System Image Restoration

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  What exactly does this error mean:

  - Is my idea to have a dll generate an event for Matlab simply not possible?
  - Is there a mistake in my code?
  - Am I choosing the wrong approach, is tehre a better way?

  ----------------------------------------------------------------------------------------------------

  The ComInterface.dll code:

  using System;
  
  using System.IO.Ports;
  
  
  
  namespace ComInterface
  
  {
  
   // Prototype for MatLab callback function
  
   public delegate void AnswerEvent(object sender, string msg);
  
  
  
   public class RS232
  
   {
  
   static SerialPort port;
  
   public static AnswerEvent matlabCallback;
  
  
  
   // Function to setup and open the serial port
  
   public static SerialPort Open(string portName)
  
   {jutsu
  
   // Specify port settings
  
   port = new SerialPort(portName);
  
   port.BaudRate = 115200;
  
   port.Parity = Parity.Odd;
  
   port.StopBits = StopBits.One;
  
   port.Handshake = Handshake.None;
  
   port.ReadTimeout = 10;
  
   port.WriteTimeout = 10;
  
  
  
   // Open serial port
  
   if (! port.IsOpen)
  
   {
  
   port.Open();
  
   }
  
   
  
   // Clear runt buffer data
  
   port.DiscardInBuffer();
  
   port.DiscardOutBuffer();
  
  
  
   // Register serial port callback function
  
   port.DataReceived += new SerialDataReceivedEventHandler(port_DataReceived);
  
  
  
   // Just for debugging
  
   return port; 
  
   }
  
  
  
  
  
  
  
   // Function to read data from external device
  
   public static int ReadRegister(int addr, AnswerEvent fnc)
  
   {
  
   
  
   // Store Matlab callback function (could this be done differently?)
  
   matlabCallback = fnc;
  
  
  
   // Device stecific message protocol:
  
   // 1. Byte = Status (0x00 = Read)
  
   // 2. Byte = Address
  
   // 3.-6. Byte = 4 Byte Data
  
   byte[] sendMsg = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
  
   sendMsg[1] = Convert.ToByte(addr);
  
  
  
   // Send read request to device
  
   port.Write(sendMsg, 0, 6);
  
  
  
   // Just for debugging
  
   return 1;
  
   }
  
  
  
  
  
  
  
   // Callback function from serial port
  
   public static void port_DataReceived(object sender, SerialDataReceivedEventArgs e)
  
   {
  
   byte[] rcvMsg = new byte[6];
  
  
  
   // Read answer from external deice
  
   port.Read(rcvMsg, 0, 6);
  
  
  
   // Call event handler function in Matlab
  
   // => This leads to System error (Matlab crashes): ".NET unhandled exception: Asynchronous delegate invocation is not supported."
  
   matlabCallback(port, BitConverter.ToString(rcvMsg)); 
  
  
  
   // What happens here? Does program go to matlab and never come back? Is there another way to generate an event?
  
   // Better Question: Is MatLab still waiting to be called back???
  
   }
  
   }
  
  }

  Friday, May 27, 2011 5:50 PM