Python 屏幕截图

Question

我正在尝试编写一个程序来使用全局热键进行屏幕截图。下面是对应的代码：from datetime import datetimeimport osfrom pynput import keyboardimport pyautoguiimport pathlibdef on_activate():    today = datetime.now()    d = today.strftime("%Y-%m-%d-%H-%M-%S")    myScreenshot = pyautogui.screenshot(region=(200,200, 1720, 800))    time_stamp = '{:%y%d%m}'.format(today)    fpath = pathlib.Path("C:","Users","Desktop","TestScreenCap", time_stamp)    if not os.path.exists(fpath):        os.makedirs(fpath)    myScreenshot.save(pathlib.Path(fpath,d,".jpg"))def for_canonical(f):    return lambda k: f(l.canonical(k))hotkey = keyboard.HotKey(    keyboard.HotKey.parse('<ctrl>+<alt>+h'),    on_activate)with keyboard.Listener(        on_press=for_canonical(hotkey.press),        on_release=for_canonical(hotkey.release)) as l:    l.join()错误信息：Unhandled exception in listener callbackTraceback (most recent call last):  File "C:\Users\PycharmProjects\untitled1\venv\lib\site-packages\PIL\Image.py", line 2138, in save format = EXTENSION[ext]KeyError: ''The above exception was the direct cause of the following exception:Traceback (most recent call last):  File "C:\Users\PycharmProjects\untitled1\venv\lib\site-packages\pynput\_util\__init__.py", line 211, in inner    return f(self, *args, **kwargs)  File "C:\Users\PycharmProjects\untitled1\venv\lib\site-packages\pynput\keyboard\_win32.py", line 280, in _process self.on_press(key)  File "C:\Users\PycharmProjects\untitled1\venv\lib\site-packages\pynput\_util\__init__.py", line 127, in inner    if f(*args) is False:  File "C:/Users/PycharmProjects/untitled1/123.py", line 18, in <lambda>    return lambda k: f(l.canonical(k))  File "C:\Users\PycharmProjects\untitled1\venv\lib\site-packages\pynput\keyboard\__init__.py", line 182, in press

Answer 1

这里是固定代码：

from datetime import datetime

import os

from pynput import keyboard

import pyautogui

import pathlib

def on_activate():

    today = datetime.now()

    d = today.strftime("%Y-%m-%d-%H-%M-%S")

    myScreenshot = pyautogui.screenshot(region=(200,200, 1720, 800))

    time_stamp = '{:%y%d%m}'.format(today)

    fpath = pathlib.Path("C:\\","Users","Desktop","TestScreenCap", time_stamp)

    if not os.path.exists(fpath):

        os.makedirs(fpath)

    myScreenshot.save(pathlib.Path(fpath,d + ".jpg"))

def for_canonical(f):

    return lambda k: f(l.canonical(k))

hotkey = keyboard.HotKey(

    keyboard.HotKey.parse('<ctrl>+<alt>+h'),

    on_activate)

with keyboard.Listener(

        on_press=for_canonical(hotkey.press),

        on_release=for_canonical(hotkey.release)) as l:

    l.join()

问题是您正在使用：

myScreenshot.save(pathlib.Path(fpath,d,".jpg"))

该函数pathlib.Path(fpath,d,".jpg")将字符串添加\到每个字符串的末尾，因此您尝试保存文件的路径是：

C:Users\Desktop\TestScreenCap\200309\2020-09-03-16-50-20\.jpg

正如您所看到的，文件名是引发异常的扩展名。

只需替换为：myScreenshot.save(pathlib.Path(fpath,d + ".jpg"))

指定路径的另一个问题是它C:被解释为Drive，所以当你保存函数时，保存到你的程序当前运行的路径，而不是真正的指定路径。要修复此部分，只需替换C:为C:\\.

阅读您的代码，我认为您希望将屏幕截图保存在当前用户桌面中，如果是这样，请将行：替换为fpath = pathlib.Path("C:\\","Users","Desktop","TestScreenCap", time_stamp)并fpath = pathlib.Path(os.path.join(os.path.join(os.environ['USERPROFILE']), 'Desktop'), time_stamp)在顶部添加import os. 有了这个，你就不需要关心这条道路的正确世代。