Lost Comport Error

[wthorson]

I have an application that connects to a device through the USB port with a USB to Serial Converter.  So the Port is treated as a comport say COM 1.  Everything works good I can open, close, read and write to the Comport.  But the problem comes in if the port gets disconnected and then I try to read from it.  The application locks up or shuts down.  This happens becuase the USB - Serial converter is viewed as a comport and then disapears when it is unplugged.  Is there anything I can do to verify that the comport is still there prior to doing a read/write or what would be the best method to handle this error?

Thanks

[scomack]

I guess at the very least you could always close it and then re-open it.
Check the return value on the re-open to see if it is there.

[wthorson]

I have actually added functionality to verify that it is still there right before I read to the data, but it still happens that it errors out during the read.  I would have expect labWindows to handle it gracefully and just report the error, but it doesn't seem to be doing that.

Thanks

[Sputnikrent]

Does it say that the com port is available even if you have the USB-Serial converter disconnected?