import time
import win32gui, win32ui, win32con, win32api
def window_capture(filename):
  hwnd = 0 # 窗口的编号，0号表示当前活跃窗口
  # 根据窗口句柄获取窗口的设备上下文DC（Divice Context）
  hwndDC = win32gui.GetWindowDC(hwnd)
  # 根据窗口的DC获取mfcDC
  mfcDC = win32ui.CreateDCFromHandle(hwndDC)
  # mfcDC创建可兼容的DC
  saveDC = mfcDC.CreateCompatibleDC()
  # 创建bigmap准备保存图片
  saveBitMap = win32ui.CreateBitmap()
  # 获取监控器信息
  MoniterDev = win32api.EnumDisplayMonitors(None, None)
  w = MoniterDev[0][2][2]
  h = MoniterDev[0][2][3]
  # print w,h　　　#图片大小
  # 为bitmap开辟空间
  saveBitMap.CreateCompatibleBitmap(mfcDC, w, h)
  # 高度saveDC，将截图保存到saveBitmap中
  saveDC.SelectObject(saveBitMap)
  # 截取从左上角（0，0）长宽为（w，h）的图片
  saveDC.BitBlt((0, 0), (w, h), mfcDC, (0, 0), win32con.SRCCOPY)
  saveBitMap.SaveBitmapFile(saveDC, filename)
beg = time.time()
for i in range(10):
  window_capture("haha.jpg")
end = time.time()
print(end - beg)

import time
import numpy as np
from PIL import ImageGrab
# 每抓取一次屏幕需要的时间约为1s,如果图像尺寸小一些效率就会高一些
beg = time.time()
debug = False
for i in range(10):
  img = ImageGrab.grab(bbox=(250, 161, 1141, 610))
  img = np.array(img.getdata(), np.uint8).reshape(img.size[1], img.size[0], 3)
end = time.time()
print(end - beg)

from selenium import webdriver
import time
def capture(url, filename="capture.png"):
  browser = webdriver.Chrome(r"C:\Users\weidiao\Desktop\chromedriver_win32\chromedriver.exe")
  browser.set_window_size(1200, 900)
  browser.get(url) # Load page
  browser.execute_script("""
  (function () {
   var y = 0;
   var step = 100;
   window.scroll(0, 0);
   function f() {
    if (y < document.body.scrollHeight) {
     y += step;
     window.scroll(0, y);
     setTimeout(f, 50);
    } else {
     window.scroll(0, 0);
     document.title += "scroll-done";
    }
   }
   setTimeout(f, 1000);
  })();
 """)
  for i in range(30):
    if "scroll-done" in browser.title:
      break
    time.sleep(1)
  beg = time.time()
  for i in range(10):
    browser.save_screenshot(filename)
  end = time.time()
  print(end - beg)
  browser.close()
capture("https://www.jb51.net")

from PIL import ImageGrab
im = ImageGrab.grab()
im.save('F:\\12.png')