From:	Sinan_Unur AT mail DOT com (A. Sinan Unur)
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: memset etc.
Date:	11 Aug 2000 15:41:14 GMT
Organization:	Cornell University
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mpolve AT tin DOT it (ClaudioF) wrote in <8mu28b$202$1 AT nslave1 DOT tin DOT it>:

You might benefit from taking a look at simpld at 
http://www.unur.com/howto/c-examples.html. It demonstrates how to get into VGA 
mode 0x13, and use far pointers under djgpp to write your putpixel.

After you feel comfortable with that, however, I suggest you download Allegro.
...

>void PutPixel (int x, int y, char color)
> {
>  unsigned char *ScreenPointer;
>
>  ScreenPointer = (unsigned char *) 0x0a0000;
>  memset (ScreenPointer+(x + (y*320)), color, 1);              // 
>  Here's 
>the problem. I can't resolve it
> }

...

that is because, in protected mode, the screen resides in a different address 
space than the data segment of you program.

besides, it seems rather wasteful to use a block copy function to set a single 
address locations.

Sinan.
-- 
--------------------------------
A. Sinan Unur
http://www.unur.com/

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