getch()

[_adeel]

hi
i m using this code for my getch function

Code: Select all

unsigned char agetch(){
unsigned int c=0x00;
          while(c==0x00){
                c=inportb(0x60);
          }
          return c;
}

but its not working
could some one show me how it can work
thanx for ur help

[richie]

Hello!
It's the old problem: inportb(0x60) returns the scancode and not the ASCII-Value of the pressed key. You have to translate the scancode to the ASCII-Value.
See: http://www.mega-tokyo.com/forum/index.php?board=1;action=display;threadid=3065
There was already a big discussion about getting input.

[Krisu]

There is keyboard scancodes for finnish keyboard:
http://koti.mbnet.fi/kotiweb/Keyboard.txt

[Slasher]

Is this really a good getch() function? the reason i ask is because this bypasses the keyboard driver!
And you will not be able to implement ungetch()!!?
so what of
unsigned char getch()
{
if(keypressed==TRUE) /* set in keyboard driver when a key is presses and read*/
send message(keyboard driver, get key);
return get key;
}

[Whatever5k]

Yep, the getch() function provided by _adeel isn't a good and common one as it uses polling.
I'd just do:

Code: Select all

extern kbd_queue *key_buffer;

int getch(void)
{
   return (get_next_key_from_buffer(key_buffer));
}

On every key interrupt, the ASCII key is stored in key_buffer, a getch() will just return the first character.