[vlc-devel] Enhancement Request...

[jboileau]

Hi,

This solution only works if the library is not linked with the
application and entry points are found using GetProcAddress. Not the
case with libvlc-control and libvlc.

Jacques

On Fri, Apr 4, 2008 at 9:57 AM, André Weber <WeberAndre at gmx.de> wrote:
> Hello,
>
> just my 2cents ...
>
> on windows it would be not very difficult for the DLL to find out from where
> it was loaded - so that the DLL knows where it is located ... and there is
> no
> need to change search pathes or such things.
>
> Only the application which tries to load the vlc-dll's must know where these
> files are located - f.e. by reading the registry to find the installation
> folder - there
> is no other options - without adding new options to the external programs.
>
> But the VLC DLL's itself - can find out for themself where they are located
> with the code below - and use that information to load the plugins and co.
> from the right folders relative to the VLC DLL's ...
>
>
> char psz_filename[MAXPATH];
> HMODULE h_vlccontrol = GetModuleHandle("libvlc-control.dll");
> if( h_vlccontrol )
> {
>    if( GetModuleFileName( h_vlccontrol , psz_filename,
> sizeof(psz_filename) ) )
>   {
>     /*
>         psz_filename = should now contain the complete filename of
> "libvlc-control.dll"
>         put this code inside "libvlc-control.dll" - to derive from there
> the other pathes to
>         the plugins and co.
>     */
>   }
> }
>
>
>
> André
> --
> Atmo
>
>
>
> ----- Original Message -----
> From: "Remi Denis-Courmont" <rdenis at simphalempin.com>
> To: "Mailing list for VLC media player developers" <vlc-devel at videolan.org>
> Sent: Friday, April 04, 2008 3:22 PM
> Subject: Re: [vlc-devel] Enhancement Request...
>
>
> > hmm, that does not work, I think. LibVLC!could learn its install path and
> > infer the locations of plugins (and even shared data files) from it.
> > Because it calls dlopen or the non-portable equivalent for these. I did
> > file an enhancement ticket for this a while ago.
> >
> > However, it is NOT possible for LibVLC-control to learn the location of
> > LibVLC. The earlier is linked to the latter at build link-time, not
> > run-time. It is hence the OS loader that needs to know the path, not
> > LibVLC-control.
> >
> > Remi Denis
> >
> > -- message original --
> > Sujet: Re: [vlc-devel] Enhancement Request...
> > De: jboileau <jboileau at gmail.com>
> > Date: 04.04.2008 13:03
> >
> > Well we don't really package anything. The application I work on is
> > embedded and I create compact flash images to hold everything. So its
> > not a really big problem for me and its transparent to the end user. I
> > offer my experience mostly to help if it can. I see all the hard work
> > you guys put in, its the least I can when I read emails I can comment
> > on to do so.
> >
> > But the only way to package everything up to not have the path problem
> > would be to put VLC in the same directory as our application. Which I
> > would rather not. It is nice to have VLC in its own directory and our
> > stuff in another. Easier to update one without the other. And easier
> > in the development stage. Visual Studio creates directories for
> > release and debug builds. I would have to add post-build steps to copy
> > the VLC files to the target dir when I run the app from the IDE. Do I
> > want this copy to happen every time I build? No way!
> >
> > It ain't a big deal to do a set current dir to the VLC install dir so
> > that the VLC DLLs can find each other. I could also add the VLC dir to
> > the environment path. But it would also be easy to have
> > libvlc-control.dll know its dir and use it to find libvlc.dll. This
> > problem is very minor and easily circumventable in my environment. I
> > am sure there are more important issues.
> >
> > Jacques Boileau
> >
> > On Thu, Apr 3, 2008 at 9:05 PM, Pierre d'Herbemont <pdherbemont at free.fr>
> > wrote:
> >>
> >> On Apr 3, 2008, at 8:48 PM, jboileau wrote:
> >> > Hi,
> >> >
> >> > I can probably help since I develop on Windows. It is true that there
> >> > is problem loading libvlc-control.dll on Windows. Personaly for the
> >> > moment I am reading the VLC install path from the registry, do a set
> >> > current dir to there, load libvlc and finally load libvlc-control (see
> >> > code below). This is the only way I have found to make it work without
> >> > problems.
> >>
> >> Why don't you package libvlc and plugin with your own app?
> >>
> >>
> >> Pierre.
> >> _______________________________________________
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> >>
> >
> >
> >
> > --
> > Jacques Boileau
> > _______________________________________________
> > vlc-devel mailing list
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> >
> > _______________________________________________
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-- 
Jacques Boileau