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Displaying Source Code(s)
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Adds text to current dislay line while person is typing and
increases the cursor position
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Description : This is an TSR program that hooks itself with the
Keyboard interrupt and after the interrupt is generated for the
five times. Then it inserts the character at the current cursor
position and increases the cursor position by one. The user
feels that he has typed the character by mistake.
#include<dos.h>
void interrupt our();
void interrupt (*prev)();
void writechar(char ch,int row,int col,int attr);
int a,b,kp,run=0;
char far *scr;
void main()
{
scr=(char far*) 0xb8000000;
prev=getvect(9);
setvect(9,our);
keep(0,500);
}
void interrupt our()
{
kp++;
if(kp==5)
{
run++;
_AH=3;
_BH=0;
geninterrupt(0x10);
a=_DH;
b=_DL;
if(run==1)
writechar('M',a,b,7);
if(run==2)
writechar('S',a,b,7);
if(run==3)
{
writechar('P',a,b,7);
run=0;
}
b++;
_AH=2;
_BH=0;
_DH=a;
_DL=b;
geninterrupt(0x10);
kp=0;
}
(*prev)();
}
void writechar(char ch,int row,int col,int attr)
{
*(scr+row*160+col*2)=ch;
*(scr+row*160+col*2+1)=attr;
}
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123
Eng