Subj : Re: DOS question (revised)
To   : borland.public.cpp.borlandcpp
From : waking@idirect.com (Wayne A. King)
Date : Mon Jul 14 2003 10:04 pm

On Mon, 14 Jul 2003 19:52:29 GMT, waking@idirect.com (Wayne A. King) wrote:

>Hmmm, pseudo-code?

Just so you don't think I'm only an armchair critic,
here's a fleshed-out example of what I expect
you were suggesting. N.B. - Error checking of
fread/fwrite omitted for brevity.

#include <stdio.h>
#include <conio.h>
#include <stdlib.h>

void SaveScreen(FILE *fptr, int left, int top, int right, int bottom);
void ReadScreen(FILE *fptr);

extern _stklen = 8192;

int main()
{
    FILE *ptr = fopen("scrndmp", "wb");
    if(!ptr)
        {
        fprintf(stderr, "Can't open file!\n");
        return EXIT_FAILURE;
        }
    SaveScreen(ptr, 1, 1, 80, 25);
    fclose(ptr);
    getch();
    clrscr();
    getch();

    ptr = fopen("scrndmp", "rb");
    if(!ptr)
        {
        fprintf(stderr, "Can't open file!\n");
        return EXIT_FAILURE;
        }
    ReadScreen(ptr);
    fclose(ptr);
    getch();
    return EXIT_SUCCESS;
}

void SaveScreen(FILE *fptr, int left, int top, int right, int bottom)
{
  int scn_image[132 * 50];
  gettext(left, top, right, bottom, scn_image);

  fwrite(&left, sizeof(int), 1, fptr);
  fwrite(&top, sizeof(int), 1, fptr);
  fwrite(&right, sizeof(int), 1, fptr);
  fwrite(&bottom, sizeof(int), 1, fptr);

  fwrite(scn_image, (right - left + 1), (bottom - top + 1) * sizeof(int),
        fptr);
}

void ReadScreen(FILE *fptr)
{
  int scn_image[132 * 50], left, top, right, bottom;

  fread(&left, sizeof(int), 1, fptr);
  fread(&top, sizeof(int), 1, fptr);
  fread(&right, sizeof(int), 1, fptr);
  fread(&bottom, sizeof(int), 1, fptr);

  fread(scn_image, (right - left + 1), (bottom - top + 1) * sizeof(int),
        fptr);

    puttext(left, top, right, bottom, scn_image);
}


--
Wayne A. King 
(ba994@torfree.net, wayne.king@ablelink.org, 
 waking@idirect.com, Wayne_A_King@compuserve.com)

.