[irfan_furion]

i am trying to write a code in c that changes the result of keystrokes by using keyboard buffer.
Here is what the programme will do...

if user presses "A" the result would be somthing else, like any other letter except "A"
the code that i have written so no errors but it also does'nt give any output
Herz the code....

i am using borland compiler to run the code......

#include<stdio.h>
#include<conio.h>
#include<bios.h>
#include<dos.h>

void interrupt (*oldint15)();
void interrupt newint15(unsigned int BP,unsigned int DI,
			unsigned int SI,unsigned int DS,
			unsigned int ES,unsigned int DX,
			unsigned int CX,unsigned int BX,
			unsigned int AX,unsigned int CS,
			unsigned int IP,unsigned int flags);
void main()
{
oldint15 = getvect(0x15);
setvect(0x15,newint15);
keep(0,1000);
getch();
}
void interrupt newint15(unsigned int BP,unsigned int DI,
			unsigned int SI,unsigned int DS,
			unsigned int ES,unsigned int DX,
			unsigned int CX,unsigned int BX,
			unsigned int AX,unsigned int CS,
			unsigned int IP,unsigned int flags)
{
if(*(((char*)&AX)+1)==0x4F)
{
//q to a

if(*((char*)&AX)==0x10)
*((char*)&AX)=0x1E;
else if(*((char*)&AX)==0x1E)
*((char*)&AX)=0x10;

//w to s

if(*((char*)&AX)==0x11)
*((char*)&AX)=0x1F;
else if(*((char*)&AX)==0x1F)
*((char*)&AX)=0x11;

//e to d
if(*((char*)&AX)==0x12)
*((char*)&AX)=0x20;
else if(*((char*)&AX)==0x20)
*((char*)&AX)=0x12;


//r to f
if(*((char*)&AX)==0x13)
*((char*)&AX)=0x21;
else if(*((char*)&AX)==0x21)
*((char*)&AX)=0x13;



//t to g
if(*((char*)&AX)==0x14)
*((char*)&AX)=0x22;
else if(*((char*)&AX)==0x22)
*((char*)&AX)=0x14;


//y to h
if(*((char*)&AX)==0x15)
*((char*)&AX)=0x23;
else if(*((char*)&AX)==0x23)
*((char*)&AX)=0x15;


//u to j
if(*((char*)&AX)==0x16)
*((char*)&AX)=0x24;
else if(*((char*)&AX)==0x24)
*((char*)&AX)=0x16;



//i to k
if(*((char*)&AX)==0x17)
*((char*)&AX)=0x25;
else if(*((char*)&AX)==0x25)
*((char*)&AX)=0x17;


//o to l
if(*((char*)&AX)==0x18)
*((char*)&AX)=0x26;
else if(*((char*)&AX)==0x26)
*((char*)&AX)=0x18;


}
  getch();
}

This post has been edited by irfan_furion: 21 June 2009 - 01:00 AM

[NickDMax]

Moved to C++

[erik.price]

void interrupt newint15(unsigned int BP,unsigned int DI...

You can't have multiword (space separated) function/ variable names. should be

void interrupt_newint15(etc. etc. etc.)

I didn't look through your code thoroughly, this is just the first thing that jumped out at me.

This post has been edited by erik.price: 20 June 2009 - 06:57 PM

[no2pencil]

If this is for Windows (I see you have dos.h?) I would think it's going to be easier to hook the Windows API (by process ID) rather than get access to the keyboard buffer.

[irfan_furion]

no2pencil, on 20 Jun, 2009 - 06:02 PM, said:

If this is for Windows (I see you have dos.h?) I would think it's going to be easier to hook the Windows API (by process ID) rather than get access to the keyboard buffer.

I understand.......
but this is my assignment and the idea is to use keyboard buffer and alter the effect of keystrokes as pressed....
as i mentioned in the topic if user presses "A" key on the keyboard the result should any alpahbet execpt "A"....

This post has been edited by irfan_furion: 21 June 2009 - 01:01 AM

[irfan_furion]

erik.price, on 20 Jun, 2009 - 05:56 PM, said:

void interrupt newint15(unsigned int BP,unsigned int DI...

You can't have multiword (space separated) function/ variable names. should be

void interrupt_newint15(etc. etc. etc.)

I didn't look through your code thoroughly, this is just the first thing that jumped out at me.

i think this is how interrupt functions are declared........?

[erik.price]

irfan_furion, on 21 Jun, 2009 - 04:05 AM, said:

i think this is how interrupt functions are declared........?

Oh, okay, sorry wasn't thinking. I'm not too familiar with DOS code