Groups > comp.lang.java.programmer > #8507

Re: loading dll within a jar

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From	Owen Jacobson <angrybaldguy@gmail.com>
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Date	Mon, 3 Oct 2011 23:53:25 -0400
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On 2011-10-03 20:47:22 +0000, Philipp Kraus said:

> Hello,
> 
> is there a way to load a DLL library that is stored within a Jar?
> At the time I'm using the -Djava.library.path flag but I would like
> to store the DLL within the Jar and added the path dynamically.
> 
> I've found some information about this eg extract the DLL to the
> temp directory and set the -D option on the main-method.
> 
> Can I set also the library path to the java command like the classpath
> argument? My java classes use the a
> static { System.loadLibrary("dllname"); }
> to load the library, so can I add on the static attribute a call for loading
> the dll within the jar?
> 
> Thanks
> 
> Phil

DLL files (and their Unix counterparts) are loaded by the OS's binary 
image loader, which near-universally expects a program or library to 
come from a file on the filesystem. A loader that's clever enough to 
look inside a ZIP file is a rare beast indeed.

Short answer, no, you can't get there from here. Unpack your .DLL 
somewhere (java.io.tmpdir, for example) and load it from there. The 
Java Web Start protocol includes support for native libraries 
distributed inside JAR files, if you don't want to write the 
unpack-and-load glue yourself and if your app is appropriate for web 
start.

-o

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Thread

loading dll within a jar Philipp Kraus <philipp.kraus@flashpixx.de> - 2011-10-03 22:47 +0200
  Re: loading dll within a jar Owen Jacobson <angrybaldguy@gmail.com> - 2011-10-03 23:53 -0400
    Re: loading dll within a jar Philipp Kraus <philipp.kraus@flashpixx.de> - 2011-10-04 11:19 +0200
    Re: loading dll within a jar Roedy Green <see_website@mindprod.com.invalid> - 2011-10-04 02:33 -0700
      Re: loading dll within a jar Philipp Kraus <philipp.kraus@flashpixx.de> - 2011-10-04 14:19 +0200
  Re: loading dll within a jar Roedy Green <see_website@mindprod.com.invalid> - 2011-10-03 22:28 -0700
  Re: loading dll within a jar Roedy Green <see_website@mindprod.com.invalid> - 2011-10-15 14:20 -0700
  Re: loading dll within a jar Arne Vajhøj <arne@vajhoej.dk> - 2011-10-16 22:38 -0400

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