Unhandled exception when disconnecting hub with serial converter

[danielschenk]

I have a setup with a USB hub, to which multiple serial devices are attached. I listed them below. I usually have 3 instances open, which I marked with an arrow.

COM3    ----    ----    Standard Serial over Bluetooth link (COM3) [SPPS De]
COM4    ----    ----    Standard Serial over Bluetooth link (COM4) [Bluetooth Peripheral Device]
COM6    1366    0105    USB Serial Device (COM6) [CDC]   <--
COM11   1366    0105    USB Serial Device (COM11) [CDC]  <--
COM24   0403    6011    USB Serial Port (COM24)
COM25   0403    6011    USB Serial Port (COM25)
COM26   0403    6011    USB Serial Port (COM26)          <--
COM27   0403    6011    USB Serial Port (COM27)

The last four COM ports all belong to the same FTDI4232 Mini Module.

Whenever I reconnect any of the separate devices, recovery is all fine. However, when I disconnect the complete USB hub (causing the removal of all of above COM ports, except the Bluetooth ones), the SimplySerial instance using COM26 throws this exception:

Unhandled Exception: System.Management.ManagementException: Not found
   at System.Management.ManagementException.ThrowWithExtendedInfo(ManagementStatus errorCode)
   at System.Management.ManagementObject.InvokeMethod(String methodName, ManagementBaseObject inParameters, InvokeMethodOptions options)
   at System.Management.ManagementObject.InvokeMethod(String methodName, Object[] args)
   at SimplySerial.ComPortManager.GetPorts()
   at SimplySerial.SimplySerial.Main(String[] args)

[process exited with code 3762504530 (0xe0434352)]

When I restart the instance it is fine again.

SimplySerial version 0.9.0 Installation Type : System Installation Path : C:\Program Files (x86)\SimplySerial
Board Data File : 2025-03-04T20-57-17.992214

[markeby]

When detecting disconnected, SimplySerial should then only poll the COM port after verifying that it exists first. There could even be and option to set the detection interval when disconnected. I have about 3 out of 10 times getting an unhandled fault when disconnecting EPS32 modules as well. I often turn off a module for a quick change and then back on.