Java：util_USBUIRT.dll：找不到依赖库 [英] Java: util_USBUIRT.dll: Can't find dependent libraries

问题描述

我要使用此JAR文件（ http://sourceforge.net/projects/uirt-j / ）。在Eclipse中，我使用项目> Java构建路径>添加外部JAR来导入它。我可以看到所有类的JAR文件在Ecplise。这个JAR包含两个dll文件。为了加载dll，我把System32 dir，但是当一个执行我的代码，我得到以下错误：

I want to use this JAR file (http://sourceforge.net/projects/uirt-j/) in my project. In Eclipse I used th option Project > Java Build Path > Add External JARs to import it. I can see all classes of JAR file in Ecplise. This JAR contains two dll files. In order to load dlls, I put into System32 dir, but when a execute my code, a I get the follow error:

Exception in thread "main" java.lang.UnsatisfiedLinkError:
C:\Windows\System32\util_USBUIRT.dll: Can't find dependent libraries
at java.lang.ClassLoader$NativeLibrary.load(Native Method)
at java.lang.ClassLoader.loadLibrary0(Unknown Source)
at java.lang.ClassLoader.loadLibrary(Unknown Source)
at java.lang.Runtime.loadLibrary0(Unknown Source)
at java.lang.System.loadLibrary(Unknown Source)
at util.USBUIRT.<clinit>(USBUIRT.java:269)
at Uirt.main(Uirt.java:6)

使用Dependence Walker我可以看到所有的DLL都在System32文件夹中。我的代码：

Using Dependence Walker I can see that all DLLs are in System32 folder. My Code:

import util.USBUIRT;
public class Uirt {
public static void main(String[] args) {
    String code = "0000";   
    try {
        USBUIRT.transmitIR(code, 2, 3, 2);
    } catch (Exception e) {
        e.printStackTrace();
    }
  }
}

如果单独执行JAR，工作正常。谢谢。 （Windows 7x64）

If JAR is executed alone, that works fine. Thanks. (Windows 7x64)

推荐答案

提到的jar中的dll是32位。环境是Win7 x64。我假设JVM是32位，否则会有另一个错误，即：无法在AMD 64位平台上加载IA 32位.dll 或类似的。

The dlls in the mentioned jar are 32 bit. The environment is Win7 x64. I assume the JVM is 32 bit otherwise there would be another error, ie: Can't load IA 32-bit .dll on a AMD 64-bit platform or similar.

尝试将dll复制到 C：\Windows \SysWOW64 ，而不是 C ：\Windows \System32 。 32位dll应该进入 C：\Windows \SysWOW64 。它为我工作，虽然我有 util.USBUIRT $ NotInitializedException 这可能是指示库正确加载。

Try copying the dlls into C:\Windows\SysWOW64 rather than C:\Windows\System32. 32 bits dlls should go into C:\Windows\SysWOW64. It worked for me, although I got util.USBUIRT$NotInitializedException which is probably the indication the libraries were loaded properly.

文件系统重定向器文章可以阐明 SysWOW64 vs System32 。

File System Redirector article may shed some light on SysWOW64 vs System32.

编辑：调整java.library.path

tweaking java.library.path

您还可以使用注释中提到的解决方案，例如将dll复制到 C：\tmp 中，并使用参数运行：

You may also go with a solution mentioned in comments, for example, copy dlls into C:\tmp and run with argument:

-Djava.library.path="C:\tmp;${env_var:PATH}"

但是因为两个dll之间有一个依赖关系，所以 C：\tmp code> PATH 。否则仍然有 UnsatisfiedLinkError 。手动加载 uuirtdrv.dll 应该有帮助，例如：

But since there is a dependency between the two dlls, C:\tmp must be on PATH. Otherwise there is still UnsatisfiedLinkError. Manually loading uuirtdrv.dll should help, ie:

import util.USBUIRT;
public class Uirt {
    static {
        System.loadLibrary("uuirtdrv");
    }

public static void main(String[] args) {
    String code = "0000";   
    try {
        USBUIRT.transmitIR(code, 2, 3, 2);
    } catch (Exception e) {
        e.printStackTrace();
    }
  }
}

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