[ruby-ffi] libnfc example troubles

Hi everyone.

i need some backup to get going with my project trying to make ruby-wrapper for libnfc:

Test program(trying to simulate this c example:):

require 'ffi'
load '~/Documents/nfc/nfc_library.rb'

device_ptr = FFI::MemoryPointer.new :pointer
context_ptr = FFI::MemoryPointer.new :pointer
target = NfcLibrary::NfcTarget.new

NfcLibrary::nfc_init(context_ptr)
device_ptr = NfcLibrary::nfc_open(context_ptr.read_pointer, nil)

NfcLibrary::nfc_initiator_init(device_ptr)

nmMifare = NfcLibrary::NfcModulation.new
nmMifare[:nmt] = :NMT_ISO14443A
nmMifare[:nbr] = :NBR_106

device_name = NfcLibrary::nfc_device_get_name(device_ptr)

puts device_name

NfcLibrary::nfc_initiator_select_passive_target(device_ptr, nmMifare, nil, 0, target.pointer)

Output of testprogram(connecting to nfc interface but will call the last method with succes) :

ACS / ACR122U PICC Interface
-2

My FFI library:

module NfcLibrary
extend FFI::Library
ffi_lib '/usr/local/Cellar/libnfc/1.7.0-rc1/lib/libnfc.4.dylib'

typedef :pointer, :nfc_device
typedef :pointer, :nfc_context
enum :NfcModulationType,
[:NMT_ISO14443A, 1,
:NMT_JEWEL,
:NMT_ISO14443B,
:NMT_ISO14443BI,
:NMT_ISO14443B2SR,
:NMT_ISO14443B2CT,
:NMT_FELICA,
:NMT_DEP]

enum :NfcBaudRate,
[:NBR_UNDEFINED, 0,
:NBR_106,
:NBR_212,
:NBR_424,
:NBR_847]

class NfcIso14443aInfo < FFI::Struct
layout :abtAtqa, :uint8, 2,
:btSak, :uint8,
:szUidLen, :size_t,
:abtUid, :uint8, 10,
:szAtsLen, :size_t,
:abtAts, :uint8, 254
end

class NfcTargetInfo < FFI::Union
layout :nai, NfcLibrary::NfcIso14443aInfo
# :nfi, :nfc_felica_info,
# :nbi, :nfc_iso14443b_info,
# :nii, :nfc_iso14443bi_info,
# :nsi, :nfc_iso14443b2sr_info,
# :nci, :nfc_iso14443b2ct_info,
# :nji, :nfc_jewel_info,
#:ndi, :nfc_dep_info

end

class NfcModulation < FFI::Struct
layout :nmt, :NfcModulationType,
:nbr, :NfcBaudRate
end

class NfcTarget < FFI::Struct
layout :nfc_target_info, NfcLibrary::NfcTargetInfo,
:nfc_modulation, NfcLibrary::NfcModulation
end

attach_function :nfc_init, [:pointer], :void
attach_function :nfc_target_init, [:pointer, :pointer, :pointer, :size_t, :int], :int
attach_function :nfc_open, [:pointer, :string], :pointer
attach_function :nfc_close, [:pointer], :void
attach_function :nfc_list_devices, [:pointer, :string, :int], :int
attach_function :nfc_initiator_init, [:pointer], :int
attach_function :nfc_device_get_name, [:pointer], :string
attach_function :nfc_initiator_select_passive_target, [:pointer, NfcLibrary::NfcModulation, :pointer, :size_t, :pointer], :int
end

Header function that i am trying to implement:

NFC_EXPORT int nfc_initiator_select_passive_target(nfc_device *pnd, const nfc_modulation nm, const uint8_t *pbtInitData, const size_t szInitData, nfc_target *pnt);

The c example program are running flawlessly and i am connecting to the nfc interface, but somehow the last method is attached wrong but how?

I have been stucked here for some days now trying to figure out why my rb test program will not call the method properbly, when the c version works great.

Any help will be much appreciated.

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