Article View: borland.public.cppbuilder.nativeapi
Article #5032Re: serial COM ports from various COM objects
From: Alan Bellingham
Date: Tue, 01 Nov 2005 17:30
Date: Tue, 01 Nov 2005 17:30
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1906 bytes
"Remy Lebeau \(TeamB\)" <no.spam@no.spam.com> wrote: >"Vladimir Afanasyev" <avv@systema.kiev.ua> wrote in message > >> Who can tell the way how to access to serial port from >> COM object (ReadFile, WriteFile :nonverlapped) if >> CreateFile for serial port was called from another COM object. > >You cannot. Serial and Parallel ports can only have one handle opened to >them at a time, and that handle has exclusive access. Two objects cannot >open the same port at the same time. The second object will always fail >until the first object closes the port. But if the other COM object passes you the handle, then you should be OK. Since it's in the same thread, I think that should work fine. Alan Bellingham -- Team Thai Kingdom <url:http://www.borland.com/newsgroups/> Borland newsgroup descriptions <url:http://www.borland.com/newsgroups/netiquette.html> netiquette
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X-Google-Thread: 10cc67,a36c2447d040b89c X-Google-Attributes: gid10cc67,public X-Google-Language: ENGLISH,ASCII-7-bit From: Alan Bellingham <alanb@episys.com> Newsgroups: borland.public.cppbuilder.nativeapi Subject: Re: serial COM ports from various COM objects Date: Tue, 01 Nov 2005 17:30:35 +0000 Reply-To: alanb@episys.com Message-ID: <qf9fm19u4gqlt1n66acge6lvq9c5h357n1@4ax.com> References: <43677c8e$1@newsgroups.borland.com> <4367a444$1@newsgroups.borland.com> X-Newsreader: Forte Agent 3.1/32.783 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit NNTP-Posting-Host: 62.49.31.105 X-Trace: newsgroups.borland.com 1130866225 62.49.31.105 (1 Nov 2005 09:30:25 -0700) Lines: 21 Path: arc1-ca.pugleaf.net!g2news1.google.com!news4.google.com!border1.nntp.dca.giganews.com!nntp.giganews.com!nx02.iad01.newshosting.com!newshosting.com!news-out.newsfeeds.com!propagator2-sterling.newsfeeds.com!in.nntp.be!caladan.landsraad.net!newsgroups.borland.com!not-for-mail