We Keep Coding

C# display a variable in a Textbox

i am sending Sensor information with a NUCLEOF411RE to my PC. I receive this data on the COM98 with a BaudRate of 115200. Now i want to program a Windows Application that will split my string and put it on my textboxes. until now i display the data with a Button_click event. It puts values on the Textboxes that actually are the real values. But if i move my Sensor and klick the button again there should be a lot more different values, but there are the same values on the textboxes. In addition i want to refresh the textboxes automatically and not with a button click.
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.IO.Ports;
namespace BNO080
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
getAvailablePorts();
}
public string comport;
SerialPort serial = new SerialPort();
void getAvailablePorts()
{
String[] ports = SerialPort.GetPortNames();
comboBox1.Items.AddRange(ports);
comport = comboBox1.Text;
}
private void button1_Click(object sender, EventArgs e)
{
try
{
if(comboBox1.Text=="" || textBox6.Text=="")
{
MessageBox.Show("Please Select Port Settings");
}
else
{
serial.PortName = comboBox1.Text;
serial.BaudRate = Convert.ToInt32(textBox6.Text);
serial.Parity = Parity.None;
serial.StopBits = StopBits.One;
serial.DataBits = 8;
serial.Handshake = Handshake.None;
serial.Open();
MessageBox.Show("connected!");
}
}
catch (UnauthorizedAccessException)
{
MessageBox.Show("Unauthorised Access");
}
}
private void button2_Click(object sender, EventArgs e)
{
textBox1.Clear();
textBox2.Clear();
textBox3.Clear();
textBox4.Clear();
textBox5.Clear();
MessageBox.Show("connection closed!");
serial.Close();
}
private void button3_Click(object sender, EventArgs e)
{
try
{
textBox5.Text = serial.ReadLine();
/*String[] Stringsizes = A.Split(new char[] {' '});
textBox1.Text = Stringsizes[0];
textBox2.Text = Stringsizes[1];
textBox3.Text = Stringsizes[2];
textBox4.Text = Stringsizes[3];*/
// textBox5.Text = A;
//Array.Clear(Stringsizes, 0, 3);
}
catch (Exception) { }
}
}
}
can someone help me?

Can you give more information why you use the Button_Click Event to read the text? Maybe it is a possible way for you to subscribe for the DataReceived-Event of the COM-port?
It would look something like this:
serial.DataReceived += new SerialDataReceivedEventHandler(DataReceivedHandler);
private static void DataReceivedHandler(object sender, SerialDataReceivedEventArgs e)
{
string receivedString = serial.ReadExisting();
//Do something here...
}

I'd do a couple things. First subscribe to the DataReceived event on the serial port. This event handler will get called when there is data available on the serial port. Then in the event handler you can read from the serial port and add it to your textbox. You can't add it directly (see the AppendText function) because the event handler is called with a different thread, only the UI thread can update UI components (or you'll get a cross-thread exception).
...
public Form1()
{
InitializeComponent();
getAvailablePorts();
// Subscribe to the DataReceived event. Our function Serial_DataReceived
// will be called whenever there's data available on the serial port.
serial.DataReceived += Serial_DataReceived;
}
// Appends the given text to the given textbox in a way that is cross-thread
// safe. This can be called by any thread, not just the UI thread.
private void AppendText(TextBox textBox, string text)
{
// If Invoke is required, i.e. we're not running on the UI thread, then
// we need to invoke it so that this function gets run again but on the UI
// thread.
if (textBox.InvokeRequired)
{
textBox.BeginInvoke(new Action(() => AppendText(textBox, text)));
}
// We're on the UI thread, we can append the new text.
else
{
textBox.Text += text;
}
}
// Gets called whenever we receive data on the serial port.
private void Serial_DataReceived(object sender,
SerialDataReceivedEventArgs e)
{
string serialData = serial.ReadExisting();
AppendText(textBox5, serialData);
}

