get com port number of an USB adapter

Question

I am trying to write a program that uses an arduino mega and a FTDI-based USB to RS485 adapter.

I want to make the program user-friendly, thus I don\'t wont the user

Answer 1

This might work for you. I used this to dynamically read port number of Arduino on a system. Here

description.Contains("uino")

is to look for both Arduino and Genuino keyword for both varients of board.

    public string detectArduinoPort()
    {
        ManagementScope mScope = new ManagementScope();
        SelectQuery query = new SelectQuery("SELECT * FROM Win32_SerialPort");
        ManagementObjectSearcher objectList = new ManagementObjectSearcher(mScope, query);

        try
        {
            foreach (ManagementObject obj in objectList.Get())
            {
                string description = obj["Description"].ToString();
                string deviceId = obj["DeviceID"].ToString();

                if (description.Contains("uino"))
                {
                    return deviceId;
                }
            }
        }
        catch (Exception)
        {

        }
        return "";
    }