public override void DidDetectTags(NFCNdefReaderSession session, INFCNdefTag[] tags)
{
try
{
var nFCNdefTag = tags[0];
session.ConnectToTag(nFCNdefTag, CompletionHandler);
string dominio = "http://boxweb.azurewebsites.net/";
string user = MainViewModel.GetInstance().User.UserId.ToString();
string tag_id = "";
string url = dominio + "index3.aspx?user_id=" + user + "&tag_id=" + tag_id;
NFCNdefPayload payload = NFCNdefPayload.CreateWellKnownTypePayload(url);
NFCNdefMessage nFCNdefMessage = new NFCNdefMessage(new NFCNdefPayload[] { payload });
nFCNdefTag.WriteNdef(nFCNdefMessage, delegate
{
session.InvalidateSession();
});
//Task task = App.DisplayAlertAsync(user_id_tag);
//AppDelegate.user_id_tag = "?";
//PopupNavigation.Instance.PopAsync();
//session.InvalidateSession();
//session.Dispose();
}
catch (Exception ex)
{
Console.WriteLine(ex);
session.Dispose();
session.InvalidateSession();
}
MainViewModel.GetInstance().Home = new HomeViewModel();
Xamarin.Forms.Application.Current.MainPage = new MasterPage();
}
/// <summary>
/// Returns an empty iOS <see cref="NFCNdefMessage"/>
/// </summary>
/// <returns>iOS <see cref="NFCNdefMessage"/></returns>
NFCNdefMessage GetEmptyNdefMessage()
{
var records = new NFCNdefPayload[1];
records[0] = GetEmptyPayload();
return(new NFCNdefMessage(records));
}
public void ReadValues(NFCNdefMessage message, NSError error)
{
try
{
if (MainPage.currentPage == "Read From Node") //If current page is read page
{
NFCNdefPayload messageRecord = message.Records[0];
ReadNFC.DisplayValues(messageRecord.Payload.ToArray()); //Encrypt nonce and create reply
Session.InvalidateSession();
}
else // If current page is write page
{
string test = "sjkdsakdjdksad";
//byte[] bytes = Encoding.ASCII.GetBytes(test);
byte[] bytes = WriteNFC.CreateRequest();
NFCNdefPayload writePayload = new NFCNdefPayload(NFCTypeNameFormat.Unknown, NSData.FromArray(new byte[0]), NSData.FromArray(new byte[0]), NSData.FromArray(bytes));
NFCNdefMessage writeMessage = new NFCNdefMessage(new NFCNdefPayload[] { writePayload });
tag.WriteNdef(writeMessage, delegate { Console.WriteLine("Write"); });
System.Threading.Thread.Sleep(300);
Session.InvalidateSession();
}
}
catch
{
Console.WriteLine("Did not contain a message");
}
}
public void DidDetectTags(NFCNdefReaderSession session, INFCNdefTag[] tags)
{
try
{
string user_id_tag = AppDelegate.user_id_tag;
if (user_id_tag == "?")
{
Task task = App.DisplayAlertAsync("¡Primero escanea este Tag para escribirlo!");
session.InvalidateSession();
session.Dispose();
AppDelegate.user_id_tag = "?";
}
else
{
if ((Convert.ToInt32(user_id_tag) == Convert.ToInt32(MainViewModel.GetInstance().User.UserId.ToString())) || (0 == Convert.ToInt32(user_id_tag)))
{
var nFCNdefTag = tags[0];
session.ConnectToTag(nFCNdefTag, CompletionHandler);
string dominio = "http://boxweb.azurewebsites.net/";
string user = MainViewModel.GetInstance().User.UserId.ToString();
string tag_id = "";
string url = dominio + "index3.aspx?user_id=" + user + "&tag_id=" + tag_id;
NFCNdefPayload payload = NFCNdefPayload.CreateWellKnownTypePayload(url);
NFCNdefMessage nFCNdefMessage = new NFCNdefMessage(new NFCNdefPayload[] { payload });
nFCNdefTag.WriteNdef(nFCNdefMessage, delegate
{
Console.WriteLine("ok");
});
//Task task = App.DisplayAlertAsync(user_id_tag);
}
else
{
Task task2 = App.DisplayAlertAsync("¡Este Tag esta vinculado con otro usuario!");
session.Dispose();
session.InvalidateSession();
AppDelegate.user_id_tag = "?";
}
AppDelegate.user_id_tag = "?";
PopupNavigation.Instance.PopAsync();
session.InvalidateSession();
_tagSession.InvalidateSession();
Thread.Sleep(4000);
}
}
catch (Exception ex)
{
Console.Write(ex);
modo_escritura = false;
}
}
private void ManageWriteTextOperation(NFCNdefReaderSession session, INFCNdefTag[] tags)
{
var nFCNdefTag = tags[0];
session.ConnectToTag(nFCNdefTag, (error) => OnNfcTagTextWriten(this, false));
NFCNdefPayload payload = NFCNdefPayload.CreateWellKnownTypePayload(textToWrite, NSLocale.CurrentLocale);
NFCNdefMessage nFCNdefMessage = new NFCNdefMessage(new NFCNdefPayload[] { payload });
nFCNdefTag.WriteNdef(nFCNdefMessage, delegate
{
OnNfcTagTextWriten(this, true);
});
}
/// <summary>
/// Returns ndef payload into MimeType
/// </summary>
/// <param name="payload"><see cref="NFCNdefPayload"/></param>
/// <returns>string</returns>
public static string ToMimeType(this NFCNdefPayload payload)
{
switch (payload.TypeNameFormat)
{
case NFCTypeNameFormat.NFCWellKnown:
if (payload.Type.ToString() == "T")
{
return("text/plain");
}
break;
case NFCTypeNameFormat.Media:
return(payload.Type.ToString());
}
return(null);
}
/// <summary>
