how to add hid4java to my project?

[mohamnexus]

Hi
I'm working on a java project in netbeans and i want to use usb hid, how can i add hid4java to my project?
Can i use jar file of hid4java for library?
please teach me step by step to add your library to my project.
Thanks

[gary-rowe]

Hi @mohamnexus. Thanks for your interest in hid4java. Can you verify that you've read the README and installation instructions? There is a step-by-step guide to building it in the wiki linked there.

If your project uses Maven it will be very straightforward. If not then you can use one of the pre-built releases here: https://github.com/gary-rowe/hid4java/releases

[mohamnexus]

Hi again
I can use hid4java in my project and send data to usb, but i couldn't get data from hid usb.
I want to use getReport() method , please help me.
Thanks

[gary-rowe]

Can you provide a code sample indicating what you're trying to do? There is extensive documentation on the API detailing how to use it.

[mohamnexus]

Skip my previous question.
Send data to USB with trezor.write(message, PACKET_LENGTH, (byte) 0);
and get feature report with trezor.getFeatureReport(data, (byte) 0 ); is working
but when i change report ID to 0x1 , i can send data but i can't get data from usb.
why?

[gary-rowe]

When you change the report ID in USB then it changes the function of the device. You need to consult the documentation that comes with it in order to correctly determine which reports are supported and what they do.

[mohamnexus]

Thanks for your reply.
I have an application for usb device test (SimpleHIDWrite) that supporting getFeatureReport with 0x01 report id but i couldn't use getFeatureReport with hid4java library.

but in hid4java

[gary-rowe]

Judging by the ArrayIndexOutOfBoundsException and the structure of the getFeatureReport method it seems that the hid_get_feature_report native method is returning the full data.length + 1 which is too large for the buffer.

You've probably found a bug.

Can you build a copy of hid4java using the develop branch code and try again? Remember to change the version to develop-SNAPSHOT in your Maven configuration.

[gary-rowe]

This bug has been fixed in release 0.4.0 so closing here

[frankmeho]

Hi @gary-rowe ,
As far as I know, GetReport mentioned by @mohamnexus is different from getFeatureReport.
I've used the latest hid4java-develop with develop-SNAPSHOT version and it works well on most of my handled projects using the USB HID interface to send/receive commands.
However, there're some specific platforms that require sending SetReport first and then sending another GetReport to obtain its results. It seems that the current hid4java-develop does not provide this GetReport API yet.