Curses键盘(True)没有获得特殊键

时间:2017-03-12 21:01:18

标签: python-2.7 python-3.x linuxmint python-curses

我正在尝试为Python 2和3编写代码。这是我用来学习curses的完整代码:

# -*- coding: utf-8 -*-
from __future__ import print_function

import curses
import sys
import traceback


class Cursor(object):
    def __init__(self):
        self.stdscr = curses.initscr()
        curses.noecho()
        curses.cbreak()
        self.stdscr.keypad(True)

    def end_window(self):
        curses.nocbreak()
        self.stdscr.keypad(False)
        curses.echo()
        curses.endwin()

    def start_win(self, begin_x=0, begin_y=1, height=24, width=71):
        return curses.newwin(height, width, begin_y, begin_x)


def applic():
    print("yo man")
    x = Cursor()
    window = x.start_win()
    try:
        # This raises ZeroDivisionError when i == 10.
        for i in range(0, 11):
            v = i - 10
            key = window.getch()
            # EDIT - Added this debug line to verify what key gets
            window.addstr('type of {} is {}\n'.format(key, type(key)))
            if key == curses.KEY_UP:
                return
            window.addstr('10 divided by {} is {}\n'.format(v, 10 // v))
            window.refresh()

    except Exception:
        x.end_window()
        errorstring = sys.exc_info()[2]
        traceback.print_tb(errorstring)

applic()

我的问题是key永远不会等于curses.KEY_UP,因为getch()(或getkey())返回单个字符串,而不是整个转义键代码等于KEY_UP({{1} })。因此,每次按下例程中的向上箭头时,程序都会循环显示关键代码\x1b]A\x1b[的三个部分,并生成三行输出:

A

对于这个测试,我希望UP箭头键允许我在i等于10时发生的预期异常之前爆发。

根据Curses的python文档,10 divided by -10 is -1 10 divided by -9 is -2 10 divided by -8 is -2 应该允许返回整个密钥代码,但似乎不会这样做。

添加了一些调试打印输出信息,以显示返回的内容。无论我使用getch()还是getkey(),结果都是一样的;它返回一个字符串(文档表明将为getch返回一个整数):

stdscr.keypad(True)

1 个答案:

答案 0 :(得分:2)

问题是您在主窗口上设置了keypad属性,但是使用getch从另一个窗口读取。此更改将使您的程序接受KEY_UP

--- curses-vs-keypad.py 2017/04/02 11:07:41     1.1
+++ curses-vs-keypad.py 2017/04/03 00:57:16
@@ -28,6 +28,7 @@
     print("yo man")
     x = Cursor()
     window = x.start_win()
+    window.keypad(True)
     try:
         # This raises ZeroDivisionError when i == 10.
         for i in range(0, 11):