Visual C++ & Parallel Port

How can the parallel port be written or read(every single pin) using Visual C++(version 4.2 or 5.0)?
hccaoAsked:
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

x
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

os012897Commented:
Hi hccao,

There are functions to do this, though I do not remember the exact name of them. Search in help for "Comm" or "port" ....

Accessing *every* single pin could be a problem. You can access the 8 different data-pins easily using bit-masks. The other pins are status indicators (e.g. on/offline of a printer). You can access those pins using status-read or write functions. I am not sure whether all pins can be accessed that way though.

Greetings,

            os

0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
messiahCommented:
Come on man, if you're gonna answer the question, answer the question. Beating around the bush helps no one.
0
os012897Commented:
I do not think this was beating on the bush ....

This is the principal way how to do it. Nevertheless it is true that the answer is generic, although the question specifically conentrated on a solution for VC++. I do not have the documentation for VC++ available at the moment, which was the reason for the generic way of my answer.

I would recommend hccao to therefore reject my answer in case it did not help. If anybody (messiah?) has the exact solution to the problem, post it.

If noone could answer it till monday, I will look some more info up at work and post it is a comment.

Greetings,
   
                 os

0
Acronis True Image 2019 just released!

Create a reliable backup. Make sure you always have dependable copies of your data so you can restore your entire system or individual files.

messiahCommented:
The reason why I intervened was not because I could come up with a better answer, but that I could benefit from the answer as I am having the exact same problem.

BTW: I did not mean to offend you or anyone else, just merely stating that the answer wasn't really an answer :)

-messiah
0
os012897Commented:
No offense taken :)

os

0
os012897Commented:
I took a look at my documentation at work and have to say that I wont be able to come up with a proper solution.

As under DOS you can use the int17h to send and retrieve data and status of a printer, (which gave u about 16 pins to read and write) I assumed wrongly that there is a straight forward way to this in Windows too.

The farthest I got were the SetPrinter and GetPrinter functions that let you set and retrieve the status of the printer.Though those will give u access to at most 8 pins of the port in case it somehow corresponds to the behaviour of the DOS-printer status.

With the WritePrinter and ReadPrinter you should be able write and read another 8-bits of the port.

So you could probably get 16 pins working for you, though it is a pretty humble way, in case it works at all.

Hmmm ... a better way would probably be to search for a library that accesses the parallel port bitwise via the printer-device-driver.

I'd put the question back for evaluation, as there might be someone who solved it properly.

Greetings,

        os

0
messiahCommented:
Wow, thanks os.. you got me thinking :)
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Software

From novice to tech pro — start learning today.