🚀 go-pugleaf

Both applications are mine, but to test the concept I wrote a very simple
terminal which monitored the port, opening with
CreateFile( "COM1", GENERIC_READ, FILE_SHARE_READ, 0, OPEN_EXISTING, ... )
I have tried both simple and overlapped.  I ran the same application twice
(ie simultaneously) but the second instance always gave an access denied
error.

Thanks for the interest...

Denville
Leeds, England.


"Michael Powell" <powellmw@comcast.net> wrote in message
news:3fc8d676@newsgroups.borland.com...
>
> 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.
> >
> >
>
>