Question

I am sending and receiving data using COM port (serial). I have written the following code. This is actually my first C# project as I am kinda new to it. I am trying to write the received data to the text file on my desktop, the program actually creates the file but writes nothing in it. Similarly, I am able to see the received data on the console but it is not being written to the text file. Any help on what I am doing wrong will be much appreciated.

Thank you. The code is below.

class Program
{
    SerialPort p = new SerialPort("COM7", 300, Parity.None, 8, StopBits.One);
    string sbuffer = string.Empty;
    byte i = 0;
    static void Main(string[] args)
    {
        new Program();
    }

    Program()
    {
        string[] names = SerialPort.GetPortNames();
        Console.WriteLine("Serial ports:");
        foreach (string name in names)
        {
            Console.WriteLine(name);
        }
        Console.WriteLine("Using COM7");

        p.Open();


        string data_ = "$1RB\r";
        Console.WriteLine("Writing data: {0}",data_);
        p.Write(data_);
        p.DataReceived += new SerialDataReceivedEventHandler(p_DataReceived);
        Console.ReadKey();
        p.Close();
    }


    void p_DataReceived(object sender, SerialDataReceivedEventArgs e)
    {
        Thread.Sleep(5);
        sbuffer += (sender as SerialPort).ReadExisting();
        i++;
        if (i > 9)
        {
            Console.WriteLine(sbuffer);
          System.IO.File.WriteAllText(@"C:\Users\myname\Desktop\WriteText.txt", sbuffer);
            sbuffer = string.Empty;
        }
    }
}

}

Answer 1

You could use events, or simply use this method and pass your data string to it. It will simply append to the file as long as it exists, or create a new file if it does not. The data written should be identical to whatever output is appearing in your console screen.

    static void WriteOutputToTextFile(string _data)
    {
        string FolderName = Environment.GetFolderPath(Environment.SpecialFolder.Desktop);   //set destination as your desktop
        using (StreamWriter SW = new StreamWriter(FolderName + "\\test.txt", true))   //true makes it append to the file instead of overwrite
        {
            SW.WriteLine(_data);
            SW.Close();
        }
    }