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Using SerialPort::BaseStream for reading from serial port ... #8

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Using SerialPort::BaseStream for reading from serial port ... #8

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67 changes: 38 additions & 29 deletions SerialPortLib/SerialPort.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -26,6 +26,7 @@ You should have received a copy of the GNU General Public License
using System.Threading;

using NLog;
using System.IO;

namespace SerialPortLib
{
Expand Down Expand Up @@ -56,6 +57,9 @@ public class SerialPortInput
private object accessLock = new object();
private bool disconnectRequested = false;

byte[] buffer = new byte[2048];
Action kickoffRead = null;

#endregion

#region Public Events
Expand Down Expand Up @@ -85,6 +89,38 @@ public class SerialPortInput
/// <summary>
/// Connect to the serial port.
/// </summary>
public SerialPortInput()
{
kickoffRead = delegate
{
if (!IsConnected)
{
return;
}

_serialPort.BaseStream.BeginRead(buffer, 0, buffer.Length, delegate (IAsyncResult ar)
{
if (IsConnected)
{
try
{
int actualLength = _serialPort.BaseStream.EndRead(ar);
byte[] received = new byte[actualLength];
Buffer.BlockCopy(buffer, 0, received, 0, actualLength);
OnMessageReceived(new MessageReceivedEventArgs(received));
}
catch (IOException exc)
{
logger.Error(exc);
gotReadWriteError = true;
Thread.Sleep(1000);
}
kickoffRead();
}
}, null);
};
}

public bool Connect()
{
if (disconnectRequested)
Expand Down Expand Up @@ -262,36 +298,9 @@ private void HandleErrorReceived(object sender, SerialErrorReceivedEventArgs e)

private void ReaderTask()
{
while (IsConnected)
if (IsConnected)
{
int msglen = 0;
//
try
{
msglen = _serialPort.BytesToRead;
if (msglen > 0)
{
byte[] message = new byte[msglen];
//
int readbytes = 0;
while (_serialPort.Read(message, readbytes, msglen - readbytes) <= 0)
; // noop
if (MessageReceived != null)
{
OnMessageReceived(new MessageReceivedEventArgs(message));
}
}
else
{
Thread.Sleep(100);
}
}
catch (Exception e)
{
logger.Error(e);
gotReadWriteError = true;
Thread.Sleep(1000);
}
kickoffRead();
}
}

Expand Down