Class: NFC::Reader
- Inherits:
-
Object
- Object
- NFC::Reader
- Defined in:
- lib/ruby-nfc/reader.rb
Instance Attribute Summary collapse
-
#ptr ⇒ Object
readonly
Returns the value of attribute ptr.
Class Method Summary collapse
Instance Method Summary collapse
- #connect ⇒ Object
-
#discover(*card_types) ⇒ Object
Returns list of tags applied to reader.
-
#initialize(device_name) ⇒ Reader
constructor
A new instance of Reader.
- #poll(*card_types, &block) ⇒ Object
- #set_flag(name, value) ⇒ Object
- #to_s ⇒ Object
Constructor Details
#initialize(device_name) ⇒ Reader
Returns a new instance of Reader.
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# File 'lib/ruby-nfc/reader.rb', line 5 def initialize(device_name) @name = device_name @ptr = nil end |
Instance Attribute Details
#ptr ⇒ Object (readonly)
Returns the value of attribute ptr.
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# File 'lib/ruby-nfc/reader.rb', line 3 def ptr @ptr end |
Class Method Details
.all ⇒ Object
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# File 'lib/ruby-nfc/reader.rb', line 73 def self.all ptr = FFI::MemoryPointer.new(:char, 1024 * 10) len = LibNFC.nfc_list_devices(NFC.context, ptr, 10) if len <= 0 raise NFC::Error, "No compatible NFC readers found" else names = ptr.get_bytes(0, 1024 * len).split("\x00").reject {|e| e.empty?} names.map {|name| Reader.new(name)} end end |
Instance Method Details
#connect ⇒ Object
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# File 'lib/ruby-nfc/reader.rb', line 14 def connect @ptr ||= LibNFC.nfc_open(NFC.context, @name) raise NFC::Error.new('Cant connect to ' << @name) if @ptr.null? self end |
#discover(*card_types) ⇒ Object
Returns list of tags applied to reader
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# File 'lib/ruby-nfc/reader.rb', line 21 def discover(*card_types) # TODO: по правильному здесь надо делать низкоуровневый card_types.inject([]) do |, card_type| raise NFC::Error.new('Wrong card type') unless card_type.respond_to? :discover += card_type.discover(connect) end end |
#poll(*card_types, &block) ⇒ Object
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# File 'lib/ruby-nfc/reader.rb', line 29 def poll(*card_types, &block) connect LibNFC.nfc_initiator_init(@ptr) # we'll be initiator not a target set_flag(:NP_ACTIVATE_FIELD, false) set_flag(:NP_HANDLE_CRC, true) set_flag(:NP_HANDLE_PARITY, true) set_flag(:NP_AUTO_ISO14443_4, true) set_flag(:NP_ACTIVATE_FIELD, true) modulation = LibNFC::Modulation.new modulation[:nmt] = :NMT_ISO14443A modulation[:nbr] = :NBR_106 targets = FFI::MemoryPointer.new(:uchar, LibNFC::Target.size * 10) loop do res = LibNFC.nfc_initiator_list_passive_targets(@ptr, modulation, targets, 10) # iterate over all applied targets and iterate 0.upto(res - 1) do |i| target = LibNFC::Target.new(targets + i * LibNFC::Target.size) # iterate over requested card types for each target # notice that some targets can match several types i.e. # contactless credit cards (PayPass/payWave) with mifare chip # on board card_types.each do |card_type| if card_type.match?(target) tag = card_type.new(target, self) tag.connect(&block) # if this tag was marked as processed - continue with next tag break if target.processed? end end end # upto end # loop end |
#set_flag(name, value) ⇒ Object
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# File 'lib/ruby-nfc/reader.rb', line 10 def set_flag(name, value) LibNFC.nfc_device_set_property_bool(@ptr, name, value) end |
#to_s ⇒ Object
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# File 'lib/ruby-nfc/reader.rb', line 69 def to_s @name end |