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.

1 2	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
1 ax=0x0002	1 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 :

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

Author : Myfordbenefits

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