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 -- View this message in context: http://www.nabble.com/Mono-C--Serial-Port-problem-tp17241892p17241892.html Sent from the Mono - Dev mailing list archive at Nabble.com. _______________________________________________ Mono-devel-list mailing list Mono-devel-list@lists.ximian.com http://lists.ximian.com/mailman/listinfo/mono-devel-list