Because i want to add an rotating 3D cube i decided to switch to WPF. I heard it is much easier to implement a 3D graphic there. So i copied my code to the new WPF project. But now i got already problems to visualize my values on the Textboxes. It doesnt work. It looks like the Evenhandler did not fire an event while receiving Data from the com port.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO.Ports;
using System.ComponentModel;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Data;
using System.Drawing;
namespace cube
{
/// <summary>
/// Interaktionslogik für MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
getAvailablePorts();
serial.DataReceived += Serial_DataReceived;
}
public bool button3clicked = false;
public bool button4clicked = false;
public bool button5clicked = false;
SerialPort serial = new SerialPort();
void getAvailablePorts()
{
List<string> Itemlist = new List<string>();
String[] ports = SerialPort.GetPortNames();
Itemlist.AddRange(ports);
comboBox1.ItemsSource = Itemlist;
}
private void button1_Click_1(object sender, EventArgs e)
{
try
{
if (comboBox1.Text == "" || textBox6.Text == "")
{
MessageBox.Show("Please Select Port Settings");
}
else
{
serial.PortName = comboBox1.Text;
serial.BaudRate = Convert.ToInt32(textBox6.Text);
serial.Parity = Parity.None;
serial.StopBits = StopBits.One;
serial.DataBits = 8;
serial.Handshake = Handshake.None;
serial.Open();
MessageBox.Show("connected!");
}
}
catch (UnauthorizedAccessException)
{
MessageBox.Show("Unauthorised Access");
}
}
private void button2_Click_1(object sender, EventArgs e)
{
textBox1.Clear();
textBox2.Clear();
textBox3.Clear();
textBox4.Clear();
textBox5.Clear();
MessageBox.Show("connection closed!");
serial.Close();
textBox1.Text = "test";
}
private void AppendText(string[] text)
{
try
{
textBox1.Text = text[0];
textBox2.Text = text[1];
textBox3.Text = text[2];
textBox4.Text = text[3];
}
catch (Exception) { }
}
private void Safe_Position1(TextBox tBr1, TextBox tBi1, TextBox tBj1, TextBox tBk1, string[] text)
{
if (button3clicked == true)
{
tBr1.Text = text[0];
tBi1.Text = text[1];
tBj1.Text = text[2];
tBk1.Text = text[3];
button3clicked = false;
}
}
private void Safe_Position2(TextBox tBr2, TextBox tBi2, TextBox tBj2, TextBox tBk2, string[] text)
{
if (button4clicked == true)
{
tBr2.Text = text[0];
tBi2.Text = text[1];
tBj2.Text = text[2];
tBk2.Text = text[3];
button4clicked = false;
}
}
private void Safe_Position3(TextBox tBr3, TextBox tBi3, TextBox tBj3, TextBox tBk3, string[] text)
{
if (button5clicked == true)
{
tBr3.Text = text[0];
tBi3.Text = text[1];
tBj3.Text = text[2];
tBk3.Text = text[3];
button5clicked = false;
}
}
private void Serial_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
string serialData = serial.ReadLine();
String[] text = serialData.Split(new char[] { ' ' });
AppendText(text);
Safe_Position1(textBox5, textBox7, textBox8, textBox9, text);
Safe_Position2(textBox10, textBox11, textBox12, textBox13, text);
Safe_Position3(textBox14, textBox15, textBox16, textBox17, text);
}
private void button3_Click(object sender, EventArgs e)
{
button3clicked = true;
}
private void button4_Click(object sender, EventArgs e)
{
button4clicked = true;
}
private void button5_Click(object sender, EventArgs e)
{
button5clicked = true;
}
}
}

SerialPorts: Send in Bytes or Characters? [duplicate]

