Problem loading libraries with long paths

[Boereck]

Hi,

I am working on a Windows 7 (64 bit) but on a 32 bit JVM and I am using JNA 3.5.2.
I have to load DLLs by their absolute path, but if I try to load them and the path has a long path (my assumption is 256 characters) loading the library fails with an UnsatisfiedLinkError.
If I understand the JNA code correctly, the absolute path to the DLL will always be computed when loading the the library, so long paths are always a problem.
Is this an inherent restriction of the operating system or is there any way around this?

Thanks,
Max

[twall]

Do you have unicode characters in the path? That could cause the load to fail; only the ANSI version of LoadLibrary has a small path length limit, and JNA uses the unicode version (LoadLibraryExW, actually).

On Jun 13, 2013, at 5:06 PM, Max Bureck wrote:

Hi,

I am working on a Windows 7 (64 bit) but on a 32 bit JVM and I am using JNA 3.5.2.
I have to load DLLs by their absolute path, but if I try to load them and the path has a long path (my assumption is 256 characters) loading the library fails with an UnsatisfiedLinkError.
If I understand the JNA code correctly, the absolute path to the DLL will always be computed when loading the the library, so long paths are always a problem.
Is this an inherent restriction of the operating system or is there any way around this?

Thanks,
Max

—
Reply to this email directly or view it on GitHub.

[Boereck]

Hi, the path does not contain unicode characters. And all the characters used in the long path work in shorter paths. As soon as I have a proper internet connection I will download the JNA sources, build the jnidispatch.dll on my machine, and replace the delivered DLL with mine for testing purposes. But somehow I have the feeling that this won't make a difference.

[avakhrenev]

Hi,

I suppose, this change causes issues, that I'm currently experiencing.

I'm trying to use libvlc 2.1.3 in java project within 64 bit JVM on windows 7. With jna-3.5.2 everyting works fine, but with jna-4.0.0 libvlc can not find its plugin modules. Here's a snippet from the log:

[000000000018bae0] main libvlc debug: VLC media player - 2.1.3 Rincewind
[000000000018bae0] main libvlc debug: Copyright � 1996-2014 the VideoLAN team
[000000000018bae0] main libvlc debug: revision 2.1.3-0-ge6a71cc
[000000000018bae0] main libvlc debug: configured with ../extras/package/win32/../../../configure  '--enable-update-check' '--enable-lua' '--enable-faad' '--enable-flac' '--enable-theora' '--enable-twolame' '--enable-quicktime' '--enable-avcodec' '--enable-merge-ffmpeg' '--enable-dca' '--enable-mpc' '--enable-libass' '--enable-x264' '--enable-schroedinger' '--enable-realrtsp' '--enable-live555' '--enable-dvdread' '--enable-shout' '--enable-goom' '--enable-caca' '--disable-sdl' '--enable-qt' '--enable-skins2' '--enable-sse' '--enable-mmx' '--enable-libcddb' '--enable-zvbi' '--disable-telx' '--enable-nls' '--disable-dirac' '--host=x86_64-w64-mingw32' 'host_alias=x86_64-w64-mingw32'
[000000000018bae0] main libvlc debug: using multimedia timers as clock source
[000000000018bae0] main libvlc debug:  min period: 1 ms, max period: 1000000 ms
[000000000018bae0] main libvlc debug: searching plug-in modules
[000000000018bae0] main libvlc debug: loading plugins cache file \\?\D:\vlc\win64\vlc-213\plugins\plugins.dat
[000000000018bae0] main libvlc debug: recursively browsing `\\?\D:\vlc\win64\vlc-213\plugins'
[000000000018bae0] main libvlc debug: saving plugins cache \\?\D:\vlc\win64\vlc-213\plugins\plugins.dat
[000000000018bae0] main libvlc debug: plug-ins loaded: 1 modules
[000000000018bae0] main libvlc debug: translation test: code is "C"
[000000000018bae0] main libvlc error: No plugins found! Check your VLC installation.

Here is the log with jna-3.5.2 for comparison:

[000000000034bae0] main libvlc debug: VLC media player - 2.1.3 Rincewind
[000000000034bae0] main libvlc debug: Copyright � 1996-2014 the VideoLAN team
[000000000034bae0] main libvlc debug: revision 2.1.3-0-ge6a71cc
[000000000034bae0] main libvlc debug: configured with ../extras/package/win32/../../../configure  '--enable-update-check' '--enable-lua' '--enable-faad' '--enable-flac' '--enable-theora' '--enable-twolame' '--enable-quicktime' '--enable-avcodec' '--enable-merge-ffmpeg' '--enable-dca' '--enable-mpc' '--enable-libass' '--enable-x264' '--enable-schroedinger' '--enable-realrtsp' '--enable-live555' '--enable-dvdread' '--enable-shout' '--enable-goom' '--enable-caca' '--disable-sdl' '--enable-qt' '--enable-skins2' '--enable-sse' '--enable-mmx' '--enable-libcddb' '--enable-zvbi' '--disable-telx' '--enable-nls' '--disable-dirac' '--host=x86_64-w64-mingw32' 'host_alias=x86_64-w64-mingw32'
[000000000034bae0] main libvlc debug: using multimedia timers as clock source
[000000000034bae0] main libvlc debug:  min period: 1 ms, max period: 1000000 ms
[000000000034bae0] main libvlc debug: searching plug-in modules
[000000000034bae0] main libvlc debug: loading plugins cache file D:\vlc\win64\vlc-213\plugins\plugins.dat
[000000000034bae0] main libvlc debug: recursively browsing `D:\vlc\win64\vlc-213\plugins'
[000000000034bae0] main libvlc debug: saving plugins cache D:\vlc\win64\vlc-213\plugins\plugins.dat
[000000000034bae0] main libvlc debug: plug-ins loaded: 389 modules

Not sure if this a right place to post this, but please take a look. Currently it blocks me from using newest version of jna.

