Learn how to a build a cloud-first strategyRegister Now

x
?
Solved

Scancodes

Posted on 1998-11-30
5
Medium Priority
?
286 Views
Last Modified: 2010-04-01
How can I get keyboard input in msdos wich get pressed keys to the keyboard buffer where I could read them afterwards? some kind of interrupt without delay? not in asm please..
0
Comment
Question by:miikkal
5 Comments
 
LVL 2

Expert Comment

by:pjmaze
ID: 1178905
can you use Asm ?


0
 
LVL 1

Expert Comment

by:MatthewL
ID: 1178906
Hi Miikkal;

By delay, do you mean the routine waits for the key to be pressed?


if so then int 16H, AH=1 will do the trick ( after the call AL= scan code, AH = ascii if ZF is set )

e.g.

char readChar( void )
{
    char temp= (char) 0;  // return zero if no key pressed

    asm {
                   mov ah,0x01
                   int 0x16
                   jnz skip
                   mov temp,al
           }
 
   skip:

   return( temp );
}


Matt

0
 

Author Comment

by:miikkal
ID: 1178907
Edited text of question
0
 

Author Comment

by:miikkal
ID: 1178908
Edited text of question
0
 

Accepted Solution

by:
Mithander earned 200 total points
ID: 1178909
#include<conio.h>

void main(void)
{
char ch=0;
int count = 0;
while(ch!='\n')
{
if(kbhit())
{
  ch=getch();
  cout << "You pressed the " << ch << " key." << endl;
}
cout << count << endl;
}
}

Let me know if you need something else
0

Featured Post

Free Tool: SSL Checker

Scans your site and returns information about your SSL implementation and certificate. Helpful for debugging and validating your SSL configuration.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

IntroductionThis article is the second in a three part article series on the Visual Studio 2008 Debugger.  It provides tips in setting and using breakpoints. If not familiar with this debugger, you can find a basic introduction in the EE article loc…
C++ Properties One feature missing from standard C++ that you will find in many other Object Oriented Programming languages is something called a Property (http://www.experts-exchange.com/Programming/Languages/CPP/A_3912-Object-Properties-in-C.ht…
The goal of the video will be to teach the user the difference and consequence of passing data by value vs passing data by reference in C++. An example of passing data by value as well as an example of passing data by reference will be be given. Bot…
The viewer will learn how to use the return statement in functions in C++. The video will also teach the user how to pass data to a function and have the function return data back for further processing.
Suggested Courses

810 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question