How to read from a usb rfid reader?

Question

I have bought a usb rfid reader. How can I read data when user puts an rfid tag in front of the device?

my computer identifies the device as an Human Interface Devic

Answer 1

Please see: How do I read input from a USB HID device?

The device might enumerate as generic HID but might behave like a keyboard. If so, it should just type out the characters it reads. If not, you'll have to poll it from the driver. That link should help.