/// Returns NDEF payload
/// </summary>
/// <param name="record"><see cref="NFCNdefRecord"/></param>
/// <returns><see cref="NFCNdefPayload"/></returns>
NFCNdefPayload GetiOSPayload(NFCNdefRecord record)
{
if (record == null)
{
return(null);
}
NFCNdefPayload payload = null;
switch (record.TypeFormat)
{
case NFCNdefTypeFormat.WellKnown:
var lang = record.LanguageCode;
if (string.IsNullOrWhiteSpace(lang))
{
lang = Configuration.DefaultLanguageCode;
}
var langData = Encoding.ASCII.GetBytes(lang.Substring(0, 2));
var payloadData = new byte[] { 0x02 }.Concat(langData).Concat(record.Payload).ToArray();
payload = new NFCNdefPayload(NFCTypeNameFormat.NFCWellKnown, NSData.FromString("T"), new NSData(), NSData.FromString(Encoding.UTF8.GetString(payloadData), NSStringEncoding.UTF8));
break;
case NFCNdefTypeFormat.Mime:
payload = new NFCNdefPayload(NFCTypeNameFormat.Media, record.MimeType, new NSData(), NSData.FromArray(record.Payload));
break;
case NFCNdefTypeFormat.Uri:
payload = NFCNdefPayload.CreateWellKnownTypePayload(NSUrl.FromString(Encoding.UTF8.GetString(record.Payload)));
break;
case NFCNdefTypeFormat.External:
payload = new NFCNdefPayload(NFCTypeNameFormat.NFCExternal, record.ExternalType, new NSData(), NSData.FromString(Encoding.UTF8.GetString(record.Payload), NSStringEncoding.UTF8));
break;
case NFCNdefTypeFormat.Empty:
payload = GetEmptyPayload();
break;
case NFCNdefTypeFormat.Unknown:
case NFCNdefTypeFormat.Unchanged:
case NFCNdefTypeFormat.Reserved:
default:
break;
}
return(payload);
}
private NfcNdefRecord[] GetRecords(NFCNdefPayload[] records)
{
NfcNdefRecord[] results = new NfcNdefRecord[records.Length];
for (var i = 0; i < records.Length; i++)
{
NFCNdefPayload record = records[i];
var ndefRecord = new NfcNdefRecord
{
TypeFormat = (NfcNdefTypeFormat)record.TypeNameFormat,
Uri = records[i].ToUri()?.ToString(),
MimeType = records[i].ToMimeType(),
Payload = record.Payload.ToByteArray()
};
results.SetValue(ndefRecord, i);
}
return(results);
}
/// <summary>
/// Returns NDEF payload
/// </summary>
/// <param name="record"><see cref="NFCNdefRecord"/></param>
/// <returns><see cref="NFCNdefPayload"/></returns>
NFCNdefPayload GetiOSPayload(NFCNdefRecord record)
{
if (record == null)
{
return(null);
}
NFCNdefPayload payload = null;
switch (record.TypeFormat)
{
case NFCNdefTypeFormat.WellKnown:
payload = NFCNdefPayload.CreateWellKnownTypePayload(Encoding.UTF8.GetString(record.Payload), NSLocale.CurrentLocale);
break;
case NFCNdefTypeFormat.Mime:
payload = new NFCNdefPayload(NFCTypeNameFormat.Media, record.MimeType, new NSData(), NSData.FromArray(record.Payload));
break;
case NFCNdefTypeFormat.Uri:
payload = NFCNdefPayload.CreateWellKnownTypePayload(NSUrl.FromString(Encoding.UTF8.GetString(record.Payload)));
break;
case NFCNdefTypeFormat.External:
payload = new NFCNdefPayload(NFCTypeNameFormat.NFCExternal, record.ExternalType, new NSData(), NSData.FromString(Encoding.UTF8.GetString(record.Payload), NSStringEncoding.UTF8));
break;
case NFCNdefTypeFormat.Empty:
payload = GetEmptyPayload();
break;
case NFCNdefTypeFormat.Unknown:
case NFCNdefTypeFormat.Unchanged:
case NFCNdefTypeFormat.Reserved:
default:
break;
}
return(payload);
}
/// <summary>
/// Returns Ndef payload into URI
/// </summary>
/// <param name="payload"><see cref="NFCNdefPayload"/></param>
/// <returns><see cref="Uri"/></returns>
public static Uri ToUri(this NFCNdefPayload payload)
{
switch (payload.TypeNameFormat)
{
case NFCTypeNameFormat.NFCWellKnown:
if (payload.Type.ToString() == "U")
{
var uri = payload.Payload.ParseWktUri();
return(uri);
}
break;
case NFCTypeNameFormat.AbsoluteUri:
case NFCTypeNameFormat.Media:
var content = Encoding.UTF8.GetString(payload.Payload.ToByteArray());
if (Uri.TryCreate(content, UriKind.RelativeOrAbsolute, out var result))
{
return(result);
}
break;
}
return(null);
}
/// <summary>
/// Converte an iOS <see cref="NFCNdefMessage"/> into an array of bytes
/// </summary>
/// <param name="message">iOS <see cref="NFCNdefMessage"/></param>
/// <returns>Array of bytes</returns>
public static byte[] ToByteArray(this NFCNdefMessage message)
{
var records = message?.Records;
// Empty message: single empty record
if (records == null || records.Length == 0)
{
records = new NFCNdefPayload[] { null };
}
var m = new MemoryStream();
for (var i = 0; i < records.Length; i++)
{
var record = records[i];
var typeNameFormat = record?.TypeNameFormat ?? NFCTypeNameFormat.Empty;
var payload = record?.Payload;
var id = record?.Identifier;
var type = record?.Type;
var flags = (byte)typeNameFormat;
// Message begin / end flags. If there is only one record in the message, both flags are set.
