If it is a HID device, you'll need to read and understand the HID spec to
talk to it.
On Tue, Sep 15, 2009 at 8:53 PM, Ruperto Durano <rupertsoft...@yahoo.com>wrote:
> Greetings!
>
> Thank you very much for your immediate response.
>
> I'm so sorry for I'm not able to provide you ample information about what
> I'm doing. I'm not so sure about it myself. What I'm sure is, I'm trying
> to communicate to a barcode scanner. I don't know how to get the
> information for the CLASS and PROTOCOL. All I know that it is using the USB
> protocol.
>
> And I guess you are right about the HID device. If that is so, is there a
> possibility that we could ommit the reportID number for its reply? so that I
> could get the exact 64 bytes reply from the scanner? because according to
> javax, syncSubmit has no limit except that it should not exceed the
> wMaxPacketSize(). and
> usbPipe.getUsbEndpoint().getUsbEndpointDescriptor().wMaxPacketSize() is
> always equal to 64 for the scanner. And for every command that I sent,
> there are different first byte as well but the same first byte for a
> particular command.
>
> If you need some more information, please guide me on what to do so that I
> could provide you with the right information.
>
> Thank you very much again.
>
> Thanks,
> Ruperts
>
> ------------------------------
> *From:* Dan Streetman <ddstr...@ieee.org>
> *To:* Ruperto Durano <rupertsoft...@yahoo.com>
> *Cc:* javax.usb development <javax-usb-devel@lists.sourceforge.net>
> *Sent:* Wednesday, September 16, 2009 12:26:39 AM
> *Subject:* Re: Help on JAVAX
>
> Considering you are sending a CLASS request but have not mentioned what
> your device is nor what its class is nor what the protocol may be, why would
> you expect me to be able to help?
>
> If I had to take a completely wild guess, obviously without knowing
> anything about your device, its class or protocol, or what the specific
> response you are looking for or getting back is, I would *assume* you have a
> HID device and you don't realize that HID reports have the report ID number
> as the first byte, with the actual report data following. But again that is
> *completely* a guess made with *no* actual information about your situation.
>
> On Tue, Sep 15, 2009 at 2:14 AM, Ruperto Durano
> <rupertsoft...@yahoo.com>wrote:
>
>> Hello Dan,
>>
>> This is with regards to Java USB API --- javax.
>>
>> I had a hard time figuring out why there is an extra data acquired during
>> the usbPipe.syncSubmit(byte[]). The first byte of the array shouldn't be
>> there. Do you have any idea what happened?
>>
>> I opened a the pipe then send a command through
>> device.asyncSubmit(usbControlIrp);
>> with these settings for the usbControlIrp:
>> byte bmRequestType = UsbConst.REQUESTTYPE_TYPE_CLASS | UsbConst.
>> REQUESTTYPE_RECIPIENT_INTERFACE;
>> byte bRequest = 0x09;
>> short wValue = 2 << 8;
>> short wIndex = UsbUtil.unsignedShort(usbInterface.
>> getUsbInterfaceDescriptor().bInterfaceNumber());
>>
>> Then get the reply from the device through usbPipe.syncSubmit(byte[]).
>>
>> I am not getting the exact data since the first byte is unexpected the
>> rest are ok except that the last, expected, byte of the array is missing
>> due to the occurrence of the unexpected first byte.
>>
>> I can tell that it is unexpected because I know what the device should
>> have replied.
>>
>> Please help. I know I'm missing something like sending a controlled IRP
>> instead during getting of the reply, if so, settings for the controlled IRP
>> is another problem for me. Or could it be the settings of the usbControlIrp
>> during the sending of the command?
>>
>> Please Help.
>>
>> Thanks,
>> Ruperts
>>
>>
>
>
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