From: "J. L." <jlsgarrido AT inbox DOT lv>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: problem with mouse
Date: Wed, 2 Jul 2003 16:23:52 -0500
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Message-ID: <bdvihe$116imd$1@ID-143309.news.dfncis.de>
References: <001201c340bc$f8096360$0105a8c0 AT luiz>
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To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com

Once upon a while, Luiz Rafael Culik Guimaraes <culikr AT uol DOT com DOT br>
wrote in 001201c340bc$f8096360$0105a8c0 AT luiz:

> Dear Friends
>
> I has an problem with mouse
> using the follow function
>
> int getpos(void)
> {
> union REGS r;
> r.x.ax=3;
> int86(0x33&r,&r);
> return r.x.cx/8;
> }
>
> this return weird numbers like 132514, 125465

I hope not sound stupid, but... did you initialize the mouse?

> I´m using an Amd Duron Processor and an Geoforce 2 mx 400.
>
> is this related
>

I don't believe it.

> Regards
> Luiz

The follow snipet is based on the code in thread suggested before:

----begin C code ----

#include <pc.h>
#include <dos.h>
#include <conio.h>

int mouse_installed=0;

void mouse_show(void)
{
   union REGS r;

   r.x.ax = 0x01;
   int86(0x33, &r, &r);
}

void mouse_hide(void)
{
   union REGS r;

   r.x.ax = 0x02;
   int86(0x33, &r, &r);
}

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

   r.x.ax = 4;
   r.x.cx = x;
   r.x.dx = y;
   int86(0x33, &r, &r);

}


void mouse_init(void){
   int res;
   union REGS r;

   r.x.ax=0;
   res=int86(0x33, &r,&r);

   if(res==0xFFFF) mouse_installed = 1;
   else mouse_installed = 0;
}


void getpos(int *col, int *row){
  union REGS r;
  r.x.ax=3;

  int86(0x33, &r,&r);
  *col=r.x.cx/8;
  *row=r.x.dx/8;
}

int mouse_buttons(void){
  union REGS r;
  r.x.ax=5;

  int86(0x33, &r,&r);

  return r.x.bx;
}

int main(void){

  int test, pos, x=0, y=0;

  clrscr();
  gotoxy(1,1);
  mouse_init();

  if(mouse_installed){
    mouse_show();
    while (!kbhit()){
      printf("posici˘n del raton: columna %2d; rengl˘n %2d\r", x,
y);
      getpos(&x, &y);
    }
  }
  return 0;
}

----end C code --------------

Not so clean, but works. Hope this helps.

Regards
-- 
José L. Sánchez Garrido