How to get NT device name of a USB printer

Hi! friends,
I need to know how can we get the NT device name of a USB printer. Actually
I m writting a layered driver where we have to pass
the device name to get the lower device object pointer by calling
IoGetDeviceObjectPointer(…) call. In this call the first parameter is the
device name. I m working on USB printers, where I have to get the printer
device name created by its class driver or usb printer driver. So that I
can communicate with that driver and pass some IRP to the lower drivers.
Please help me out in this regard. I will be looking forward for ur help.
Thank u very much…

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