if (i == 0)
{
flags |= 0x80; // MB (message begin = first record in the message)
}
if (i == records.Length - 1)
{
flags |= 0x40; // ME (message end = last record in the message)
}
// cf (chunked records) not supported yet
// SR (Short Record)?
if (payload == null || payload.Length < 255)
{
flags |= 0x10;
}
// ID present?
if (id != null && id.Length > 0)
{
flags |= 0x08;
}
m.WriteByte(flags);
// Type length
if (type != null)
{
m.WriteByte((byte)type.Length);
}
else
{
m.WriteByte(0);
}
// Payload length 1 byte (SR) or 4 bytes
if (payload == null)
{
m.WriteByte(0);
}
else
{
if ((flags & 0x10) != 0)
{
// SR
m.WriteByte((byte)payload.Length);
}
else
{
// No SR (Short Record)
var payloadLength = (uint)payload.Length;
m.WriteByte((byte)(payloadLength >> 24));
m.WriteByte((byte)(payloadLength >> 16));
m.WriteByte((byte)(payloadLength >> 8));
m.WriteByte((byte)(payloadLength & 0x000000ff));
}
}
// ID length
if (id != null && (flags & 0x08) != 0)
{
m.WriteByte((byte)id.Length);
}
// Type length
if (type != null && type.Length > 0)
{
m.Write(type.ToArray(), 0, (int)type.Length);
}
// ID data
if (id != null && id.Length > 0)
{
m.Write(id.ToArray(), 0, (int)id.Length);
}
// Payload data
if (payload != null && payload.Length > 0)
{
m.Write(payload.ToArray(), 0, (int)payload.Length);
}
}
return(m.ToArray());
}
public AppleNdefRecord(NFCNdefPayload nativeRecord)
{
TypeNameFormat = GetTypeNameFormat(nativeRecord.TypeNameFormat);
Payload = nativeRecord.Payload.ToArray();
}
private static NdefRecord ParseNdefRecord(NFCNdefPayload payload)
{
string typeString = System.Text.Encoding.UTF8.GetString(payload.Type.ToArray());
var parsedRecord = new NdefRecord()
{
Id = System.Text.Encoding.UTF8.GetString(payload.Identifier.ToArray()),
RecordType = ParseRecordType(payload.TypeNameFormat, typeString)
};
switch (parsedRecord.RecordType)
{
case NdefRecordType.Url:
byte[] dataArray = payload.Payload.ToArray();
string urlText = string.Empty;
switch (dataArray[0])
{
case 1:
urlText = "http://www.";
break;
case 2:
urlText = "https://www.";
break;
case 3:
urlText = "http://";
break;
case 4:
urlText = "https://";
break;
}
urlText += System.Text.Encoding.UTF8.GetString(dataArray, 1, dataArray.Length - 1);
parsedRecord.Data = urlText;
break;
case NdefRecordType.AbsoluteUri:
parsedRecord.Data = typeString;
break;
case NdefRecordType.Text:
byte[] textDataArray = payload.Payload.ToArray();
byte header = textDataArray[0];
int languageLength = header & 0x1f;
parsedRecord.Encoding = (header & 0x40) == 0 ? "utf-8" : "utf-16be";
parsedRecord.Language = System.Text.Encoding.ASCII.GetString(textDataArray, 1, languageLength);
parsedRecord.Data = System.Text.Encoding.UTF8.GetString(textDataArray, languageLength + 1, textDataArray.Length - (languageLength + 1));
break;
case NdefRecordType.Mime:
parsedRecord.MediaType = typeString;
parsedRecord.Data = payload.Payload.ToArray();
break;
default:
parsedRecord.Data = payload.Payload.ToArray();
break;
}
return(parsedRecord);
}