Source Code File 08-05_kbhit

08-05_kbhit.c

#include <ncurses.h>
   
/* check the keyboard queue */
int kbhit()
{   
    int ch,r;
    
/* turn off blocking and echo */
    nodelay(stdscr,TRUE);
    noecho();
    
/* check for input */
    ch = getch();
    if( ch == ERR)      /* no input */
        r = FALSE;
    else                /* input */
    {           
        r = TRUE;
        /* return key to queue */
        ungetch(ch);
    }       
                
/* restore block and echo */
    echo(); 
    nodelay(stdscr,FALSE);
    return(r);
}               
        
int main()
{   
    int x;
    
    initscr();

    addstr("Tap a key while I count...\n");
    for(x=1;x<21;x++)
    {
        printw("%2d ",x);
        refresh();
        napms(500);
        if(kbhit())
            break;
    }
    addstr("\nDone!\n");
    printw("You pressed the '%c' key\n",getch());
    refresh();
    getch();

    endwin();
    return 0;
}

Output Screenshot

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