[DUG] LPT ports

[Ross Levis]

Thanks Paul, however, the first link is also only for DOS based systems up
to Windows ME.

 

The Sergey Ageev component "DirectPort" is similar to what I am using
already -- another component on that page called SmallPort.  Both components
allow accessing ports directly as you can in MS-DOS and up to Windows ME.
I've been using SmallPort for a few years and it works fine up to Windows
Vista.

 

However, neither component provides a way to find the I/O address of a
specific port.  I'm currently using a unit which uses several
HKEY_LOCAL_MACHINE registry locations to obtain the I/O address of an LPT
port, but this is not working in the case of a USB based removable LPT port.

 

All I need is the I/O address allocated to this LPT port.  I don't need a
component to access the port itself.  It can be set as LPT1, LPT2, LPT3 etc
in the configuration, but then how does a program see what LPT ports are
available?  There must be some way.

 

Any further ideas?

 

Thanks,

Ross.

 

From: delphi-bounces at delphi.org.nz [mailto:delphi-bounces at delphi.org.nz] On
Behalf Of Paul A Norman
Sent: Wednesday, 19 December 2007 12:18 a.m.
To: NZ Borland Developers Group - Delphi List
Subject: Re: [DUG] LPT ports

 

Dear Ross,

 

Never used these, found them years ago(!), might be worth checking through
and see if they give any routine for doing that. I am thinkinhg that one of
the things below may have an iteration process for looking.

 

Never done it myself though!

 

Paul

 

TRY://

 

http://www.torry.net/authorsmore.php?id=1332

 

This guy has had stuff on the net in the past Lars at dybdahl.dk

 

And look for Seergev Ageev on http://www.torry.net/pages.php?id=227


 

On 17/12/2007, Ross Levis <ross at stationplaylist.com> wrote: 

Does anyone know of a way to find all LPT ports installed on a PC and the
I/O address of the ports.

 

Up to now I've been using a 3rd party routine I found on the internet which
uses the registry to obtain this information, and this has worked well for
years, but a user has installed a USB based LPT port and it doesn't appear
in the usual place in the registry, although Windows sees it as LPT1. 

 

I need the physical I/O address of the port as I need this to access the
individual pins on the port, using a 3rd party device driver service which
allows low level access to ports.

 

Thanks,

Ross.

 

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