[javax-usb-devel] can not send requests

[Ajay S. <gnr...@gm...>]

I am trying to communicate with usb webcam.While sniffing with usb
sniffer under request column I found strange requests,and I can not
send them using usb4j api.These are(exact words under request column
in usb sniffer )
1.Class Interface
2.Select Interface
3.Set Power
While using device.createUsbControlIrp() and
device.syncSubmit(usbcontrolirp) sniffer always shows 'control
transfer' text under request column.And I can not copy above 3 in
anyway with this
So why & what are these requests and how can I issue them?