This question already has answers here:
SerialPort not receiving any data
(3 answers)
Closed 7 years ago.
I am using a serial port application to send a command with Unicode control characters and am having no success. When I send the same command in hyperterminal or Putty the communication works so I am curious if these two programs write out an array of bytes or Unicode characters or even a string. If I mimic what they do, I might have success... Also I noticed that the serial port property I pulled out of the toolbox in Visual Studio was listed as using a different COM port that I write in my code, is this why I'm getting no response or does my code override that? When conducting loopback tests, I get the output of the correct command with the control characters as well so I cant figure out what I'm doing wrong. This is .NET 2.0 Framework FYI
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.IO.Ports;
using System.Threading;
namespace SimpleSerial
{
public partial class Form1 : Form
{
string RxString;
public Form1()
{
InitializeComponent();
}
private void buttonStart_Click(object sender, EventArgs e)
{
serialPort1.PortName = "COM3";
serialPort1.BaudRate = 9600;
serialPort1.Parity = Parity.None;
serialPort1.DataBits = 8;
serialPort1.StopBits = StopBits.One;
serialPort1.Handshake = Handshake.None;
serialPort1.ReadTimeout = 500;
serialPort1.WriteTimeout = 500;
serialPort1.Open();
if (serialPort1.IsOpen)
{
buttonStart.Enabled = false;
buttonStop.Enabled = true;
textBox1.ReadOnly = false;
}
}
const char STX = '\u0002';
const char ETX = '\u0003';
readonly string pull_shelf_104 = string.Format("{0}01P00104##{1}" , STX, ETX);
private byte[] WrapString(string pull_shelf_104)
{
return System.Text.Encoding.ASCII.GetBytes(pull_shelf_104);
}
private void linkLabel_HC1_100_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
{
if (serialPort1.IsOpen)
{
byte[] data = WrapString(pull_shelf_104);
serialPort1.Write(data, 0, data.Length);
}
}
private void buttonStop_Click(object sender, EventArgs e)
{
if (serialPort1.IsOpen)
{
serialPort1.Close();
buttonStart.Enabled = true;
buttonStop.Enabled = false;
textBox1.ReadOnly = true;
}
}
private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
if (serialPort1.IsOpen) serialPort1.Close();
}
private void DisplayText(object sender, EventArgs e)
{
textBox1.AppendText(RxString);
}
private void serialPort1_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
{
RxString = serialPort1.ReadExisting();
this.Invoke(new EventHandler(DisplayText));
}
}
}

The comments above helped me solve the issue, thank you for your help! I needed to enable both RTS and DTS in my code, listing the COM ports was not the issue although I'm sure it is in some cases. Here's my code for anyone with similar issues.
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.IO.Ports;
using System.Threading;
namespace SimpleSerial
{
public partial class Form1 : Form
{
string RxString;
public Form1()
{
InitializeComponent();
}
private void buttonStart_Click(object sender, EventArgs e)
{
serialPort1.PortName = "COM3";
serialPort1.BaudRate = 9600;
serialPort1.Parity = Parity.None;
serialPort1.DataBits = 8;
serialPort1.StopBits = StopBits.One;
serialPort1.Handshake = Handshake.None;
serialPort1.RtsEnable = true;
serialPort1.DtrEnable = true;
serialPort1.ReadTimeout = 2000;
serialPort1.WriteTimeout = 2000;
serialPort1.Open();
if (serialPort1.IsOpen)
{
buttonStart.Enabled = false;
buttonStop.Enabled = true;
textBox1.ReadOnly = false;
}
}
const char STX = '\u0002';
const char ETX = '\u0003';
readonly string pull_shelf_104 = string.Format("{0}01P00204##{1}" , STX, ETX);
private byte[] WrapString(string pull_shelf_104)
{
return System.Text.Encoding.ASCII.GetBytes(pull_shelf_104);
}
private void linkLabel_HC1_100_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
{
if (serialPort1.IsOpen)
{
byte[] data = WrapString(pull_shelf_104);
serialPort1.Write(data, 0, data.Length);
}
}
private void buttonStop_Click(object sender, EventArgs e)
{
if (serialPort1.IsOpen)
{
serialPort1.Close();
buttonStart.Enabled = true;
buttonStop.Enabled = false;
textBox1.ReadOnly = true;
}
}
private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
if (serialPort1.IsOpen) serialPort1.Close();
}
private void DisplayText(object sender, EventArgs e)
{
textBox1.AppendText(RxString);
}
private void serialPort1_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
{
RxString = serialPort1.ReadExisting();
this.Invoke(new EventHandler(DisplayText));
}
}
}

