[英]Why is the Windows prompt unresponsive after using a python curses window?
首先,我是python中的newby。 不得不在大学里选修一门课程,并被它的效率所吸引。
我遇到了一个棘手的问题,即在使用curses窗口后Windows 7提示符变得无响应。 在Windows 10中,它运作良好。 请注意,我使用的是Win7终端及其默认设置。 在我的代码中,我创建了一个curses窗口,以同时显示2个进度条,每个进度条均用于文件下载。 我通过将curses窗口传递到FileDownload类(每次下载一个类实例)来实现此目的,该类处理该窗口内的进度条。 奇怪的是,在Windows 7中,当下载完成并且控件返回到提示符时,它对键盘无响应。 我通过使用窗口后调用curses.endwin()解决了此问题,但这会导致提示一直显示在屏幕缓冲区的下方,这隐藏了curses窗口。
这是我的代码。 任何想法都将不胜感激。 谢谢!
# Skeleton version for simulations.
# Downloads 2 files simultaneously and shows a progress bar for each.
# Each file download is a FileDownload object that interacts with a
# common curses window passed as an argument.
import requests, math, threading, curses, datetime
class FileDownload:
def __init__(self, y_pos, window, url):
# Y position of the progress bar in the download queue window.
self.__bar_pos = int(y_pos)
self.__progress_window = window
self.__download_url = url
# Status of the file download object.
self.__status = "queued"
t = threading.Thread(target=self.__file_downloader)
t.start()
# Downloads selected file and handles its progress bar.
def __file_downloader(self):
file = requests.get(self.__download_url, stream=True)
self.__status = "downloading"
self.__progress_window.addstr(self.__bar_pos + 1, 1, "0%" + " " * 60 + "100%")
size = int(file.headers.get('content-length'))
win_prompt = "Downloading " + format(size, ",d") + " Bytes:"
self.__progress_window.addstr(self.__bar_pos, 1, win_prompt)
file_name = str(datetime.datetime.now().strftime("%Y-%m-%d_%H.%M.%d"))
dump = open(file_name, "wb")
# Progress bar length.
bar_space = 58
# Same as an index.
current_iteration = 0
# Beginning position of the progress bar.
progress_position = 4
# How many iterations will be needed (in chunks of 1 MB).
iterations = math.ceil(size / 1024 ** 2)
# Downloads the file in 1MB chunks.
for block in file.iter_content(1024 ** 2):
dump.write(block)
# Progress bar controller.
current_iteration += 1
step = math.floor(bar_space / iterations)
if current_iteration > 1:
progress_position += step
if current_iteration == iterations:
step = bar_space - step * (current_iteration - 1)
# Updates the progress bar.
self.__progress_window.addstr(self.__bar_pos + 1, progress_position,
"#" * step)
dump.close()
self.__status = "downloaded"
# Returns the current status of the file download ("queued", "downloading" or
# "downloaded").
def get_status(self):
return self.__status
# Instantiates each file download.
def files_downloader():
# Creates curses window.
curses.initscr()
win = curses.newwin(8, 70)
win.border(0)
win.immedok(True)
# Download URLs.
urls = ["http://ipv4.download.thinkbroadband.com/10MB.zip",
"http://ipv4.download.thinkbroadband.com/5MB.zip"]
downloads_dct = {}
for n in range(len(urls)):
# Progress bar position in the window for the file.
y_pos = n * 4 + 1
downloads_dct[n + 1] = FileDownload(y_pos, win, urls[n])
# Waits for all files to be downloaded before passing control of the terminal
# to the user.
all_downloaded = False
while not all_downloaded:
all_downloaded = True
for key, file_download in downloads_dct.items():
if file_download.get_status() != "downloaded":
all_downloaded = False
# Prevents the prompt from returning inside the curses window.
win.addstr(7, 1, "-")
# This solves the unresponsive prompt issue but hides the curses window if the screen buffer
# is higher than the window size.
# curses.endwin()
while input("\nEnter to continue: ") == "":
files_downloader()
也许您正在使用cygwin(和ncurses):ncurses(像其他任何curses实现一样)在运行时更改终端I / O模式。 您可能看到的变化是
它进行了这些更改,以使其能够读取单个字符并更有效地使用终端。
要改回终端的正常I / O模式,可以使用endwin
功能。 reset_shell_mode
函数也将很有用。
进一步阅读:
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