Mail Archives: djgpp/1996/04/07/01:24:29
On Thu, 4 Apr 1996 cchoi AT ids2 DOT idsonline DOT com wrote:
> I'm just new at djgpp so undoubtly I have many questions about it but
> unable to find the answers in either the faq nor other sources such as
> avly AT remus DOT rutgers DOT edu's tutors.
Be sure you've read the latest version of the DJGPP FAQ list. You can get
it by downloading the file v2/faq200b.zip from the same place you got the
rest of DJGPP.
> The main question I have right now is about the memory organization of
> djgpp. I am wondering if I can use memcpy, memset and other memory
> related procedures in string.h or mem.h as if I would have used in
> Borland C++/Turbo C++.
It's much better than that: you can use all those functions without
bothering about such 16-bit plagues as crossing 64K boundaries etc.
However, if you move data between your program and memory-mapped devices
(like the video memory), please be sure to read section 18.4 in the FAQ
list.
> Also if I declare a large array: char buffer[64000] then can I access
> it as I were in real mode such as buffer[0]=0.
Of course. Just be aware that if you declare large automatic arrays, the
default amount of stack in DJGPP is 256KB. If you get anywhere near that
figure, you should enlarge the stack size. The FAQ list explains how in
section 15.8.
> I have compiled some
> graphics program I programmed under Turbo C++ and they did compile but
> when I linked and ran the program, the program spit out "page fault."
If that program was written under TC, be sure you convert correctly all
the places where you access the video RAM and call various interrupts.
The FAQ explains this in chapters 17 and 18; please read them. If that
doesn't help, post a code fragment that crashes and somebody will have an
answer for you.
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