Serial port can't send out data

I'm doing a project on serial port.. but after i changed my serial comm port into combo box selection, i cant seems to transmit anything data out. here's my codes:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO.Ports;
namespace XSP
{
public partial class Form1 : Form
{
string RxString;
byte[] buffer = Encoding.UTF8.GetBytes("RxString");
public Form1()
{
InitializeComponent();
this.Load += Form1_Load;
serialPort1.DataReceived += new SerialDataReceivedEventHandler(serialPort1_DataReceived);
Console.ReadLine();
}
void Form1_Load(object sender, EventArgs e)
{
var serialPort1 = SerialPort.GetPortNames();
cbCommPorts.DataSource = serialPort1;
}
public static byte[] ConvertToBinary(string str)
{
System.Text.ASCIIEncoding encoding = new System.Text.ASCIIEncoding();
return encoding.GetBytes(str);
}
private void btnOpen_Click(object sender, EventArgs e)
{
if (cbCommPorts.SelectedIndex > -1)
{
MessageBox.Show(String.Format("You selected port '{0}'", cbCommPorts.SelectedItem));
Connect(cbCommPorts.SelectedItem.ToString());
}
else
{
MessageBox.Show("Please select a port first");
}
}
private void Connect(string portName)
{
var serialPort1 = new SerialPort(portName);
if (!serialPort1.IsOpen)
{
serialPort1.BaudRate = 115200;
serialPort1.Open();
btnTransmit.Enabled = true;
btn2.Enabled = true;
btn3.Enabled = true;
btnOpen.Enabled = false;
btnClose.Enabled = true;
}
}
private void btnTransmit_Click(object sender, EventArgs e)
{
if (serialPort1.IsOpen)
{
string value = "12345";
serialPort1.Write(value);
}
else serialPort1.Close();
}
private void txtReceive_KeyPress(object sender, KeyPressEventArgs e)
{
if (serialPort1.IsOpen) return;
char[] buff = new char[1];
buff[0] = e.KeyChar;
serialPort1.Write(buff, 0, 1);
e.Handled = true;
}
private void DisplayText(object sender, EventArgs e)
{
txtReceive.AppendText(RxString);
}
private void serialPort1_DataReceived
(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
{
RxString = serialPort1.ReadExisting();
this.Invoke(new EventHandler(DisplayText));
}
private void btnOpenFile_Click(object sender, EventArgs e)
{
OpenFileDialog openFileDialog1 = new OpenFileDialog();
openFileDialog1.InitialDirectory = "c:\\";
openFileDialog1.Filter = "txt files (*.txt)|*.txt|All files (*.*)|*.*";
openFileDialog1.FilterIndex = 2;
openFileDialog1.RestoreDirectory = true;
if (openFileDialog1.ShowDialog() == DialogResult.OK)
{
System.IO.StreamReader sr = new
System.IO.StreamReader(openFileDialog1.FileName);
MessageBox.Show(sr.ReadToEnd());
sr.Close();
}
}
private void btnExit_Click(object sender, EventArgs e)
{
Application.Exit();
}
private void btnClose_Click(object sender, EventArgs e)
{
serialPort1.Close();
btnOpen.Enabled = true;
btnClose.Enabled = false;
btnTransmit.Enabled = false;
btn2.Enabled = false;
btn3.Enabled = false;
}
}
}
Can someone help me to point out where my error lies in? Thanks

There are several options possible here, but we need more information to tackle this problem. To start off, make sure you are actually sending data. to do this try a breakpoint on the if statement above where you send the data. And step into the code using F10 and see whether you are actually sending any data.
If you are sending data, your code runs fine and check the receiver application. check baudrates etc...

