binder output

Code follows:
/* Start of marktime.c */
#include <stdio.h>

void marktime(char  str[255])
{
   printf("marktime: str='%s'\n",str);
}
/* End of marktime.c */



-- Start of hsdbg.ads
--
with Interfaces.C;
with Interfaces.C.Strings;

package HSDBG is
--  Dummy procedure?
      type DUMB is digits 5 range 0.0 .. 1.0E10;
      procedure DUMMY (B : DUMB);
--  End Dummy procedure
      procedure marktime(Variable : Interfaces.C.Strings.chars_ptr);
      pragma Import(C, marktime, "marktime");
end HSDBG;
-- End of hsdbg.ads



-- Start of hsdbg.adb
--
with Ada.Text_IO; use Ada.Text_IO;
with Interfaces.C.Strings; use Interfaces.C.Strings;
--
--  Define package body
--
package body HSDBG is
--
--
--  dummy procedure?
  procedure DUMMY(B : DUMB) is
  begin
     put("In Dummy");
  end DUMMY;
--  end dummy procedure

   procedure marktime(Variable : String) is

      procedure marktime(Variable : chars_ptr);
      pragma Import(C, marktime, "marktime");

      Variable_In_C_Format : chars_ptr := New_String(Variable);


   begin
      marktime(Variable_In_C_Format);
      Free(Variable_In_C_Format);
   end marktime;


 end HSDBG;
-- End of hsdbg.adb




-- Start of tst.adb
with Ada.Text_IO; use Ada.Text_IO;
with Interfaces.C.Strings; use Interfaces.C.Strings;
with hsdbg; use hsdbg;

procedure tst is

  C_Format : chars_ptr := New_String("This is a string in ADA that is
written by the marktime C procedure");

begin
   Put_Line ("test started");
   marktime(C_Format);

end tst;
-- End of tst.adb