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Thread: Java USB detection

  1. #1
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    Default Java USB detection

    Hello

    Currently, I am trying to use JD2XX class to retrieve a listing of the USB devices on my computer, but I cannot get past a certain point. When I try to run TestingUSB, I get the following error:

    Exception in thread "main" java.lang.UnsatisfiedLinkError: E:\NY\NY eclipse indigo\workspace\jd2xx\JD2XX.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 jd2xx.JD2XX.<clinit>(JD2XX.java:506)
    at TestingUSB.main(TestingUSB.java:8)
    I have uploaded a .zip file of my Project, called "The Project". TestingUSB is supposed to do is display a list of USB devices connected to your computer by description.

    Also, I am using Eclipse Indigo.

    Basically, my question is: How do I get Eclipse to recognize the JD2XX.dll file that is in the \src folder for The Project?

    Sorry, I just realized this was put in the wrong forum, can I get a mod to move it please?
    Attached Files Attached Files
    Last edited by wrightm96; October 11th, 2011 at 03:29 PM.


  2. #2
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    Default Re: Java USB detection

    Please use [highlight=Java] code [/highlight] tags when posting your code.
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  3. The Following User Says Thank You to JavaPF For This Useful Post:

    wrightm96 (October 12th, 2011)

  4. #3
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    Default Re: Java USB detection

    Thanks a lot. I got it working! Only problem now is the jd2xx isn't actually getting USB devices. Do you know if jd2xx class gets just USB, or also USB 2.0?

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    Default Re: Java USB detection

    Hello friends!

    I got your project.zip for list the Devices usb
    I'm trying get the printer usb but, I have very difficulty ...

    When executed your project, I got Exception like you .
    Exception in thread "main" java.lang.UnsatisfiedLinkError: E:\NY\NY eclipse indigo\workspace\jd2xx\JD2XX.dll: Can't find dependent libraries
    Would you like to help please ?

    What's the dependent library is that ?

    Thks!
    Best Regards

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    Default Re: Java USB detection

    Quote Originally Posted by jhieiy View Post
    Hello friends!

    I got your project.zip for list the Devices usb
    I'm trying get the printer usb but, I have very difficulty ...

    When executed your project, I got Exception like you .


    Would you like to help please ?

    What's the dependent library is that ?

    Thks!
    Best Regards
    You both probably don't truly understand the JAVA environment concept. This concept is simple and easy to forget.
    a) JVM and its library: Here are the bin and lib must be set in your PATH and CLASSPATH
    b) YOUR environment: Your compiled classes must be included in CLASSPATH and your NON-Java codes (e.g. dll) in PATH
    c) the OS environment: The OS conventions (e.g. backslash, pathseperator, etc.)

    Now to your problem: see the following setting
    D:\Test>set CLASSPATH=.\classes;.\classes\jd2xx;c:\program Files\Java\jre6\lib;
     
    D:\Test>javac -g:none -nowarn  -d .\classes  *.java
     
    D:\Test>java -Djava.library.path=.\classes\jd2xx TestingUSB
    Created jd2xx.JD2XX!
    Getting devices!
    Got devices!
    Displayed devices!
     
    D:\Test>
    the 1st line: set the JVM and Your environment CLASSPAT
    the 2nd line: compiling
    the 3rd line: exceute the code
    the rest: outputs....

  7. #6
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    Default Re: Java USB detection

    ...-Djava.library.path=.\classes\jd2xx tells JVM where to look for the requested .dll. This is usefull if you don't want to set PATH=...

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