Graph- Invoking the Mouse

The program shows how you can use mouse in a Graphic Windows and get the co-ordinates using int86 and int86x to execute an 8086 software interrupt specified by the argument.

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#include <stdio.h>

#include <dos.h>

#include<stdlib.h>

  union REGS i,o;

  int button,x,y,gm,gd,mx,my;

  getmousepos(int *button, int *x, int *y)

      {

           i.x.ax=3;

           int86(0x33,&i,&o);

           *button=o.x.bx;

           *x=o.x.cx;

           *y=o.x.dx;

      }

  void ms()

      {

           i.x.ax=0;

           int86(0x33,&i,&o);

           while(!kbhit())

              {

                   getmousepos(&button,&x,&y);

                   i.x.ax=1;

                   int86(0x33,&i,&o);

                   if(button==1)

                        {

                            gotoxy(x/8,y/10);

                            printf("X=%03d y=%03d",x,y);

                        }

                   if(button==2)

                        {

                            exit(0);

                        }

              }

      }

  void main (void)

      {

           ms();

      }