Re: DLL help needed...

Re: DLL help needed...

[Richard Stanton]

>>>>> ">>" == Mikey  <jeffdbREMOVETHIS@netzone.com> writes:

    > [c:\projects\excel]exe
    > i 10.000000, j 11.000000, k -1.#IND00

    >> Could this help?
    >>  __attribute__((__stdcall__)) double RHS (double x, double y)
    > {
    > return (x + y);
    > }

Thanks for the suggestion. It makes some difference, but unfortunately
not to the output! 

With this change, I no longer need to compile with the -mrtd option,
and I need to change my dll.def file - using -mrtd I need

RHS
RHS@16=RHS

Using the explicit stdcall attribute in the .C file, and compiling
without -mrtd, the DEF file needs to be the other way round:

RHS@16
RHS=RHS@16

However, the program output is the same:

C:\PROJECTS\excel>exe
i 10.000000, j 11.000000, k -1.#IND00

Again, if I use exactly the same files, but replacing every "double"
with a "short", (and RHS@4 instead of RHS@16 where appropriate) the
program runs perfectly.

I just tried again, this time removing all stdcall references. The
program still fails, but this time I get

C:\PROJECTS\excel>exe
i 10.000000, j 11.000000, k 0.000000

(the last number is supposed to be the sum of the other two)

I'm still confused...

Richard Stanton
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Re: DLL help needed

[Mumit Khan]

"Carlos Albar-Diaz" <carlosad@yahoo.com> writes:
> I have failed in my attempt to modify Mumit's "dllhelpers" package to 
> create dlls  from WINAPI/__stdcall functions.  It works all right when 
> the function inputs/outputs are integers, but it fails when I try to
>  use floats or doubles.

It's a bug in GCC (incorrectly pops floating point stack in addition to
the regular one!), and has been reported. Unfortunately, I have no idea
when it will be fixed.

You're right that this bug pretty much kills the prospect of using EGCS
to produce loadable functions for VB etc which require WINAPI.

Regards,
Mumit

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Re: DLL help needed

[Carlos Albar-Diaz]

I have failed in my attempt to modify Mumit's "dllhelpers" package to 
create dlls  from WINAPI/__stdcall functions.  It works all right when 
the function inputs/outputs are integers, but it fails when I try to
 use floats or doubles.

I have browsed all the relevant archives and I have seen similar problems
reported, but no solutions.

Any ideas? I will appreciate them very much.

BTW, I am using egcs1.1 for mingw32.

Thanks, Carlos
PS: Thanks Jens for your comments, now I attach all the files for your enjoyment :)

This is the (failed) output of the program usedll.c, attached below:
-----------------
dll_double_square (3.0) = -1.#IND00  ---> calcs the square of a double
                                         (fails with WINAPI convention)
dll_int_square (30,40) = 1200        ---> multiplies 2 ints, works OK
------------------

When I get rid of the WINAPI attributes, everything works well. The
problem I have is that I have to use WINAPI to call the DLL from 
MS Excel.

All the sources and make commands follow:
-------------------
make commands
-------------------
gcc -c -DBUILDING_DLL=1 -I. -g -Wall  -o cdll.o cdll.c
gcc -c -DBUILDING_DLL=1 -I. -g -Wall  -o dllinit.o dllinit.c
dlltool --export-all --output-def cdll.def cdll.o dllinit.o
dllwrap --def cdll.def --driver-name gcc -o cdll.dll \
    cdll.o dllinit.o  
gcc -c -I. -g -Wall  -o usedll.o usedll.c
dlltool --dllname cdll.dll --def cdll.def \
    --output-lib libcdll.a
gcc -o usedll.exe -g -Wall   usedll.o -L./ -lcdll

