使用编写我自己的 kbhit 版本<ncurses.h>用于 linux

Question

bool kbhit(void)
{
   // function without the 4 lines of code below will not work
   // but they also screw up the console
   initscr();             
   cbreak();
   noecho();
   nodelay(stdscr, TRUE);

    scrollok(stdscr, TRUE);
    int ch = getch();
    if (ch != ERR) {
        ungetch(ch);
        refresh();
        return true;
    } else {
        refresh();
        return false;
    }
}

Since ncurses do not have kbhit, I found the function above. But they screw up the console. This is what happens when I try to print the follow: See picture

Answer 1

That's called "staircasing".

The example of kbhit starts curses, but does not exit from curses (using endwin ). If your program tries using non-curses calls such as printf , the terminal will still be in raw mode — and that will persist after exiting to the shell (unless something resets the terminal).