[Mingw-users] Re: [Mingw-msys] dllwrap versus a2dll

[Earnie B. <ear...@ya...>]

Since this isn't MSYS specific it is better asked on the mingw-users 
list.  I'm redirecting there.  Please remove 
min...@li... from the distribution when responding.

Earnie.

Shaun Kelly wrote:
> Good Day All,
> 
> I am having major problems with dll's that I am creating!  I am a linux
> programmer who is trying
> to port c code to windows using mingw/msys.  I am needing to create DLL's that
> both c exe's and
> Java jar's can access via the jni interface.  (My priority is Java access thou.
> I must add that the code
> is working under linux using so shared libraries.  )
> I am running msys-1.0.9 and mingw3.0 on winXP PC.
> 
> My errors are :
> java.lang.UnsatisfiedLinkError:
> C:\msys\1.0.9\local\bin\iss\libstdj_JniEventReader2.dll: Invalid access to
> memory location
> 
> What is the best way of creating DLL's unders Mingw/Msys?  I am using dllwrap as
> follows :
> (I pass a library name and list of objects and a list of libraries to this
> script)
> ----------
>    ....
>    AR_EXT=a
>    DLL_EXT=dll
>    DEF_EXT=def
>    TARGET=${ARG1}.${DLL_EXT}
>    ARCH=${ARG1}.${AR_EXT}
>    ARCHIVE=${ISSLIB}/${ARCH}
>    DLLNAME=${ARG1}.${DLL_EXT}
>    DEFNAME=${ARG1}.${DEF_EXT}
>    NEWDEF=new_${DEFNAME}
> 
> dllwrap --export-all \
>             --enable-stdcall-fixup \
>             --add-stdcall-alias \
>             --output-def  ${DEFNAME}2 \
>             -L${ISSLIB} \
>             -o ${TARGET} $* -lm
> 
>    impdef ${DLLNAME} > ${NEWDEF}
> 
>   dllwrap  --export-all \
>                --enable-stdcall-fixup \
>                --add-stdcall-alias \
>                --def ${NEWDEF} \
>                --output-def ${DEFNAME} \
>                --implib ${ARCH} \
>                -L${ISSLIB} \
>                -o ${TARGET} $*
>     ...
> ---------
> I have put ' __declspec(dllexport)' infront of every function that I export.  (I
> actually don't know when to use
> dllimport, and wether or not to use it for global variables that I want to
> access from outside?)
> 
> If I don't use the impdef on the dll I create and use the generated .def file to
> create the final dll I cannot link
> against the dll.
> 
> Can you help ?
> 
> Regards
> Shaun.
> --
> Shaun Kelly
> ISS International Limited, Technical Division, Software Engineering
> P O Box 12063, DIE BOORD 7613, South Africa
> Tel: +27 (0)21 809-2096 Fax: +27 (0)21 809-2061
> Email: sh...@is... Web Page: http://www.issi.co.za
> 
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