[vlc-devel] Re: including a .dll

[Adam Collins]

Thanx, Appreciate the help :)

On 9/27/06, Damien Fouilleul <damien.fouilleul at laposte.net> wrote:
>
> here's what you need:
>
> VLC_ADD_LDFLAGS([-L<path to dll> -linpout32])
>
>
> typically, you don't link directly against a .DLL but against an import
> library, which could be named as per your case, either libinout32.a or
> inout32.lib, or something like that.
> however, gcc is quite flexible and will link directly against a DLL.
>
> the problem is that if VLC cannot locate the DLL when it starts, it will
> abort and throw an error.
>
> You may want to weak link the library instead by adding the following
> code in your startup sequence
>
> static short _stdcall (*Inp32)(short PortAddress);
> static void _stdcall (*Out32)(short PortAddress, short data);
>
> initInOut()
> {
>       HMODULE myDll = LoadLibrary("inpout32.dll");
>
>       if ( NULL == myDLL ) /* do error condition */
>
>       Inp32 = GetProcAddress(myDll, "Inp32");
>       Out32= GetProcAddress(myDll, "Out32");
> }
>
> that way you can handle the case when the library is not found, and VLC
> will not abort unless you want it to.
>
> Damien
>
> Adam Collins wrote:
> > Hi
> >
> > I need to include a .dll (inpout32.dll) file that controls parallel
> > port access under winXP, into my VLC build. I have tried to add the line
> > VLC_ADD_LDFLAGS([inpout32])
> > to the configure.ac <http://configure.ac> file
> > and in my module I have declared the function prototypes
> >
> > short _stdcall Inp32(short PortAddress);
> > void _stdcall Out32(short PortAddress, short data);
> >
> > and have add the call
> >
> > Out32(888,0);
> >
> > to my modules function. Unfortunately when I reconfigure it has no
> > errors but when I make I get the error
> >
> > undefined refrence to Out32(888,0)
> >
> > can anyone tell me what I'm doing wrong?
> > or How to include parallel port access into VLC
> >
> > Thanx
> > Adam
>
>
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>

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