Subj : Serial port query
To : Darin McBride
From : Vitus Jensen
Date : Sun Aug 06 2000 05:55 pm
Moin Darin!
04.08.2000, Darin McBride wrote a message to all:
DM> I've been asked how to do something I'm at a loss as to where to start
DM> - if it's possible at all. To quote the person asking me:
DM> Is there a way 1. to check the state of a port, 2. determine the
DM> application using it?
DM> By #1, I believe he means "determine if a comm port was in use".
DM> Any ideas whatsoever would be appreciated. I believe #1 can be done
DM> by an attempt to open the port as a file in "DENY_ALL" mode - if it
DM> fails, someone is using it. I don't believe #2 is possible. If I
DM> could be corrected, that would be great. :-)
Get OS2UNDOC from hobbes and have a look at the DosQuerySysState API. It will
return infos about all open files of a single or all processes. There are
problems when using it at certain fixpak levels (older Warp 3 fixpaks).
And Scott Garfinkle posted in C.O.O.P.Misc that it is now possible getting
infos about all open semaphore handles as well. Starting with FP 13 AFAIR (got
the msg stored somewhere).
