private async void NfcService_OnNfcTagRead(object sender, NfcTagInfo e)
{
nfcService.StopReadingTag();
btnRead.IsEnabled = true;
Device.BeginInvokeOnMainThread(() => lbState.Text = "NFC card read");
await ShowNfcMessage(e.Records.FirstOrDefault());
}
private void ManageReadOperation()
{
//TODO 2. READING CARD 5
NfcTagInfo nTag = GetNfcTagInfo(currentTag);
OnNfcTagRead?.Invoke(this, nTag);
currentIntent = null;
}
public void start()
{
g_TagCB.onTagArrival = (IntPtr unmanagedAddr) =>
{
NfcTagInfo g_tagInfos = new NfcTagInfo();
g_tagInfos = (NfcTagInfo)Marshal.PtrToStructure(unmanagedAddr, typeof(NfcTagInfo));
byte[] uidArray = new byte[g_tagInfos.uid_length];
for (int i = 0; i < g_tagInfos.uid_length; i++)
{
uidArray[i] = g_tagInfos.uid[i];
}
string uidString = BitConverter.ToString(uidArray).Replace("-", "");
Console.WriteLine("Tag arrived! ID: {0}", uidString);
if (readerMode == READER_MODE_IDLE)
{
if (!findUser(uidString))
{
Console.WriteLine("Cannot find user");
createAccessRequest(uidString, false);
}
else
{
Console.WriteLine("User found!");
createAccessRequest(uidString, true);
}
}
else if (readerMode == READER_MODE_WRITE_KEY)
{
if (!createUser(uidString))
{
Console.WriteLine("Cannot create user");
}
else
{
Console.WriteLine("User created!");
}
}
};
g_TagCB.onTagDeparture = () =>
{
Console.WriteLine("Tag departed!");
};
IntPtr unmanagedAddr = Marshal.AllocHGlobal(Marshal.SizeOf(g_TagCB));
Marshal.StructureToPtr(g_TagCB, unmanagedAddr, true);
nfcManager_doInitialize();
nfcManager_registerTagCallback(unmanagedAddr);
nfcManager_enableDiscovery(-1, 0x01, 0, 0);
Console.Write("NFC poll started!\n");
}
private void OnNdefRed(NFCNdefMessage message, NSError error)
{
if (message == null)
{
OnNfcTagRead?.Invoke(this, null);
return;
}
NfcTagInfo tagInfo = new NfcTagInfo();
tagInfo.Records = GetRecords(message.Records);
OnNfcTagRead?.Invoke(this, tagInfo);
}
private NfcTagInfo GetNfcTagInfo(Tag tag)
{
if (tag == null)
{
return(null);
}
Ndef ndef = Ndef.Get(tag);
NfcTagInfo nTag = new NfcTagInfo();
if (ndef != null)
{
if (ndef.CachedNdefMessage != null)
{
NdefMessage ndefMessage = ndef.CachedNdefMessage; //TODO 2. READING CARD 6 ndef.NdefMessage -> TagLost
var records = ndefMessage.GetRecords();
nTag.Records = GetRecords(records);
}
}
return(nTag);
}
