Subj : Re: read foregrnd  / backgrnd colors
To   : borland.public.cpp.borlandcpp
From : "Ed Mulroy [TeamB]" <ed@mulroyREMOVETHESECHARS.org>
Date : Tue Aug 26 2003 08:01 pm

I've watched this thread for some time and I do not understand why would be
trying to delve under the language to work with the underlying firmware and
hardware when he has not yet gotten a full handle on the language.  I also
do not understand why he would go to so much trouble to be be able to work
with an obsolete operating system.

If you must use the video interrupts yourself instead of the functions
prototyped in CONIO.H which easily do all that for you then it probably
would look something like this C program:

------------------------------------------
  #include <stdio.h>
  #include <stdlib.h>
  #include <dos.h>

  int screen_width;
  int screen_height;
  int current_page;

  unsigned char far *rows_minus_one_ptr = MK_FP(0x40, 0x84);

  #define BLINKING 0x80

  void GetScreenSize(void)
    {
    union REGS r;

    r.h.ah = 0xF;
    int86(0x10, &r, &r);
    screen_width = r.h.ah;
    current_page = r.h.bh;
    screen_height = *rows_minus_one_ptr + 1;
    }

  #pragma startup GetScreenSize

  void WhereXY(int *x, int *y)
    {
    union REGS r;

    r.h.ah = 3;
    r.h.bh = current_page;
    int86(0x10, &r, &r);
    *y = r.h.dh + 1;
    *x = r.h.dl + 1;
    }

  void GoToXY(int x, int y)
    {
    if ((x > 0) && (x <= screen_width) &&
        (y > 0) && (y <= screen_height))
      {
      union REGS r;

      r.h.ah = 2;
      r.h.bh = 0;
      r.h.dh = y - 1;
      r.h.dl = x - 1;
      int86(0x10, &r, &r);
      }
    }

  int main()
    {
    char *msg = NULL;
    int   orig_x;
    int   orig_y;
    int   result = EXIT_SUCCESS;
    FILE *fout = fopen("ScnData.TXT", "wt");

    /* save original cursor position */
    WhereXY(&orig_x, &orig_y);

    if (!fout) /* if fopen failed */
      {
      msg = "Error: unable to open output file\n";
      result = EXIT_FAILURE;
      }
    else /* fopen succeeded */
      {
      int x;
      int y;

      fputs("Screen characters and attributes\n"
            "[x, y] char  foreground color  background color\n", fout);

      for (y = 1; y <= screen_height; ++y)
        {
        for (x = 1; x <= screen_width; ++x)
          {
          union REGS r;
          int        fg;
          int        bg;
          char     *other;

          GoToXY(x, y);
          r.h.ah = 8; /* read char & attrib at cursor */
          r.h.bh = current_page;
          int86(0x10, &r, &r);
          fg = r.h.ah & 0xF; /* fg color is lower 4 bits */
          bg = (r.h.ah >> 4) & 7; /* bg is next 3 bits */

          if (r.h.ah & BLINKING)
            other = "Blinking";
          else
            other = " ";

          fprintf(fout, "[%3d, %3d] \'%c\' %02X %02X %s\n",
                  x, y, r.h.al, fg, bg, other);
          }
        }

      fclose(fout);
      }

    GoToXY(orig_x, orig_y);

    if (msg)
      printf(msg);

    return result;
    }
------------------------------------------

..  Ed

> Rob C. wrote in message
>  news:3f4bd67b$1@newsgroups.borland.com...

.