Java USB detection

**wrightm96** · October 11th, 2011, 10:30 AM

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?

**JavaPF** · October 12th, 2011, 05:59 PM

Hello..

These links should help you move forward:

java.lang.UnsatisfiedLinkError no *****.dll in java.library.path

How to set the java.library.path from Eclipse

**wrightm96** · October 12th, 2011, 09:08 PM

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?

**jhieiy** · July 20th, 2012, 12:31 PM

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

**Voodoo** · July 21st, 2012, 06:20 AM

Originally Posted by jhieiy

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....

**Voodoo** · July 21st, 2012, 06:27 AM

...-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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