Bizarre error message from SerialPort.open

Rof · Joined: 07 Feb 2008 Posts: 3

I have an app that talks to COM8 (the "Outgoing" Bluetooth port on a
PDA. Periodically, when it has previously been in use, it seems, I get
the error

"The port 'COM8:' does not exist."

on sport.open().

Apart from the fact that COM8 clearly does exist, where does "COM8:"
come from? I definitely defined it as "sport.PortName = "COM8"" - so
(a) why does it think it doesn't exist, and (b) where does that colon
in the port name come from?

Peter Royle

Archived from group: microsoft>public>pocketpc>developer

Dick Grier · Joined: 15 Aug 2007 Posts: 171

Hi,

When the CreateFile API call is issued, the colon is added (the API uses
it).

I suspect that the BT driver is at fault. BT implementation seem to be a
"work in progress." I doubt that there is a sofware remedy.

Dick

--
Richard Grier, MVP
Hard & Software
Author of Visual Basic Programmer's Guide to Serial Communications, Fourth
Edition,
ISBN 1-890422-28-2 (391 pages, includes CD-ROM). July 2004, Revised March
2006.
See www.hardandsoftware.net for details and contact information.

Henryk Birecki · Joined: 15 Aug 2007 Posts: 60

Rof wrote:

>Apart from the fact that COM8 clearly does exist, where does "COM8:"
>come from? I definitely defined it as "sport.PortName = "COM8"" - so

This may well be your problem. I am using C, C++ only, but in my
programs I do have to add a colon to the name for WinCE devices. Try
sport.PortName = "COM8:"

Cheers,
Henryk Birecki

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