Thank you!

[twall]

Maybe it’s libvlc that can’t handle the long path format?

On Feb 11, 2014, at 11:02 AM, Alexey Vakhrenev notifications@github.com wrote:

Hi,

I suppose, this change causes issues, that I'm currently experiencing.

I'm trying to use libvlc 2.1.3 in java project within 64 bit JVM on windows 7. With jna-3.5.2 everyting works fine, but with jna-4.0.0 libvlc can not find its plugin modules. Here's a snippet from the log:

[000000000018bae0] main libvlc debug: VLC media player - 2.1.3 Rincewind
[000000000018bae0] main libvlc debug: Copyright � 1996-2014 the VideoLAN team
[000000000018bae0] main libvlc debug: revision 2.1.3-0-ge6a71cc
[000000000018bae0] main libvlc debug: configured with ../extras/package/win32/../../../configure '--enable-update-check' '--enable-lua' '--enable-faad' '--enable-flac' '--enable-theora' '--enable-twolame' '--enable-quicktime' '--enable-avcodec' '--enable-merge-ffmpeg' '--enable-dca' '--enable-mpc' '--enable-libass' '--enable-x264' '--enable-schroedinger' '--enable-realrtsp' '--enable-live555' '--enable-dvdread' '--enable-shout' '--enable-goom' '--enable-caca' '--disable-sdl' '--enable-qt' '--enable-skins2' '--enable-sse' '--enable-mmx' '--enable-libcddb' '--enable-zvbi' '--disable-telx' '--enable-nls' '--disable-dirac' '--host=x86_64-w64-mingw32' 'host_alias=x86_64-w64-mingw32'
[000000000018bae0] main libvlc debug: using multimedia timers as clock source
[000000000018bae0] main libvlc debug: min period: 1 ms, max period: 1000000 ms
[000000000018bae0] main libvlc debug: searching plug-in modules
[000000000018bae0] main libvlc debug: loading plugins cache file ?\D:\vlc\win64\vlc-213\plugins\plugins.dat
[000000000018bae0] main libvlc debug: recursively browsing `?\D:\vlc\win64\vlc-213\plugins'
[000000000018bae0] main libvlc debug: saving plugins cache ?\D:\vlc\win64\vlc-213\plugins\plugins.dat
[000000000018bae0] main libvlc debug: plug-ins loaded: 1 modules
[000000000018bae0] main libvlc debug: translation test: code is "C"
[000000000018bae0] main libvlc error: No plugins found! Check your VLC installation.

Here is the log with jna-3.5.2 for comparison:

[000000000034bae0] main libvlc debug: VLC media player - 2.1.3 Rincewind
[000000000034bae0] main libvlc debug: Copyright � 1996-2014 the VideoLAN team
[000000000034bae0] main libvlc debug: revision 2.1.3-0-ge6a71cc
[000000000034bae0] main libvlc debug: configured with ../extras/package/win32/../../../configure '--enable-update-check' '--enable-lua' '--enable-faad' '--enable-flac' '--enable-theora' '--enable-twolame' '--enable-quicktime' '--enable-avcodec' '--enable-merge-ffmpeg' '--enable-dca' '--enable-mpc' '--enable-libass' '--enable-x264' '--enable-schroedinger' '--enable-realrtsp' '--enable-live555' '--enable-dvdread' '--enable-shout' '--enable-goom' '--enable-caca' '--disable-sdl' '--enable-qt' '--enable-skins2' '--enable-sse' '--enable-mmx' '--enable-libcddb' '--enable-zvbi' '--disable-telx' '--enable-nls' '--disable-dirac' '--host=x86_64-w64-mingw32' 'host_alias=x86_64-w64-mingw32'
[000000000034bae0] main libvlc debug: using multimedia timers as clock source
[000000000034bae0] main libvlc debug: min period: 1 ms, max period: 1000000 ms
[000000000034bae0] main libvlc debug: searching plug-in modules
[000000000034bae0] main libvlc debug: loading plugins cache file D:\vlc\win64\vlc-213\plugins\plugins.dat
[000000000034bae0] main libvlc debug: recursively browsing `D:\vlc\win64\vlc-213\plugins'
[000000000034bae0] main libvlc debug: saving plugins cache D:\vlc\win64\vlc-213\plugins\plugins.dat
[000000000034bae0] main libvlc debug: plug-ins loaded: 389 modules

Not sure if this a right place to post this, but please take a look. Currently it blocks me from using newest version of jna.

Thank you!

—
Reply to this email directly or view it on GitHub.