C:\usr\dll\c>


------------------------
cdll.c
-------------------------
#include "cdll.h"
DLLIMPORT WINAPI int 
dll_int_square (int i, int j)
{
  return i * j;
}
DLLIMPORT WINAPI double 
dll_double_square (double d)
{
  return d * d;
}
------------------------
cdll.h
-------------------------
#include "windows.h"  //CAD inserted this
#ifndef cdll_h_included
#define cdll_h_included
#if BUILDING_DLL
# if __GNUC__ && ! defined(__declspec)
#  define DLLIMPORT
#  define DECLSPEC_NOT_SUPPORTED
# else /* ! __GNUC__ || __declspec */
#  define DLLIMPORT __declspec (dllexport)
# endif /* ! __GNUC__ || __declspec */
#else /* Not BUILDING_DLL */
# if __GNUC__ && ! defined(__declspec)
#  define DLLIMPORT extern
#  define DECLSPEC_NOT_SUPPORTED
# else /* ! __GNUC__ ||  __declspec) */
#  define DLLIMPORT __declspec (dllimport)
# endif /* ! __GNUC__ ||  __declspec) */
#endif /* Not BUILDING_DLL */


DLLIMPORT WINAPI int dll_int_square (int, int) ;
DLLIMPORT WINAPI double dll_double_square (double);

#ifndef DECLSPEC_NOT_SUPPORTED
#else /* DECLSPEC_NOT_SUPPORTED */
#define dll_global_int_var (*_imp__dll_global_int_var)
#endif /* DECLSPEC_NOT_SUPPORTED */
#endif /* cdll_h_included */
------------------------
usedll.c
-------------------------
#include <stdio.h>
#include "cdll.h"
int main () { 
  printf ("dll_double_square (3.0) = %f\n", dll_double_square (3.0));
  printf ("dll_int_square (30,40) = %d\n", dll_int_square (30,40));
  return 0;
}
-----------------------------
cdll.def (generated automatically, same for the import library and the dll)
-----------------------------
; dlltool --export-all --output-def cdll.def cdll.o dllinit.o
EXPORTS
	dll_int_square@8 @ 1 ; 
	dll_double_square@8 @ 2 ; 
-----------------------------
dllinit.c
-----------------------------
/* dllinit.c -- Portable DLL initialization. 
   Copyright (C) 1998 Free Software Foundation, Inc.
   Contributed by Mumit Khan (khan@xraylith.wisc.edu).
 */

#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#undef WIN32_LEAN_AND_MEAN
#include <stdio.h>

BOOL APIENTRY DllMain (HINSTANCE hInst, DWORD reason, 
                       LPVOID reserved /* Not used. */ );

#ifdef __CYGWIN32__

#include <cygwin32/cygwin_dll.h>
DECLARE_CYGWIN_DLL( DllMain );
/* save hInstance from DllMain */
HINSTANCE __hDllInstance_base;

#endif /* __CYGWIN32__ */

BOOL APIENTRY
DllMain (
	 HINSTANCE hInst /* Library instance handle. */ ,
	 DWORD reason /* Reason this function is being called. */ ,
	 LPVOID reserved /* Not used. */ )
{

#ifdef __CYGWIN32__
  __hDllInstance_base = hInst;
#endif /* __CYGWIN32__ */

  switch (reason)
    {
    case DLL_PROCESS_ATTACH:
      break;
    case DLL_PROCESS_DETACH:
      break;
    case DLL_THREAD_ATTACH:
      break;
    case DLL_THREAD_DETACH:
      break;
    }
  return TRUE;
}

\x1a
>  What exactly is the problem? Do you get any error messages? How does
> the names look in the .dll? Have you exported the functions? I'm not
> sure the __stdcall does that. I guess you link a .def file with the .dll
> to export the functions. Have you looked att the site for mingw32???
> 
>  Jens Yllman
> 


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DLL help needed.

[Murugan Muthusamy]

Hi everyone,

I'm trying to build  Netscape win32 plugin DLL
with gnu-win32 tools. 
I'm getting the following link errors.

win.exp(.edata+0x30):fake:undefined reference to NP_GetEntryPoints.

Any suggestions? or references?

Thanks in advance.
muru@ia-us.com




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Re: DLL help needed

[Jens Yllman]

 Hello,

 I'm quite new to use gcc to compile on the win32 platform. So I'm not
sure I can help you. But one of the big problems is namemangling.
Especially when we compile C++ programs. That's why you use the extern
"C" syntax on functions that should use C namemangling. But when it is
win32 functions they should be using pascal namemangling and parameter
passing. This is only if the system is to call the function. And
probably MS Excel whan the pascal namemangling. And what I understand is
that __stdcall is used to get pascal namemangling and parameter passing. 
 What exactly is the problem? Do you get any error messages? How does
the names look in the .dll? Have you exported the functions? I'm not
sure the __stdcall does that. I guess you link a .def file with the .dll
to export the functions. Have you looked att the site for mingw32???

