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中国DOS联盟论坛 » DOS开发编程 & 发展交流（开发室） » DJGPP教程1 -- 介绍

Wengier
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『楼主』: DJGPP教程1 -- 介绍

For the first step I will discuss about programming VGA cards at a resolution of 320x200 with 256 colors. This is the magic BIOS mode 13h, simple to use and very efficiently. Next I'll explain how to use the BMP and PCX graphics format at this resolution, whit the basics about sprites and frames.
What  languages  should  I  use?
Until writing programs under DOS or Linux the best choice about languages is the famous C/C++. I prefer it because is very powerful, fast and very simple to interface with assembly procedures. If I write programs under Windows I prefer Delphi because is very simple to use, but I hardly make programs under Windows. Only under DOS or Linux I can take the whole control of the keyboard, the timer, the graphics card with my own code. Instead under Windows I must use the code written by other (because this OS is very hardly to use) and I never can take the whole control of the machine. In my opinion the windows system is useful only for serious application, not for games. Pheraphs I know only a bit about this system, so I can say bad.

How  about  compilators?
For years I've used Turbo C and next Borland C/C++. Those compilators was very good for the DOS machine: very fast in compiling and linking and easy to use. But the programs compiled with those compilers are limited by the 16 bit code. But since I've discovered Internet I've used the great DJGPP 32 bit compiler: fast, powerful and FREE! I think is the best choice if you haven't enough money to buy Watchom C/C++, another 32 bit compiler. Read the next paragraph for more information.

What  is  DJGPP?
DJGPP is a 32 bit compiler for the i386 (or better) processor based upon DOS system. It use an DPMI server which allows a 4 GByte flat address space and up to 256 MBytes of virtual memory. It's very similar to the GNU project for Linux. For details see the readme.1st downloaded from one of the following ftp servers.

You can download the files from a lot of ftp site. There are a list:

Country       Host                   Directory
---------    ---------------------- -------------------
Australia    ftp.iniaccess.net.au    /pub/simtelnet
Australia    ftp.tas.gov.au          /pub/simtelnet
Belgium       ftp.linkline.be       /mirror/simtelnet
Belgium       ftp.tornado.be          /pub/simtelnet
Brazil       ftp.unicamp.br          /pub/simtelnet
Canada       ftp.direct.ca          /pub/simtelnet
Canada       ftp.synapse.net       /pub/simtelnet
Czech Republic  pub.vse.cz             /pub/simtelnet
China          ftp.pku.edu.cn          /pub/simtelnet
England       micros.hensa.ac.uk    /pub/simtelnet
England       ftp.demon.co.uk       /pub/simtelnet
England       sunsite.doc.ic.ac.uk    /packages/simtelnet
Finland       ftp.funet.fi          /mirrors/ftp.simtel.net/pub/simtelnet
France       ftp.grolier.fr          /pub/simtelnet
France       ftp.ibp.fr             /pub/simtelnet
Germany       ftp.tu-chemnitz.de    /pub/simtelnet
Germany       ftp.uni-heidelberg.de /pub/simtelnet
Germany       ftp.uni-paderborn.de    /pub/simtelnet
Germany       ftp.uni-trier.de       /pub/pc/mirrors/simtelnet
Hong Kong    ftp.hkstar.com          /pub/simtelnet
Hong Kong    sunsite.ust.hk          /pub/simtelnet
Italy          cis.utovrm.it          /simtelnet
Italy          ftp.unina.it          /pub/simtelnet
Japan          ftp.iij.ad.jp          /pub/simtelnet
Japan          ftp.riken.go.jp       /pub/simtelnet
Japan          ftp.saitama-u.ac.jp    /pub/simtelnet
Korea          ftp.nuri.net          /pub/simtelnet
Mexico       ftp.gdl.iteso.mx       /pub/simtelnet
Netherlands    ftp.nic.surfnet.nl    /mirror-archive/software/simtelnet
New Zealand    ftp.vuw.ac.nz          /pub/simtelnet
Poland       ftp.icm.edu.pl          /pub/simtelnet
Portugal       ftp.ip.pt             /pub/simtelnet
Portugal       ftp.ua.pt             /pub/simtelnet
Romania       ftp.sorostm.ro          /pub/simtelnet
Slovenia       ftp.arnes.si          /software/simtelnet
South Africa ftp.is.co.za          /pub/simtelnet
South Africa ftp.sun.ac.za          /pub/simtelnet
South Korea    ftp.nuri.net          /pub/simtelnet
South Korea    ftp.sogang.ac.kr       /pub/simtelnet
Sweden       ftp.sunet.se          /pub/simtelnet
Switzerland    nic.switch.ch          /mirror/simtelnet
Taiwan       ftp.ncu.edu.tw          /Packages/simtelnet
Taiwan       NCTUCCCA.edu.tw       /PC/simtelnet
Thailand       ftp.nectec.or.th       /pub/mirrors/simtelnet
US, California  ftp.digital.com       /pub/micro/pc/simtelnet
US, Illinois uiarchive.cso.uiuc.edu /pub/systems/pc/simtelnet
US, Mass.    ftp.bu.edu             /pub/mirrors/simtelnet
US, Michigan oak.oakland.edu       /pub/simtelnet
US, Oklahoma ftp.uoknor.edu          /pub/simtelnet
US, Oregon    ftp.orst.edu          /pub/simtelnet
US, Virginia mirrors.aol.com       /pub/simtelnet

There are a list of file to dowload (link are referred to ftp.digital.com):
To build C programs, you'll need
djdev201.zip (1502Kb) - Basically libraryes and application
gcc2721b.zip (1071Kb) - The compiler binary
bnu281b.zip (1740Kb)- various utility
For C++
gpp2721b.zip (665Kb) - The C++ compiler binaries
lgp271b.zip (623Kb)
Other stuff:
txi390b.zip (455Kb) for the online manual (info)
csdpmi3b.zip (39Kb) if you don't have a DPMI server
faq210b.zip (389Kb) - The full FAQ list
alleg22.zip - A graphics library
rhide13b.zip (1451Kb) - An integrated IDE like Borland C for DJGPP (very useful)
mak375b.zip (204Kb) - Make utility
infng100.zip - Trasform info file to norton guide database
For more informations visit the official site.

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