public void ReadFromPrinter()
{
Thread.CurrentThread.CurrentCulture = CultureInfo.InvariantCulture;
timeSinceLastReadAnything.Restart();
// we want this while loop to be as fast as possible. Don't allow any significant work to happen in here
while (CommunicationState == CommunicationStates.AttemptingToConnect
|| (PrinterIsConnected && serialPort.IsOpen && !Disconnecting))
{
try
{
while (serialPort.BytesToRead > 0)
{
char nextChar = (char)serialPort.ReadChar();
using (TimedLock.Lock(this, "ReadNextChar"))
{
if (nextChar == '\r' || nextChar == '\n')
{
lastLineRead = lineBeingRead;
lineBeingRead = "";
// process this command
{
StringEventArgs currentEvent = new StringEventArgs(lastLineRead);
CommunicationUnconditionalFromPrinter.CallEvents(this, currentEvent);
FoundStringEventArgs foundResponse = new FoundStringEventArgs(currentEvent.Data);
ReadLineStartCallBacks.CheckForKeys(foundResponse);
ReadLineContainsCallBacks.CheckForKeys(foundResponse);
if (foundResponse.SendToDelegateFunctions)
{
ReadLine.CallEvents(this, currentEvent);
}
}
if (CommunicationState == CommunicationStates.AttemptingToConnect)
{
CommunicationState = CommunicationStates.Connected;
}
}
else
{
lineBeingRead += nextChar;
}
timeSinceLastReadAnything.Restart();
}
}
Thread.Sleep(1);
}
catch (TimeoutException)
{
}
catch (IOException)
{
OnConnectionFailed(null);
}
catch (InvalidOperationException)
{
// this happens when the serial port closes after we check and before we read it.
}
catch (UnauthorizedAccessException)
{
OnConnectionFailed(null);
}
}
}
void WriteToPrinter(string lineToWrite, string lineWithoutChecksum)
{
if (PrinterIsConnected || CommunicationState == CommunicationStates.AttemptingToConnect)
{
if (serialPort != null && serialPort.IsOpen)
{
// write data to communication
{
StringEventArgs currentEvent = new StringEventArgs(lineToWrite);
CommunicationUnconditionalToPrinter.CallEvents(this, currentEvent);
if (lineWithoutChecksum != null)
{
FoundStringEventArgs foundStringEvent = new FoundStringEventArgs(lineWithoutChecksum);
WriteLineStartCallBacks.CheckForKeys(foundStringEvent);
WriteLineContainsCallBacks.CheckForKeys(foundStringEvent);
if (foundStringEvent.SendToDelegateFunctions)
{
WroteLine.CallEvents(this, currentEvent);
}
}
}
try
{
timeSinceLastReadAnything.Restart();
timeHaveBeenWaitingForOK.Restart();
serialPort.Write(lineToWrite);
}
catch (IOException)
{
OnConnectionFailed(null);
}
catch (TimeoutException)
{
}
}
else
{
OnConnectionFailed(null);
}
}
}
