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Sep 24th, 2008

How can we get scan code in C using gcc compiler

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hi guys,

working in C using Borland Compiler we can get scan codes of keyboards keys by this code

C Syntax (Toggle Plain Text)
  ch = getch();
  if (ch == 0)
      ch = getch();
 
   printf("%d",ch);
  ch = getch();
  if (ch == 0)
      ch = getch();

   printf("%d",ch);

because when first time getch() is called, it will return the ascii code of the pressing key. when second time it called then it will return the scan code of that pressing key. So when we want to control our program with arrow keys, there ascii codes are 0 but scan codes are different.

Now while working in linux environment using gcc compiler. there is no conio.h header file in it and we have such function getch(). so how can we get the scan code for arrows and functional keys in C using gcc compiler.

Many Thanks

Asif

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Sep 24th, 2008

Re: How can we get scan code in C using gcc compiler

c Syntax (Toggle Plain Text)
#include <stdio.h>
#include <termios.h>
#include <unistd.h>
 
        int getch(){
            struct termios oldt,
                           newt;
            int ch;
            tcgetattr( STDIN_FILENO, &oldt );
            newt = oldt;
            newt.c_lflag &= ~( ICANON | ECHO );
            tcsetattr( STDIN_FILENO, TCSANOW, &newt );
            ch = getchar();
            tcsetattr( STDIN_FILENO, TCSANOW, &oldt );
 
            return ch;
        }
#include <stdio.h>
#include <termios.h>
#include <unistd.h>
    
        int getch(){
            struct termios oldt,
                           newt;
            int ch;
            tcgetattr( STDIN_FILENO, &oldt );
            newt = oldt;
            newt.c_lflag &= ~( ICANON | ECHO );
            tcsetattr( STDIN_FILENO, TCSANOW, &newt );
            ch = getchar();
            tcsetattr( STDIN_FILENO, TCSANOW, &oldt );
              
            return ch;
        }

It works for me. Enjoy

Sci@phy

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Sep 24th, 2008

Re: How can we get scan code in C using gcc compiler

Read up on ncurses if you want advanced control of a terminal environment.

Salem

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Sep 28th, 2008

Re: How can we get scan code in C using gcc compiler

Hi,
If its ok the character is echoed on the screen, you can very well go for getc(stdin) or getchar() in a while loop with the termminating condition like carriage return or something you want...

ahamed101

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Sep 28th, 2008

Re: How can we get scan code in C using gcc compiler

Here is a link which could give you some hint!!!

ssharish

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