public async Task ReadNdefMessage(Reader reader, NdefMessage message, byte userMemoryPage = 4)
{
byte[] com = { 0xff, 0xb0, 0x00, userMemoryPage, 0x00 };
ApduCommand command = new ApduCommand(com);
List <byte[]> receivedByte = new List <byte[]>();
ExecStatus success = ExecStatus.Error;
byte length = 0;
int index = 0;
await SendAPDUCommand(reader, command, (s, r, c, rec) =>
{
if (s == ExecStatus.Success)
{
receivedByte.Add(rec);
}
success = s;
});
if (success != ExecStatus.Success || receivedByte[index][0] != 0x03)
{
if (Global.SyncContext != null)
{
Global.SyncContext.Post((state) =>
{
ValueTuple <Reader, NdefMessage> t = (ValueTuple <Reader, NdefMessage>)state;
if (OnReadNdefMessage != null)
{
OnReadNdefMessage(false, t.Item1, t.Item2);
}
}, new ValueTuple <Reader, NdefMessage>(reader, message));
}
else
{
if (OnReadNdefMessage != null)
{
OnReadNdefMessage(false, reader, message);
}
}
return;
}
length = (byte)(receivedByte[index][1] + 2);
int currentLength = length - 16;
int numRead = 1;
while (currentLength > 0)
{
com[3] += 0x04;
command = new ApduCommand(com);
success = ExecStatus.Error;
await SendAPDUCommand(reader, command, (s, r, c, rec) =>
{
if (s == ExecStatus.Success)
{
receivedByte.Add(rec);
}
success = s;
numRead++;
});
if (success == ExecStatus.Success)
{
if (Global.SyncContext != null)
{
Global.SyncContext.Post((state) =>
{
ValueTuple <Reader, NdefMessage> t = (ValueTuple <Reader, NdefMessage>)state;
if (OnReadNdefMessage != null)
{
OnReadNdefMessage(false, t.Item1, t.Item2);
}
}, new ValueTuple <Reader, NdefMessage>(reader, message));
}
else
{
if (OnReadNdefMessage != null)
{
OnReadNdefMessage(false, reader, message);
}
}
return;
}
currentLength -= 16;
}
byte[] binary = new byte[numRead * 16];
for (int i = 0; i < receivedByte.Count; i++)
{
Array.Copy(receivedByte[i], 0, binary, 16 * i, 16);
}
message.FromBinaryData(binary);
if (Global.SyncContext != null)
{
Global.SyncContext.Post((state) =>
{
ValueTuple <Reader, NdefMessage> t = (ValueTuple <Reader, NdefMessage>)state;
if (OnReadNdefMessage != null)
{
OnReadNdefMessage(true, t.Item1, t.Item2);
}
}, new ValueTuple <Reader, NdefMessage>(reader, message));
}
else
{
if (OnReadNdefMessage != null)
{
OnReadNdefMessage(true, reader, message);
}
}
}
public async Task WriteNdefMessage(Reader reader, NdefMessage message, byte userMemoryPage = 4, byte writeUnitSize = 4)
{
byte[] binary = message.ToBinaryData();
int length = binary.Length;
ApduCommand command;
int currentIndex = 0;
int numWrite = 0;
while (length > 0)
{
byte[] com = new byte[6 + writeUnitSize];
com[0] = 0xff;
com[1] = 0xd6;
com[2] = 0x00;
com[3] = (byte)(userMemoryPage + numWrite);
com[4] = writeUnitSize;
int l = writeUnitSize;
if (length < l)
{
l = (byte)length;
}
Array.Copy(binary, currentIndex, com, 5, l);
command = new ApduCommand(com);
ExecStatus success = ExecStatus.Error;
await SendAPDUCommand(reader, command, (s, r, c, rec) =>
{
success = s;
});
if (success == ExecStatus.Error)
{
if (Global.SyncContext != null)
{
Global.SyncContext.Post((state) =>
{
ValueTuple <Reader, NdefMessage> t = (ValueTuple <Reader, NdefMessage>)state;
if (OnWriteNdefMessage != null)
{
OnWriteNdefMessage(false, t.Item1, t.Item2);
}
}, new ValueTuple <Reader, NdefMessage>(reader, message));
}
else
{
if (OnWriteNdefMessage != null)
{
OnWriteNdefMessage(false, reader, message);
}
}
return;
}
length -= writeUnitSize;
currentIndex += writeUnitSize;
numWrite++;
}
if (Global.SyncContext != null)
{
Global.SyncContext.Post((state) =>
{
ValueTuple <Reader, NdefMessage> t = (ValueTuple <Reader, NdefMessage>)state;
if (OnWriteNdefMessage != null)
{
OnWriteNdefMessage(true, t.Item1, t.Item2);
}
}, new ValueTuple <Reader, NdefMessage>(reader, message));
}
else
{
if (OnWriteNdefMessage != null)
{
OnWriteNdefMessage(true, reader, message);
}
}
}