Hide mouse pointer using c

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C Program to Hide Mouse Pointer : Dos Programming

C Program to Hide Mouse Pointer :


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#include<graphics.h>
#include<conio.h>
#include<dos.h>
void showmouseptr();
void hidemouseptr();
union REGS i, o;
int main() {
   int count = 1, gDriver = DETECT, gMode;
   initgraph(&gDriver, &gMode,“C\:tc\bgi”);
   i.x.ax = 0;
   int86(0X33, &i, &o);
   if (o.x.ax == 0) {
      printf(“ntMouse Support is Unavailable !!”);
   } else {
      showmouseptr();
      while (count <= 10) {
         getch();
         count++;
         if (count % 2 == 0)
            hidemouseptr();
         else
            showmouseptr();
      }
   }
   getch();
   return 0;
}
void showmouseptr() {
   i.x.ax = 1;
   int86(0X33, &i, &o);
}
void hidemouseptr() {
   i.x.ax = 2;
   int86(0X33, &i, &o);
}


Explanation Of C Program :Firstly let us study some important points about interrupts handeling.

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i.x.ax = 0;
int86(0X33,&i,&o);

will check whether the mouse driver exists or not.

input output Comment
ax=0x0000 ax=0x0000 or 0xFFFF
bx=number of buttons
0x0000 installed
0xFFFF not installed

Int86() is a C function that allows to call interrupts in the program. prototype in dos.h
Int 33,0×01 : Show Mouse cursor

input output Comment
ax=0x0001 none

Int 33,0×02 : Hide Mouse Cursor

input output Comment
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ax=0x0002
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none

In and out register must be type of REGS. REGS is a built in UNION declaration in C. It is defined in the dos.h header file
Syntax :

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int86 (int intr num, union REGS *inreg, union REGS *outreg);

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