Question

display single character

Asked by: kennethtan

how can i display single character from keyboard entry immediately without entering the carriage return key, the UNIX workstation that i am using does not provide getch() but only getchar() (which requires a carriage return to be entered before displaying the keyboard entry)

how can i also read extended ASCII code, ie, 'up' arrow is being pressed ?

all codes be written in C

advance thanks

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Asked On
2000-02-29 at 08:10:33ID10302919
Tags

c

Topic

C Programming Language

Participating Experts
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Answers

 

by: curriPosted on 2000-02-29 at 11:41:01ID: 2570194

There is NO portable, standard way to do this in C (since it is highly system dependant). However, most unix systems have ways to do that (they are not necessarily simple though :). The best solution for me has been using the 'curses' library. Type 'man curses' or 'man ncurses' to get help on it.

 

by: curriPosted on 2000-02-29 at 11:47:04ID: 2570213

They are asking the same thing, in the context of linux(which is essentially a unix clone). Check:

http://www.experts-exchange.com/jsp/qShow.jsp?ta=linuxprog&qid=10295916

 

by: IexpertPosted on 2000-03-01 at 04:58:23ID: 2572360

 

by: IexpertPosted on 2000-03-01 at 05:02:35ID: 2572378

 

by: marcjbPosted on 2000-03-01 at 12:56:34ID: 2574205

Use the curses library
Compile with -lcurses

     #include<stdio.h>
     #include<curses.h>

     int main()
     {
     int c;

     initscr();
     cbreak();
     noecho();

     c = getch();
     printf("\nc is %c\n", (char)c);
     printf("c is %i\n", c);

     endwin();
     return 0;
     }

 

by: kennethtanPosted on 2000-03-02 at 04:59:45ID: 2576290

reject because, the UNIX system that i am using does not allow me to use getch(), ie, i can only use getchar().

thanks

 

by: KangaRooPosted on 2000-03-03 at 04:50:29ID: 2579850

It appears that UNXGETCH implements getch(). Did you try it?

 

by: nadtPosted on 2000-03-03 at 11:40:05ID: 2581364

Try following code, this works:-

char readkey(int *isfunc)
{
  char temp;

  temp=getchar();
  if (temp==0)
  {
    *isfunct=0;
    temp=getchar();
  }
  return(temp);
}
 
use this function as-is in your program.  If the program wants to know which key has been hit , just say:-

  What_key=readkey(function_key);
 
now process what_key.  If it is up arrow or down arrow or some function key them `function_key' will be set to zero or else will have a trash value.  

Hope this helps
nadt

 

by: IexpertPosted on 2000-03-06 at 09:38:32ID: 2588442

? I posted a portable getch() for UNIX ! ?

 

by: KangaRooPosted on 2000-03-08 at 02:03:47ID: 2595282

??

20120131-EE-VQP-002

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