[Mono-dev] Mono C# Serial Port problem
Alan_Chun
kokolee88 at hotmail.com
Wed May 14 18:02:17 EDT 2008
HI, currently I am porting a windows app to linux using Mono. I have some
difficulties to get the serial port work. here is the code(based on mono
website):
public static void Main(string[] args)
{
SerialPortTest myTest = new SerialPortTest();
myTest.Test();
}
private SerialPort mySerial;
// Constructor
public SerialPortTest()
{
}
public void Test()
{
Console.WriteLine("Begin");
if (mySerial != null)
if (mySerial.IsOpen)
mySerial.Close();
mySerial = new System.IO.Ports.SerialPort("COM3", 9600, Parity.Even,
7, StopBits.One);
mySerial.Open();
mySerial.DtrEnable = true;
mySerial.RtsEnable = true;
mySerial.Handshake = System.IO.Ports.Handshake.None;
mySerial.ReadTimeout = 400;
Thread t = new Thread(new ThreadStart(DataReceived));
t.Start();
string tmp = "5D.1";
SendData(tmp);
// Should output some information about your modem firmware
//Console.WriteLine("Baaa");
// Console.WriteLine(ReadData());
}
public void DataReceived()
{
while (true)
{
byte tmpByte = 255;
string rxString = "";
//int tot = mySerial.BytesToRead;
tmpByte = (byte)mySerial.ReadByte();
while (tmpByte != 255)
{
rxString += ((char)tmpByte);
mpByte = (byte)mySerial.ReadByte();
}
if (!string.IsNullOrEmpty(rxString))
Console.WriteLine(rxString);
}
//return rxString;
}
I ran this under windows using .netframwork run time, it is fine but under
mono I always got this exception:
Unhandled Exception: System.NullReferenceException: Object reference not set
to an instance of an object
at (wrapper managed-to-native)
System.IO.Ports.WinSerialStream:ClearCommError
(int,System.IO.Ports.CommStat&)
at System.IO.Ports.WinSerialStream.get_BytesToRead () [0x00000]
at System.IO.Ports.SerialPort.get_BytesToRead () [0x00000]
at (wrapper remoting-invoke-with-check)
System.IO.Ports.SerialPort:get_BytesToRead ()
at SerialPortTest.DataReceived () [0x00000]
I have also tried BytesToRead, Read, ReadByte, all of them are working fine
under windows using .net2.0 framwork. But once I use the mono runtime, the
nightmare begins.
Any help will be really apprecaited!
Thanks
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