1. RE: help! (DLLs)
i tried that, and no change. btw, i pedump'ed it and apparently it
doesn't add underscores, but all compilers prepend underscores to
function names
stabmaster_ at HOTMAIL.COM wrote:
> Hmm.. does your C file have the following function in it?
>
> BOOL WINAPI __declspec(dllexport) LibMain(HINSTANCE hDLLInst, DWORD
> fdwReason, LPVOID lpvReserved)
> {
> switch (fdwReason)
> {
> case DLL_PROCESS_ATTACH:
> return TRUE;
> break;
> case DLL_PROCESS_DETACH:
> break;
> case DLL_THREAD_ATTACH:
> break;
> case DLL_THREAD_DETACH:
> break;
> }
> return TRUE;
> }
>
>
> Every dll must have a LibMain(). Oh, and now that I think about it; I
> recall
> lcc adding underscores to all function-names. So you prolly should try
> define_c_proc("test_").
>
>
>
2. RE: help! (DLLs)
>i tried that, and no change. btw, i pedump'ed it and apparently it
>doesn't add underscores, but all compilers prepend underscores to
>function names
>
Yeah, most of them do. But only lcc keeps the underscores in the exported
names (that I know of).
I was unable to get your example with puts("Hello World") to work. The
function would be defined properly, but it wouldn't output anything.
However, I do have a working example for you:
<SIMPLE.C>
#include <windows.h>
BOOL WINAPI __declspec(dllexport) LibMain(HINSTANCE hDLLInst, DWORD
fdwReason, LPVOID lpvReserved)
{
switch (fdwReason)
{
case DLL_PROCESS_ATTACH:
return TRUE;
break;
case DLL_PROCESS_DETACH:
break;
case DLL_THREAD_ATTACH:
break;
case DLL_THREAD_DETACH:
break;
}
return TRUE;
}
int extern_add(int a, int b)
{
return a+b;
}
</SIMPLE.C>
<SIMPLE.DEF>
LIBRARY simple
EXPORTS extern_add
</SIMPLE.DEF>
<SIMPLE.EXW>
include dll.e
atom lib,func
lib = open_dll("simple.dll")
func = define_c_func(lib, "_extern_add", {C_INT,C_INT}, C_INT)
printf(1, "%d + %d = %d", {5,8,c_func(func, {5,8})})
-- Prevent the console from being closed immediately.
if getc(0) then end if
</SIMPLE.EXW>
I compiled the dll with:
lcc simple.c
lcclnk -dll -s simple.obj simple.def
(-s strips debugging stuff, or something..)
3. RE: help! (DLLs)
> -----Original Message-----
> From: sephiroth _ [mailto:euman2376 at yahoo.com]
> i tried that, and no change. btw, i pedump'ed it and apparently it
> doesn't add underscores, but all compilers prepend underscores to
> function names
I just made a little dll (dll.dll) with lcc by translating and running
emake. No def file or anything, and it returned the name of the function
with an underscore and @4 appended (1 arg):
-- begin dll.ew
global function huh( atom x )
return rand(5)
end function
-- end dll.ew
Eu function: huh( atom x )
C function: _0huh( int x )
DLL function: __0huh@4
Now, I tried a DEF file (dll.def):
EXPORTS
huh = _0huh
and rebuilt the dll. LCC still exported __0huh@4, but also exported huh.
Removing the __declspec(dllexport) from the function definition (in dll.c)
and the prototype in main_.h, and the only thing exported was huh. The same
thing worked with Borland (I don't have Watcom). LCC seems to need to have
the .def file included in the call to the linker, while Borland finds the
.def file on its own.
Rob, I think it would be better to not declare anything
_declspec(dllexport), but to create a def file with the original Eu routine
names in an export file. It would make things much cleaner, and shouldn't
be too difficult. It would also make it easy to include/exclude routines
from being exported (for instance, if win32lib is included in the source for
the dll, it's probably not necessary to export all the routines in
win32lib).
Matt Lewis
