Want to win a PS4? Go Premium and enter to win our High-Tech Treats giveaway. Enter to Win

x
?
Solved

far pointer to vga memory

Posted on 2000-04-15
4
Medium Priority
?
284 Views
Last Modified: 2006-11-17
i used to have a borland compiler and a far pointer to vga memory worked just fine to put stuff on the screen, but now I have DJGPP, and it wont let me make a far pointer! What can I do?
0
Comment
Question by:napalm20001
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
4 Comments
 
LVL 22

Expert Comment

by:nietod
ID: 2719504
Is this a 32 bit compiler.  (one for win32).  If so win32 uses a flat model so there are no near and far pointers.  Also it uses virtual memory so an application cannot diretcly access the video memory.   However win32 has many alternatives, so you don't have to.

I goess the first thing to do is to determine if this is a 16  or 32 bit complier.  check the docs and let us know.
0
 

Author Comment

by:napalm20001
ID: 2719826
its 32 bit
0
 
LVL 22

Expert Comment

by:nietod
ID: 2720266
You have two choices.  Don't use the compiler and stay in the 16 bit world.  Or switch to 32 bits and all the changes that may entail.

If you switch to 32 bits you will have far far more memory available to you.  you will also have available to you the entire windows API.  This includes features for creating windows, menus, consoles, allocating virtual memory, COM, etc.    but you will not be able to directly access hardware.  You cannot, for example, write directly to the video memory.  There are almost always alternate ways to reach the same ends though.

Obviously I can't tell you much more than that.  I don't know anythoung about yoru program so I can't say how hard it woudl be to convert to win32 or what would need to be changed.
0
 
LVL 32

Accepted Solution

by:
jhance earned 400 total points
ID: 2720847
DJGPP has built in access to the VGA display memory.  It sometimes (though not always) helps to read the documentation.

See:

http://www.delorie.com/djgpp/v2faq/faq10_2.html
0

Featured Post

Important Lessons on Recovering from Petya

In their most recent webinar, Skyport Systems explores ways to isolate and protect critical databases to keep the core of your company safe from harm.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Written by John Humphreys C++ Threading and the POSIX Library This article will cover the basic information that you need to know in order to make use of the POSIX threading library available for C and C++ on UNIX and most Linux systems.   [s…
Article by: evilrix
Looking for a way to avoid searching through large data sets for data that doesn't exist? A Bloom Filter might be what you need. This data structure is a probabilistic filter that allows you to avoid unnecessary searches when you know the data defin…
The goal of the tutorial is to teach the user how to use functions in C++. The video will cover how to define functions, how to call functions and how to create functions prototypes. Microsoft Visual C++ 2010 Express will be used as a text editor an…
The viewer will learn how to clear a vector as well as how to detect empty vectors in C++.
Suggested Courses

604 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question