Subj : Re: COM  Ring Indicator
To   : borland.public.cpp.borlandcpp
From : Matt Claessen
Date : Sun Jul 17 2005 01:03 pm

Hi,

"Jack Sawatzky" <j-s@telusplanet.net> wrote in message 
news:42d813f6@newsgroups.borland.com...

> I looked at  SetCommState(), but was unable to see anything that
> related to the ring indicator.
> Can you tell me how to access this signal?
>
> Thanks.
>

Maybe you ran into a nasty difference between windows versions.

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnfiles/html/msdn_serial.asp

says:
Note   The Microsoft Win32 SDK Knowledge Base documents a problem with
Windows 95 and the EV_RING flag. The above code never returns in Windows 95
because the EV_RING event is not detected by the system; Windows NT properly
reports the EV_RING event. Please see the Win32 SDK Knowledge Base for more
information on this bug.

I have found out that there many such subtle differences. Best to use a 
third party library
for comm support and let them handle these problems.

regards, Matt

.