/// <summary>
/// Event raised when NDEF messages are detected
/// </summary>
/// <param name="session">iOS <see cref="NFCNdefReaderSession"/></param>
/// <param name="messages">Array of iOS <see cref="NFCNdefMessage"/></param>
public override void DidDetect(NFCNdefReaderSession session, NFCNdefMessage[] messages)
{
OnTagConnected?.Invoke(null, EventArgs.Empty);
if (messages != null && messages.Length > 0)
{
var first = messages[0];
var tagInfo = new TagInfo
{
IsWritable = false,
Records = GetRecords(first.Records)
};
OnMessageReceived?.Invoke(tagInfo);
}
OnTagDisconnected?.Invoke(null, EventArgs.Empty);
}
/// <summary>
/// Write or Clear a NDEF message
/// </summary>
/// <param name="tagInfo"><see cref="ITagInfo"/></param>
/// <param name="clearMessage">Clear Message</param>
/// <param name="makeReadOnly">Make tag read-only</param>
internal void WriteOrClearMessage(ITagInfo tagInfo, bool clearMessage = false, bool makeReadOnly = false)
{
try
{
if (_currentTag == null)
{
throw new Exception(Configuration.Messages.NFCErrorMissingTag);
}
if (tagInfo == null)
{
throw new Exception(Configuration.Messages.NFCErrorMissingTagInfo);
}
var ndef = Ndef.Get(_currentTag);
if (ndef != null)
{
try
{
if (!ndef.IsWritable)
{
throw new Exception(Configuration.Messages.NFCErrorReadOnlyTag);
}
if (ndef.MaxSize < NFCUtils.GetSize(tagInfo.Records))
{
throw new Exception(Configuration.Messages.NFCErrorCapacityTag);
}
ndef.Connect();
OnTagConnected?.Invoke(null, EventArgs.Empty);
NdefMessage message = null;
if (clearMessage)
{
message = GetEmptyNdefMessage();
}
else
{
var records = new List <NdefRecord>();
for (var i = 0; i < tagInfo.Records.Length; i++)
{
var record = tagInfo.Records[i];
if (GetAndroidNdefRecord(record) is NdefRecord ndefRecord)
{
records.Add(ndefRecord);
}
}
if (records.Any())
{
message = new NdefMessage(records.ToArray());
}
}
if (message != null)
{
ndef.WriteNdefMessage(message);
if (!clearMessage && makeReadOnly)
{
if (!MakeReadOnly(ndef))
{
Console.WriteLine("Cannot lock tag");
}
}
var nTag = GetTagInfo(_currentTag, ndef.NdefMessage);
OnMessagePublished?.Invoke(nTag);
}
else
{
throw new Exception(Configuration.Messages.NFCErrorWrite);
}
}
catch (Android.Nfc.TagLostException tlex)
{
throw new Exception("Tag Lost Error: " + tlex.Message);
}
catch (Java.IO.IOException ioex)
{
throw new Exception("Tag IO Error: " + ioex.Message);
}
catch (Android.Nfc.FormatException fe)
{
throw new Exception("Tag Format Error: " + fe.Message);
}
catch (Exception ex)
{
throw new Exception("Tag Error:" + ex.Message);
}
finally
{
if (ndef.IsConnected)
{
ndef.Close();
}
_currentTag = null;
OnTagDisconnected?.Invoke(null, EventArgs.Empty);
}
}
else
{
throw new Exception(Configuration.Messages.NFCErrorNotCompliantTag);
}
}
catch (Exception ex)
{
StopPublishingAndThrowError(ex.Message);
}
}
/// <summary> /// Event raised when a tag is connected /// </summary> /// <param name="sender">Object <see cref="ProximityDevice"/></param> void OnDeviceArrived(ProximityDevice sender) => OnTagConnected?.Invoke(null, EventArgs.Empty);
/// <summary>
/// Write or Clear a NDEF message
/// </summary>
/// <param name="tagInfo"><see cref="ITagInfo"/></param>
/// <param name="clearMessage">Clear Message</param>
internal void WriteOrClearMessage(ITagInfo tagInfo, bool clearMessage = false)
{
if (_currentTag == null)
{
throw new Exception("Tag error: No tag to write");
}
if (tagInfo == null)
{
throw new Exception("TagInfo error: No tag to write");
}
var ndef = Ndef.Get(_currentTag);
if (ndef != null)
{
try
{
if (!ndef.IsWritable)
{
throw new Exception("Tag is not writable");
}
if (ndef.MaxSize < NFCUtils.GetSize(tagInfo.Records))
{
throw new Exception("Tag is too small");
}
ndef.Connect();
OnTagConnected?.Invoke(null, EventArgs.Empty);
NdefMessage message = null;
if (clearMessage)
{
message = GetEmptyNdefMessage();
}
else
{
var records = new List <NdefRecord>();
for (var i = 0; i < tagInfo.Records.Length; i++)
{
var record = tagInfo.Records[i];
if (GetAndroidNdefRecord(record) is NdefRecord ndefRecord)
{
records.Add(ndefRecord);
}
}
if (records.Any())
{
message = new NdefMessage(records.ToArray());
}
}
if (message != null)
{
ndef.WriteNdefMessage(message);
var nTag = GetTagInfo(_currentTag, ndef.NdefMessage);
OnMessagePublished?.Invoke(nTag);
}
else
{
throw new Exception("nothing to write on tag");
}
}
catch (Android.Nfc.TagLostException tlex)
{
throw new Exception("Tag lost error: " + tlex.Message);
}
catch (Java.IO.IOException ioex)
{
throw new Exception("Tag IO error: " + ioex.Message);
}
catch (Android.Nfc.FormatException fe)
{
throw new Exception("Tag format error: " + fe.Message);
}
catch (Exception ex)
{
throw new Exception("Tag other error:" + ex.Message);
}
finally
{
if (ndef.IsConnected)
{
ndef.Close();
}
_currentTag = null;
OnTagDisconnected?.Invoke(null, EventArgs.Empty);
}
}
else
{
throw new Exception("Tag Error: NDEF is not supported");
}
}
