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From: "Gerd" <GerdM.O@t-online.de>
Newsgroups: comp.lang.ada
Subject: Problem creating bindings - please help
Date: 17 May 2006 23:46:23 -0700
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Date: 2006-05-17T23:46:23-07:00
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Hi all,

I tried to create my own Ada bindings for a dll, but I didn't succeed.


The C-header contains:

DWORD __stdcall CAN_GetHwParam(
        HCANHW hHw,
        WORD   wParam,
        void*  pBuff,
        WORD   wBuffLen);


My Ada-spec look like this:

with System;

package CanApi2 is

pragma Linker_Options ("-lCanApi2");

subtype
  HCANHW is Integer;

subtype
  Word is Integer;

function CAN_GetHwParam (hHw : HCANHW; wParam : Word; pBuff :
System.Address; wBuffLen : Word) return Integer;

private
    pragma Import (Stdcall, CAN_GetHwParam, External_Name =>
"CAN_GetHwParam");
end CanApi2;

The lib-file (CanApi2.lib) contains this names:

 _CAN_GetHwParam@16 __imp__CAN_GetHwParam@16 _CAN_SetHwParam@12
__imp__CAN_SetHwParam@12


And that's what I get when build my test-program:

C:\Work\CAN>gnatmake cantest
gcc -c cantest.adb
gcc -c canapi2.ads
gnatbind -x cantest.ali
gnatlink cantest.ali
./cantest.o(.text+0x264):cantest.adb: undefined reference to
`CAN_GetHwParam@16'

gnatlink: cannot call C:\GNAT\bin\gcc.exe
gnatmake: *** link failed.

DLL2DEF shows this:

EXPORTS
	CAN_GetHwParam


So what's wrong with my code? Please help, thanks.

Gerd