lib/hidapi/engine.rb
def open(vendor_id, product_id, serial_number = nil, options = {})
      dev = get_device(vendor_id, product_id, serial_number, options)
      dev.open if dev
    end
def open(vendor_id, product_id, serial_number = nil, options = {})
      dev = get_device(vendor_id, product_id, serial_number, options)
      dev.open if dev
    end
def open ( vendor_id , product_id , serial_number = nil , options = { } ) dev = get_device ( vendor_id , product_id , serial_number , options ) dev . open if dev end
Opens the first device with the specified vendor_id, product_id, and optionally serial_number.
Opens the first device with the specified vendor_id product_id and optionally serial_number .