python如何进行截图

import time
import numpy as np
from PIL import ImageGrab

img = ImageGrab.grab(bbox=(100, 161, 1141, 610))
img = np.array(img.getdata(), np.uint8).reshape(img.size[1], img.size[0], 3)

import win32gui
hwnd_title = dict()
def get_all_hwnd(hwnd,mouse):
    if win32gui.IsWindow(hwnd) and win32gui.IsWindowEnabled(hwnd) and win32gui.IsWindowVisible(hwnd):
        hwnd_title.update({hwnd:win32gui.GetWindowText(hwnd)})

win32gui.EnumWindows(get_all_hwnd, 0)
 
for h,t in hwnd_title.items():
    if t is not "":
        print(h, t)

    from PyQt5.QtWidgets import QApplication
    from PyQt5.QtGui import *
    import win32gui
    import sys

    hwnd = win32gui.FindWindow(None, 'C:\Windows\system32\cmd.exe')
    app = QApplication(sys.argv)
    screen = QApplication.primaryScreen()
    img = screen.grabWindow(hwnd).toImage()
    img.save("screenshot.jpg")

import pyautogui
import cv2

img = pyautogui.screenshot(region=[0,0,100,100]) # x,y,w,h
# img.save('screenshot.png')
img = cv2.cvtColor(np.asarray(img),cv2.COLOR_RGB2BGR)