Get Weight From Weigh Bridge Machine Using Serial Port in C#

i am develop application for getting weight from weigh Bridge machine using C#.Net.i am trying lot of ways but,doesn't read correct data format weight from weigh bridge machine.i am getting ouput like ?x???????x?x?x??x???x??x???x???x? continuously get from serial port.i want to get weight from weigh bridge machine my code is listed below:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO.Ports;
using System.IO;
namespace SerialPortTest
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
String a = "";
private void button1_Click(object sender, EventArgs e)
{
serialPort1 = new SerialPort("COM1", 9600, Parity.None, 8, StopBits.One);
serialPort1.DataReceived += new SerialDataReceivedEventHandler(serialPort1_DataReceived);
if (serialPort1.IsOpen == false)
{
serialPort1.Open();
}
timer1.Start();
button1.Enabled = false;
button2.Enabled = true;
}
private void serialPort1_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
a = a + serialPort1.ReadExisting();
}
private void timer1_Tick(object sender, EventArgs e)
{
if (a.Length != 0)
{
textBox1.AppendText(a);
a = "";
}
}
private void button2_Click(object sender, EventArgs e)
{
if (serialPort1.IsOpen == true)
{
serialPort1.Close();
button2.Enabled = false;
button1.Enabled = true;
}
}
private void Form1_Load(object sender, EventArgs e)
{
if (serialPort1.IsOpen == true)
{
button1.Enabled = false;
button2.Enabled = true;
}
else
{
button1.Enabled = true;
button2.Enabled = false;
}
}
}
}
my code is append text from serial port data to textbox but,it's shows only like ?xxx?xxxx?xxxx?
can any one help me how to get weight from serial port using c#
Thanks For Reading My Post!

You are using ReadExisting(), that method tries to convert the bytes received by the port into a string. You'll get a question mark if that conversion fails. The default Encoding is ASCII, a byte value between 128 and 255 is not an ASCII character and thus produces a ?
Several possible reasons, roughly in order of likelihood:
Using the wrong baud rate, in particular guessing too high.
The device might be sending binary data, not strings. Which requires using Read() instead of ReadExisting and decoding the binary data.
Electrical noise picked up by a long cable that isn't shielded well enough. Easy to eliminate as a possible reason by disconnecting the cable at the bridge end. If that stops the data then it isn't likely to be noise.
Be sure to thoroughly read the manual. Contact the vendor of the device if you don't have one or can't make sense of it.

