From: Leon AT caresystems DOT com DOT au
To: djgpp AT delorie DOT com
Date: Tue, 18 Jul 2000 14:52:55 +1000
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Subject: Re: Programming IO Ports in djgpp
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On 17 Jul 2000, at 20:11, Paulo J. Matos aka PDestroy wrote:

> Hi,
> I use djgpp to compile my C programs under windows
> since I'm used to gcc. I need help on programming
> I/O Ports under Windows 

under windows?
well my very limited understanding is as such
if you wanna write to port (eg lpt1)
just use call to ::CreateFile - the name of this 
call might be not very easy to predict but in 
description it does actually say that this call 
can be used not only to create files - but 
handles to communications ports, pipes etc.

anyway in one of the params you can simply 
type "LPT1" or whatever the name of port is.

in order to actually send data to that port use 
::WriteFile call.

Some things to be understood - it works fine for 
SENDING data to ports, the READING data 
from some device conncected to a given port 
could be more complicated (probably you are 
getting into the driver realm here).

Also if you want to send data to say LPT1 port 
BUT on a different machine (say from win95 
workstation to winNt server) - it could be 
simpler to consider using other methodologies.