Re: [Mingw-users] calling convention: create suitable lib with dlltool

[Wu Y. <ad...@ne...>]

How was the DLL built?  If it was by MSVC, then the recent MinGW toolchain 
should directly work with the library for function exports, like "gcc 
mymain.o multicam.lib".

It it was not the case, the first thing you could try is follow the steps 
outlined in

  http://mingw.sourceforge.net/mingwfaq.shtml#faq-msvcdll

esp. the part the concerning __stdcall functions in the end.

If this still does not work, read

  http://wyw.dcweb.cn/stdcall.htm

try to understand the case, and walk your own way.

Best regards,

Yongwei

--- Original Message from Fe Kater ---

Hi,

I'd be happy for any hint if and maybe how I could create a suitable lib 
for
a dll I have to use. Here are the settings and what I tried so far:


(a) With "dumpbin multicam.dll /exports" I got a list of all 74 functions:

ordinal hint RVA      name
1       0    000066E0 ?McOpenDriverMaintenance@@YGHXZ
2       1    ...      ?_McOpenDriverMaintenance@@YGHXZ
3       2    ...      _AlphaSelfTest@16
..
13      C    ...      _McCreate@8
..
61      3C   ...      __McOpenDriver@4
..
74

Note (don't know if this is significant): The first 2 entrys start with 
"?",
then some functions start with 1 underscore, finally there are functions
with 2 underscores.


(b) There was a def file provided:

IMPORTS
                 McOpenDriver=MULTICAM._McOpenDriver@4
                 McCloseDriver=MULTICAM._McCloseDriver@0
                 McCreate=MULTICAM._McCreate@8
..


(c) There was a lib-file provided which of course did *not* work for me. 
The
error message right when my program starts: Can't find entry point for
function "McOpenDriver".



Here is what I tried:

(a) Changed "IMPORTS" to "EXPORTS" in the provided def file, inserted
"LIBRARY multicam.dll".

(b) Used dlltool in msys like this (tried also combinitions of -U and -k)
dlltool.exe -l name_of_new_lib -D name_of_existing_dll -d def_file_to_read
[-U] [-k]

(c) compiled and linked again against the new lib

(d) program starts with same error: can't find entry for function
McOpenDriver.