This code will be reading weightbridge continuously in background. Be sure to connect the pc with serial port. Also in design page Form1.cs[Design] you need to add Serial port from the toolbox. This code works for me, I hope it works for you too...
public partial class Form1 : Form
{
//Initialize the port and background Worker
private SerialPort port;
private BackgroundWorker backgroundWorker_Indicator;
public Form1()
{
backgroundWorker_Indicator = new BackgroundWorker();
backgroundWorker_Indicator.WorkerSupportsCancellation = true;
backgroundWorker_Indicator.DoWork += new DoWorkEventHandler(Indicator_DoWork);
//set the port according to your requirement.
port = new SerialPort("COMM2", 2400, Parity.None, 8, StopBits.One);
port.DataReceived += new SerialDataReceivedEventHandler(this.Indicator_DataReceived);
}
//button which starts the method. You can also put the method in Form1_Load()
private void SerialPortButton(object sender, EventArgs e)
{
StartStopIndicator();
}
private void StartStopIndicator()
{
try
{
port.Open();
backgroundWorker_Indicator.RunWorkerAsync();
}catch (Exception ea)
{
MessageBox.Show("13 "+ea.Message);
}
}
// Not a button. Just a methood.
private void Indicator_DoWork(object sender, DoWorkEventArgs e)
{
}
private void Indicator_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
try
{
string str = StripNonNumeric(port.ReadLine());
UpdateWeightOnUI(str);
}
catch (Exception eb)
{
MessageBox.Show("12"+eb.Message);
}
}
private void UpdateWeightOnUI(string Weight)
{
try
{
// A label named weightLabel from the toolbox. This will keep updating on weight change automatically
if (weightLabel.InvokeRequired)
{
this.Invoke((Delegate)new Form1.SetTextCallBack(this.UpdateWeightOnUI), (object)Weight);
}
else
{
weightLabel.Text = Weight;
}
}
catch (Exception ec)
{
MessageBox.Show("11"+ec.Message);
}
}
// This method will remove all other things except the integers
private string StripNonNumeric(string original)
{
StringBuilder stringBuilder = new StringBuilder();
foreach (char c in original)
{
if (char.IsDigit(c))
stringBuilder.Append(c);
}
return stringBuilder.ToString();
}
private delegate void SetTextCallBack(string text);

C# serialport communication for Arduino

I made a little application for my Arduino in C#. Everything works fine, but the problem is in my application. The user can chose his/hers COM port in a numericUpDown.
It works, but if the user chose the wrong port and tries to connect, it crashes, so I was thinking I need an IF statmant that gives a message. For example, the wrong port, etc., but I don't know how to make it. How can I do it?
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.IO.Ports;
namespace IO_Arduino_experiment_project
{
public partial class Form1 : Form
{
public static System.IO.Ports.SerialPort serialPort1;
private delegate void LineReceivedEvent(string line);
public Form1()
{
InitializeComponent();
button5.Enabled = false;
button2.Enabled = false;
button3.Enabled = false;
}
private void button1_Click(object sender, EventArgs e) // Connect Button
{
System.ComponentModel.IContainer components = new System.ComponentModel.Container();
serialPort1 = new System.IO.Ports.SerialPort(components); // Creating the new object.
serialPort1.PortName = "COM" + numericUpDown1.Value.ToString(); // Setting what port number.
serialPort1.BaudRate = 9600;
serialPort1.DtrEnable = true;
serialPort1.Open(); // Open the port for use.
button1.Text = "Connected.";
button1.Enabled = false;
numericUpDown1.Enabled = false;
button5.Enabled = true;
button2.Enabled = true;
button3.Enabled = true;
}
private void numericUpDown1_ValueChanged(object sender, EventArgs e)
{
}
private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
if (serialPort1.IsOpen) serialPort1.Close();
}
private void button2_Click(object sender, EventArgs e)
{
serialPort1.Write("1");
textBox1.Text = "LED is on!";
button2.Enabled = false;
button3.Enabled = true;
}
private void button3_Click(object sender, EventArgs e)
{
serialPort1.Write("0");
textBox1.Text = "LED is off!";
button2.Enabled = true;
button3.Enabled = false;
}
private void button4_Click(object sender, EventArgs e)
{
Close();
}
private void button5_Click(object sender, EventArgs e)
{
serialPort1.Close();
button1.Enabled = true;
numericUpDown1.Enabled = true;
}
}
}

You should really replace the numeric up/down with a ComboBox or some other list control/menu that populates when the form opens or when a refresh button is clicked (or by other automatic means such as a timer).
The ComboBox or List can be filled using the GetPortNames method:-
String[] pNames;
pNames = System.IO.Ports.SerialPort.GetPortNames();
If you want to do what you have described then you can lookup the port to see if it exists prior to attempted use using similar code:-
if (System.IO.Ports.SerialPort.GetPortNames().indexOf("COM" + thePortNum.ToString())>-1)
Note thatGetPortNames() returns a list like this:-
COM1
COM10
COM12