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Re: Port Scans - unsolved

#8278

From: Bob Gonder
Date: Tue, 09 Nov 2004 17:23

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Pete Fraser wrote:

>You don't need the second createfile and in fact it won't work as it's 
>already open
>You just change the baud rate.
>(It's the same as opening a file that's already open - it can't be done!)

It can if you open with file sharing enabled.
(But sharing com ports isn't a good idea)

>Note that closePort leaves the handle returned from CreateFile still open.

IOW, use CloseHandle() after ClosePort
For every successful CreateFile, issue a CloseHandle.

Either  1)
> CreateFile
>   Set baud rate to 9600
>   openPort
      test
>     close port
>     set baud rate to 19200
       openPort
       test
>       close port
CloseHandle

Or 2)
> CreateFile
>   Set baud rate to 9600
>   openPort
      test
>     close port
CloseHandle
> CreateFile
>     set baud rate to 19200
       openPort
        test
>       close port
CloseHandle

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From: Bob Gonder <notbg@notmindspring.invalid>
Newsgroups: borland.public.cppbuilder.nativeapi
Subject: Re: Port Scans - unsolved
Date: Tue, 09 Nov 2004 09:23:37 -0800
Organization: MindSpring Enterprises, Inc.
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