How to bind comport in c#.Net application.


1.    All process of the binding comport and recive data(both with richtext box and datarecieved event).


-         First i will talk about the what is comport and how it is used

-         Comport is one type of the commination port which is use to send and receive the data from the machine which is connected to computer with comport

-         When we want to use comport we have to bind this comport first then we use it.

-         Comport has some properties like board rate, parity bit, port numbered…

-         You can receive or send the data from the comport by two or more way here I explain two way

A.      receive the data by the comport data received event

 

A. using data received event

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;

using System.IO;

using System.IO.Ports;

 

namespace ComportExample

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }

        StringBuilder strbd;

       

        string tmpstr = "";

 

        private void btnBind_Click(object sender, EventArgs e)

        {

            initcomport();

           

        }

 

        void objPort_DataReceived(object sender, SerialDataReceivedEventArgs e)

        {

            SerialPort sp=(SerialPort)sender;

            string str = "";

            str=sp.ReadExisting();

            tmpstr = str;

          

 

 

        }

 

        private void makestring()

        {

            strbd.Append(tmpstr);

            tmpstr = "";

            if (strbd.Length>100)

            {

                MessageBox.Show(strbd.ToString());

            }

        }

 

    

        private void Form1_Load(object sender, EventArgs e)

        {

            getComport();

        }

 

        private void getComport()

        {

            string[] ports = SerialPort.GetPortNames();

            if (ports.Length > 0)

            {

                for (int i = 0; i < ports.Length; i++)

                {

                    cbComport.Items.Add(ports[i].ToString());

                }

                cbComport.SelectedIndex = 0;

 

            }

        }

 

        private void initcomport()

        {

            try

            {

                SerialPort objPort = new SerialPort();

                objPort.PortName = cbComport.Text;

                objPort.BaudRate = 9600;

                objPort.DataBits = 8;

                objPort.StopBits = 0;

                objPort.Parity = 0;

                objPort.Open();

 

                objPort.DataReceived += objPort_DataReceived;

            }

            catch (Exception ex)

            {

 

                MessageBox.Show(ex.Message);

            }

        }

 

 

 

    }

}

 

 

Descriptions:

1.    First we have to add two name space

 using System.IO;

     using System.IO.Ports;

 

2.    now we bind the all the comport available on your PC

 

        private void getComport()

        {

            string[] ports = SerialPort.GetPortNames();

            if (ports.Length > 0)

            {

                for (int i = 0; i < ports.Length; i++)

                {

                    cbComport.Items.Add(ports[i].ToString());

                }

                cbComport.SelectedIndex = 0;

 

            }

        }

3.  now for the comport first we have to assign this and bind the comport this is given below, also we open the comport after open command u use the comport

 

  SerialPort objPort = new SerialPort();

                objPort.PortName = cbComport.Text;

                objPort.BaudRate = 9600;

                objPort.DataBits = 8;

                objPort.StopBits = 0;

                objPort.Parity = 0;

             objPort.Open();

 

 

4.      now we are write some data to the comport it is give as

objPort.Write("OPEN");

if u want to pass enter key on the comport the write command like

objPort.Write("OPEN"+”\r\n”);

 

5.      on give the command on the comport we receive the text (data) from the comport so we create comport receive event for the receiving data from the comport

objPort.DataReceived += objPort_DataReceived;

   void objPort_DataReceived(object sender, SerialDataReceivedEventArgs e)

   {

            SerialPort sp=(SerialPort)sender;

            string str = "";

            str=sp.ReadExisting();

            tmpstr = str;

     makestring();

   }

   private void makestring()

   {

            strbd.Append(tmpstr);

            tmpstr = "";

            if (strbd.Length>100)

     {

                richTextBox1.AppendText(tmpstr);

                MessageBox.Show(strbd.ToString());

 

            }

   }


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