• C

Unbuffered input, input form on VMS.

Hello, I hope someone can help:

I would like to use an "instant response" menu for a VMS C program that I am writing. I am working on Open VMS AXP 6.1 with Dec C 4.0. The getch() type functions are not available. setvbuf with the unbuffered option does not work either. Every input function (even file I/O directed at stdin) waits for the user to press enter before the program continues. I want it to allow the user to press only one key. I even tried closing stdin and reopening it using "SYS$INPUT" as the file, then using setvbuf, but that did not work either. Unbuffered input works with Cobol programs on this system so I think it should be possible with C.
 
Also, I would really like to design a nice input form with multiple fields that would allow the user to use the arrow or tab keys to move between fields. Does anyone know of any nice headers or libraries to allow me to do this?

Any suggestions will be greatly appreciated - even if it is to tell me that it cannot be done. (or at least is not worth it for a small program) Thank you very much.

P.S.
I am a student, and I need this information for a college project that I am working on. None of the CIS Professors currently know how to do this, however, they all would like to know. So, if you know the answer, it will get a LOT of use by many future students I am sure. Thanks again.

                                     Dave                        
dave_cAsked:
Who is Participating?
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.

obgCommented:
I'm sorry if this is a poor answer, but you will have to use a "qiow" call. I have forgot the parameters, as the have removed the only VMS system I had access to long ago... If I where you, I'd check with my system administrator.
0
julio011597Commented:
I'm afraid it is not worth a small program.

This said, you need the curses library to do what you want.
Have a look at curses(3) man page:

"The Curses package allows: overall screen, window, and pad manipulation; output to windows and pads; reading terminal input; control over terminal and Curses input and output options; environment query routines; color manipulation; use of soft label keys; terminfo database access; and access to low-level Curses routines."

BTW, you have no chance to read a single character with stdio library.

HTH, julio
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
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
C

From novice to tech pro — start learning today.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.