Re: Opening COM port twice

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#12599

From: Michael Powell
Date: Sat, 29 Nov 2003 17:28

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Can you be more specific?

Is the first application your own? Or third-party / off-the-shelf?

Sounds like maybe that application is opening with exclusive read/write
access, not shared.

Regards,
Michael

"Denville Longhurst" <Denville@metco.co.uk> wrote in message
news:3fc8c2ee@newsgroups.borland.com...
> Hi
>
> Is it possible for two applications to open a COM port simultaneously?  I
> have to share data coming in on a port with another application (both make
> different use of the data).  I have tried CreateFile using FILE_SHARE_READ
> (in both apps), and using both overlapped and non-overlapped operation,
but
> in all cases the second application gets File Access Denied.
>
> If it is not possible conventionally, how do I write something like a port
> monitor to achieve the same result ??
>
> Many thanks for any help,
>
> Denville.
>
>

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