 Jens Yllman

Carlos Albar-Diaz wrote:
> 
> I am not able to use my mingw32-built DLLs from MS Excel.  The problem seems to be the DLLs need to use the __stdcall convention, and the instructions/makefiles I have are for _cdecl convention.
> 
> How do I make a dll from an .o file that contains a function defined woth __stdcall? How do I find out the mangling of the function name?  Mumit's makefiles do all this OK until I put __stdcall in the function.
> 
> I have browsed the files but none of the "recipes" I saw  work with __stdcall.
> 
> I will greatly appreciate your help.
> 
> Carlos
> 
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DLL help needed

[Carlos Albar-Diaz]

I am not able to use my mingw32-built DLLs from MS Excel.  The problem seems to be the DLLs need to use the __stdcall convention, and the instructions/makefiles I have are for _cdecl convention.

How do I make a dll from an .o file that contains a function defined woth __stdcall? How do I find out the mangling of the function name?  Mumit's makefiles do all this OK until I put __stdcall in the function.

I have browsed the files but none of the "recipes" I saw  work with __stdcall.

I will greatly appreciate your help.

Carlos

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DLL help needed

[Carlos Albar-Diaz]

I am not able to use my mingw32-built DLLs from MS Excel.  The problem seems to be the DLLs need to use the __stdcall convention, and the instructions/makefiles I have are for _cdecl convention.

How do I make a dll from an .o file that contains a function defined woth __stdcall? How do I find out the mangling of the function name?  Mumit's makefiles do all this OK until I put __stdcall in the function.

I have browsed the files but none of the "recipes" I saw  work with __stdcall.

I will greatly appreciate your help.

Carlos

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DLL help needed

[Carlos Albar-Diaz]

I am not able to use my mingw32-built DLLs from MS Excel.  The problem seems to be the DLLs need to use the __stdcall convention, and the instructions/makefiles I have are for _cdecl convention.

How do I make a dll from an .o file that contains a function defined woth __stdcall? How do I find out the mangling of the function name?  Mumit's makefiles do all this OK until I put __stdcall in the function.

I have browsed the files but none of the "recipes" I saw  work with __stdcall.

I will greatly appreciate your help.

Carlos

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DLL help needed...

[Richard Stanton]

I'm getting close to creating working DLLs. With a lot of help from
Giandomenico De Sanctis, I've actually created a DLL file that
passes/returns short ints, and can be used in Excel 97, but I'm having
trouble when the functions pass/return double arguments. In fact, I'm
having trouble even in plain C.

Here's a simple example, which produces the following (odd looking)
output

[c:\projects\excel]exe
i 10.000000, j 11.000000, k -1.#IND00

When I pass everything as short instead of double, it all seems to
work OK. Any idea what I'm doing wrong? I attach all the necessary
files to get this to compile.

By the way, I'm compiling this using mingw32.

Thanks a lot.

Richard Stanton

------------------------------------------------------------------------

exe.c:

------------------------------------------------------------------------

#include <stdio.h>

double RHS (double x, double y) __attribute__((stdcall));

int main()
{
	double i, j, k;

	i = 10;
        j = 11;

	k = RHS(i,j);

	printf ("i %lf, j %lf, k %lf\n", i, j, k);
    
	return 0;
}

------------------------------------------------------------------------

dll.c:

------------------------------------------------------------------------

double RHS (double x, double y)
{
    return (x + y);
}

------------------------------------------------------------------------

dll.def:

------------------------------------------------------------------------

EXPORTS
RHS
RHS@16=RHS

------------------------------------------------------------------------

makefile:

------------------------------------------------------------------------

dll.dll:	dll.c dll.def
	dlltool --def dll.def --output-exp dll.exp --output-lib dll.a --dllname dll.dll -k
	gcc -g -o dll.dll dll.c dll.exp -Xlinker --image-base=0x40000000 -dll -mrtd -ggdb3

exe.exe:	exe.c dll.dll
	gcc exe.c dll.a -g -o exe.exe

------------------------------------------------------------------------

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