private void ReadBytes(byte[] data, int offset, int count)
{
//DateTime startTime = DateTime.Now;
do
{
int bytesRead = serialPort.Read(data, offset, count);
offset += bytesRead;
count -= bytesRead;
//if ((DateTime.Now - startTime).Milliseconds > serialPort.ReadTimeout)
//{
// throw new Exception();
//}
if (bytesRead == 0)
{
serialPort.DiscardInBuffer();
break;
}
Thread.Sleep(1);
} while (count > 0);
if (count != 0)
{
throw new Exception();
}
}
void _readThreadStart()
{
int bytesToRead = 0;
byte[] readBuffer;
cardID = new string(null);
for (; ;)
{
bytesToRead = serialPort.BytesToRead;
if (bytesToRead > 0)
{
readBuffer = new byte[bytesToRead];
serialPort.Read(readBuffer, 0, bytesToRead);
for (int i = 0; i < readBuffer.Length; i++)
{
cardID += (char)readBuffer[i];
if (cardID.Length == ID_LENGTH)
{
if (cardID[0] != 2)
{
HandleChecksumError();
break;
}
//verify checksum
int cs = 0;
for (int x = 1; x < 10; x += 2)
{
cs ^= ASCIIToNum((char)cardID[x], (char)cardID[x + 1]);
}
if (cs != cardID[11])
{
HandleChecksumError();
break;
}
OnIDReadyEvent(this, cardID);
System.Threading.Thread.Sleep(100);
cardID = new string(null);
break;
}
}
}
System.Threading.Thread.Sleep(10);
}
}