在Eclipse / PyDev Jython项目中将.dll添加到java.library.path [英] Add .dll to java.library.path in Eclipse/PyDev Jython project

问题描述

我正在尝试在我的PyDev Jython项目中使用一个编译的.jar Java库。

我成功地将.jar添加到PYTHONPATH，并且能够开始编码与自动完成工作。

库需要.dll扩展名， javaHeclib.dll ，所以我将其添加到我的项目的外部Libs部分。

我可以导入库，但是当我尝试访问其任何功能时，我收到错误： p>

  java.lang.UnsatisfiedLinkError：java.lang.UnsatisfiedLinkError：java.library.path中没有javaHeclib 
  

我在运行配置中添加了一个VM参数，没有运气：

  -Djava.library.path =Y：/path/to/javaHeclib.dll; $ {env_var：PATH}
  

我可以使用上面的 java.library.path 从命令行运行库。

在PyDev控制台中进行实验，我注意到我可以加载.dll扩展名为绝对路径，但不是相对路径：

 >>> import java.lang 
>>> java.lang.System.load（'Y：/path/to/javaHeclib.dll'）
>>> java.lang.System.loadLibrary（'javaHeclib'）
 Traceback（最近的最后一次调用）：
文件< console>，第1行，in？ 
 java.lang.UnsatisfiedLinkError：java.lang.UnsatisfiedLinkError：java.library.path中的javaHeclib 
  

不幸的是，图书馆正在使用上面的 System.loadLibrary 调用，我没有访问它的来源。

为什么 javaHeclib.dll 不在我的 java.library.path ？

编辑

设置 java.library.path 到包含dll的目录不允许我使用 System.loadLibrary 加载它。

  -Djava.library.path =Y：/ path / to / dll /; $ {env_var：PATH}
  

（使用正斜杠没有任何区别。）我还尝试更改 eclipse.ini ，没有运气：

  -vmargs 
 -Dosgi.requiredJavaVersion = 1.5 
 -Xms40m 
 -Xmx384m 
 -Djava.library.path =Y：\path\to\dll\; $ {env_var：PATH}
  




解决方案

我得到了这个工作。

为了将来参考：

说你需要的dll是在 Y：\path\to\dlls\ lib\ 。然后将运行配置的工作目录设置为 Y：\path\to\dlls\ ，并将您的VM参数设置为包含 -Djava。 library.path = lib 。

就是这样，它现在应该可以工作了。我不知道为什么在 java.library.path 中指定绝对路径以前没有工作，但设置工作目录似乎已经完成了。

也许这是我正在使用的特定库（或者Eclipse是从不同的驱动器运行在库中）特有的东西...

I'm trying to use a compiled .jar Java library in my PyDev Jython project.

I successfully added the .jar to the PYTHONPATH and was able to begin coding with auto complete working.

The library requires a .dll extension as well, javaHeclib.dll, so I added that to the External Libs section of my project.

I can import the library fine, but I get an error when I try to access any of its functions:

java.lang.UnsatisfiedLinkError: java.lang.UnsatisfiedLinkError: no javaHeclib in java.library.path

I added a VM argument to my Run Configuration, with no luck:

-Djava.library.path="Y:/path/to/javaHeclib.dll;${env_var:PATH}"

I can run the library from the command line just fine using the java.library.path above.

Experimenting in the PyDev Console, I noticed I can load the .dll extension with an absolute path, but not a relative one:

>>> import java.lang
>>> java.lang.System.load('Y:/path/to/javaHeclib.dll')
>>> java.lang.System.loadLibrary('javaHeclib')
Traceback (most recent call last):
  File "<console>", line 1, in ?
java.lang.UnsatisfiedLinkError: java.lang.UnsatisfiedLinkError: no javaHeclib in java.library.path

Unfortunately, the library is using the the System.loadLibrary call above, and I don't have access to its source.

Why is javaHeclib.dll not in my java.library.path?

EDIT

Setting the java.library.path to the directory containing the dll didn't allow me to load it using System.loadLibrary.

-Djava.library.path="Y:/path/to/dll/;${env_var:PATH}"

(Using forward slashes didn't make a difference.) I also tried changing the default VM args in eclipse.ini, with no luck:

-vmargs
-Dosgi.requiredJavaVersion=1.5
-Xms40m
-Xmx384m
-Djava.library.path="Y:\path\to\dll\;${env_var:PATH}"

解决方案

I got this working.

For future reference:

Say the dll you need is in Y:\path\to\dlls\lib\. Then set your Run Configuration's working directory to Y:\path\to\dlls\ and set your VM arguments to include -Djava.library.path=lib.

That's it, it should now work. I don't know why specifying an absolute path in java.library.path didn't work previously, but setting a working directory seems to have done it.

Perhaps it's something peculiar to the specific library I'm using (or that Eclipse is running from a different drive than the library is on)...

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