Appending data to DA.SetDataList()

Replies to This Discussion

Permalink Reply by Andy Payne on October 15, 2012 at 5:49pm

I would create a global variable, outside of the Solve Instance routine to be of whatever type the variable you want to store (it looks like you're trying to store a string).  So something like this:

List<string> foo = new List<string>();

Then, inside your Solve Instance routine, just use the add function to add whatever you want to each item.  You've pretty much already got the code for this:

foo.Add(variable[i] + "\n");  //this is assuming you're putting this inside a loop where i is changing

Then, just set the output to use this list.

 

DA.SetDataList(0, foo);

Is this what you were looking for?

Permalink Reply by Arthur Mamou-Mani on October 16, 2012 at 8:58am

Thanks a lot Andy,

 

I am very glad that you replied to this question as I am dealing with the SerialPort() methods and you created a component using them with Firefly. The problem here might be more complicated than it seems as I have an event and a subscriber method receiving data from a serial port.

In the code below, the strings received within myReceivedLines appear when connecting with the serial port (when connecttodevice is true). However they disapear when I launch another command (when homeallis true).

 

As you recommended in your reply, I have added the field called myReceivedLineswithin the class so that I could use the method String.Add() to all the feedback received and commands sent.

 

Why does the feedback dispear when a command is sent? Is the string going to myReceivedLine disappearing because they happen within a subscriber method or is it related to the DA.SetDataList() method used to assign myReceivedLinesto the output?

 

Many thanks!

 

 

public class SendToPrintComponent : GH_Component
    {
        //Fields
        List<string> myReceivedLines = new List<string>();
        SerialPort port;

        //subscriber method for the port.DataReceived Event
        private void DataReceivedHandler(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
        {
            SerialPort sp = (SerialPort)sender;
            while (sp.BytesToRead > 0)
            {
                try
                {
                    myReceivedLines.Add(sp.ReadLine());
                }
                catch (TimeoutException)
                {
                    break;
                }
            }
        }

        protected override void SolveInstance(IGH_DataAccess DA)
        {
           //Opening the port
            if (port == null)
            {
                string selectedportname = default(string);
                DA.GetData(1, ref selectedportname);
                int selectedbaudrate = default(int);
                DA.GetData(2, ref selectedbaudrate);


                //Assigning an object to the field within the SolveInstance method()
                port = new SerialPort(selectedportname, selectedbaudrate, Parity.None, 8, StopBits.One);

                //Enables the data terminal ready (dtr) signal during serial communication (handshaking)
                port.DtrEnable = true;
                port.WriteTimeout = 500;
                port.ReadTimeout = 500;
            }

            //Event Handling Method
            bool connecttodevice = default(bool);
            DA.GetData(3, ref connecttodevice);

            if (connecttodevice == true)
            {
                if (!port.IsOpen)
                {
                    port.DataReceived += new SerialDataReceivedEventHandler(DataReceivedHandler);
                    DA.SetDataList(0, myReceivedLines);
                    port.Open();

                }
            }
            else
            if (port.IsOpen)
                {
                    port.DataReceived -= new SerialDataReceivedEventHandler(DataReceivedHandler);
                    port.Close();
                }


            if (port.IsOpen)
            {
                DA.SetData(1, "Port Open");
            }

            //If the port is open do all the rest
            if (port.IsOpen)
            {
                bool homeall = default(bool);
                DA.GetData(5, ref homeall);


                //Home all sends all the axis to the origin
                if (homeall == true)
                {
                    port.Write("G28" + "\n");
                    myReceivedLines.Add("G28" + "\n");
                    DA.SetDataList(2, myReceivedLines);
                }

            }
            else
            {
                DA.SetData(1, "Port Closed");
            }
        }
}