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Question by kavanagh4 · Oct 06, 2019 at 08:13 AM · unity 5serialport

Serial port IOException: access is denied

Have the following code:

It's ok the first time I call this method but the second time I get the error IOException: Access is denied.

I haven't found any online help with this specific problem. Thanks for any help you can provide.

using System.Collections; using System.Collections.Generic; using UnityEngine; using UnityEngine.UI; using TMPro; using System.IO; using System.IO.Ports;

public class ReadPortData : MonoBehaviour // Comes here when 'connect' is clicked, to start reading serial port data { public TMP_Dropdown portName; public TMP_Dropdown baudRate; public TMP_Dropdown dataBits; public TMP_Dropdown stopBits; public TMP_Dropdown parity;

 private string spName;
 private int baud;
 private int dB;
 private int sB;
 private string pRity;

 public SerialPort sp;

 public void ReadDataFromBHI()
 {
     //   First get the values that were selected on the pnlComms dropdowns

     sp = new SerialPort();

     spName = portName.options[portName.value].text;
     baud = int.Parse(baudRate.options[baudRate.value].text);
     dB = int.Parse(dataBits.options[dataBits.value].text);
     sB = int.Parse(stopBits.options[stopBits.value].text);
     pRity = parity.options[parity.value].text;
     

     sp.PortName = spName;
     sp.BaudRate = baud;
     sp.DataBits = dB;
             
     switch (sB)
     {
         case 0:    sp.StopBits = StopBits.None; break;
         case 1: sp.StopBits = StopBits.One; break;
         case 2: sp.StopBits = StopBits.Two; break;
     }

     switch (pRity)
     {
         case "None": sp.Parity = Parity.None; break;
         case "Odd": sp.Parity = Parity.Odd; break;
         case "Even": sp.Parity = Parity.Even; break;
     }

     // Next open the port and activate the data recieved event handler

     Debug.Log("made it to ReaddatafromBHI");
     Debug.Log(sp.PortName);
     Debug.Log(sp.BaudRate);
     Debug.Log(sp.DataBits);
     Debug.Log(sp.StopBits);
     Debug.Log(sp.Parity);
     Debug.Log(spName + sp.IsOpen);
     
     sp.DataReceived += new SerialDataReceivedEventHandler(DataIn);
     if (sp.IsOpen==false) sp.Open();
 }
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