[DUG] Using Delphi DLL with Borland's C compiler

[Dieter K�hler]

I tried to access a Delphi DLL from within a C program compiled with 
Borland's command line C compiler (BCC 5.5.1), but it does not accept the 
.lib file associated with the DLL.  When I try to compile a test program I 
get the error message "'C:\TEMP\HW\DLLTEST.LIB' contains invalid OMF 
record, type 0x21 (possibly COFF)".  I searched the Web for some 
explanation, but all sites I found say that this error is typical for 
trying to access a MS .lib file while BCC expects a Borland format.  The 
advice is to use implib to create a Borland type .lib file.  But this is 
exactly what I did to create the .lib file (details below).  Any hints?

Dieter K�hler

This is how I created the .lib file from the .dll and tried to compile a 
test program (hw.c):

C:\temp\hw>implib dllTest.dll
Reading dllTest.dll
GetDelphiString
Writing library DLLTEST.lib for DLLTEST.DLL
1 members, NrOfSymbols 4
C:\temp\hw>bcc32 hw.c DLLTEST.lib
Borland C++ 5.5.1 for Win32 Copyright (c) 1993, 2000 Borland
hw.c:
Turbo Incremental Link 5.00 Copyright (c) 1997, 2000 Borland
Error: 'C:\TEMP\HW\DLLTEST.LIB' contains invalid OMF record, type 0x21 
(possibly
 COFF)

This is my Delphi dll project:
------------------------------
library dllTest;
uses
  Windows;
{$R *.res}
  function GetDelphiString: PChar; cdecl;
  begin
    MessageBox(0, 'Click OK and GetDelphiString will return a string!', 
'Info',
                  MB_OK or MB_TASKMODAL);
    result := PChar('This is a string passed from a Delphi DLL');
  end;

  exports
     GetDelphiString;
begin
This is the C file (hw.c):
--------------------------
#include <stdio.h>
#include "DLLTEST.h"
int main(void)
{
  char* S = GetDelphiString();
  puts(S);
  return 0;
}
This is the C header file (DLLTEST.h):
--------------------------------------
char* __cdecl GetDelphiString(void);

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