诅咒得到箭头键

Question

In trying to get input from the arrow keys via curses (ncurses) it won't catch as KEY_UP etc. I used the keypad function with a true argument but getch still returns an escaped sequence. How do I sift through the values returned by getch() and grab the arrow keys specifically?

Answer 1

I was storing getch() calls as char's when they were supposed to be int's. Works perfectly after the switch.

Answer 2

我在Mac OS X上发现了同样的问题。但是通过添加以下内容解决了这个问题：

keypad(stdscr, TRUE);

Answer 3

Standard (VT100-like) terminals send a sequence of characters when the arrow keys are pressed. You just have to keep track of whether or not these are pressed in sequence. Here are the char's to watch for:

Down Arrow  0x1B 0x5B 0x42
Left Arrow  0x1B 0x5B 0x44
Right Arrow 0x1B 0x5B 0x43
Up Arrow    0x1B 0x5B 0x41