private bool hasFullPacket()
{
bool result = false;
int byteCount = port.BytesToRead;
byte[] bytesRead;
if (readPacket.Count > 0 && byteCount > 0) //if the readPacket already has values and the input buffer has bytes to read
{
if (byteCount > readPacket.ElementAt(1))
{
bytesRead = new byte[readPacket.ElementAt(1) + 1];
port.Read(bytesRead, 0, readPacket.ElementAt(1) + 1);
readPacket.AddRange(bytesRead);
result = true;
}
}
else if (byteCount > 2) //if the input buffer has bytes to read and you get here then we start filling the readPacket
{
bytesRead = new byte[2];
port.Read(bytesRead, 0, 2);
if (bytesRead[0] == 0xD5) //checks for start bit from printer
{
readPacket.AddRange(bytesRead);
if (readPacket.ElementAt(1) < byteCount) //checks packet size against how full the buffer is
{
bytesRead = new byte[readPacket.ElementAt(1) + 1];
port.Read(bytesRead, 0, readPacket.ElementAt(1) + 1);
readPacket.AddRange(bytesRead);
result = true;
}
}
else
{
if (bytesRead[1] == 0xD5) //checks for start bit in second spot in case we somehow got a stray bit in here somehow
{
readPacket.Add(bytesRead[1]); //Add the start bit and retrieve packet length from the buffer (may need to check buffer size before reading)
bytesRead = new byte[1];
port.Read(bytesRead, 0, 1);
readPacket.Add(bytesRead[0]);
if (readPacket.ElementAt(1) < byteCount) //checks packet size against how full the buffer is
{
bytesRead = new byte[readPacket.ElementAt(1) + 1];
port.Read(bytesRead, 0, readPacket.ElementAt(1) + 1);
readPacket.AddRange(bytesRead);
result = true;
}
}
}
}
return(result);
}
