pyautogui和win32gui截图背景窗口

Question

我正在尝试用pyautogui拍摄特定背景窗口的截图，而不是把它放在前台，我该怎么做呢？这是我开始的项目，但我不知道下一步是什么

在本例中，chrome.exe在后台运行，我尝试在不将窗口置于前台的情况下进行截图。

谢谢

#pip install pywin32

import pyautogui
import win32gui, win32api, win32con
import time

def takescreen():
    myScreenshot = pyautogui.screenshot()
    myScreenshot.save(r'screenshoot.png')

hwnd = win32gui.FindWindow(None, 'Chrome')
hwndChild = win32gui.GetWindow(hwnd, win32con.GW_CHILD)
hwndChild2 = win32gui.GetWindow(hwndChild, win32con.GW_CHILD)


##NEXT STEP

Answer 1

pyautogui只能捕获屏幕。我们可以使用win32ui.createBitmap()截图背景窗口。通过一些修改来复制original answer，以避免其注释中所述的黑图问题：

def takescreen(hwnd,width,height,filename):
    #hwnd is window handle
    #width, height are in pixels
    #filename is name of screenshot file
    
    hwndDC = win32gui.GetWindowDC(hwnd)
    mfcDC  = win32ui.CreateDCFromHandle(hwndDC)
    saveDC = mfcDC.CreateCompatibleDC()
   
    saveBitMap = win32ui.CreateBitmap()
    saveBitMap.CreateCompatibleBitmap(mfcDC, width, height)    
    saveDC.SelectObject(saveBitMap)    
    result = windll.user32.PrintWindow(hwnd, saveDC.GetSafeHdc(), 2)
    bmpinfo = saveBitMap.GetInfo()
    bmpstr = saveBitMap.GetBitmapBits(True)
    im = Image.frombuffer(
        'RGB',
        (bmpinfo['bmWidth'], bmpinfo['bmHeight']),
        bmpstr, 'raw', 'BGRX', 0, 1)
    
    win32gui.DeleteObject(saveBitMap.GetHandle())
    saveDC.DeleteDC()
    mfcDC.DeleteDC()
    win32gui.ReleaseDC(hwnd, hwndDC)

    if result == 1:
        #PrintWindow Succeeded
        im.save(filename)

#sample usage
hwnd = win32gui.FindWindow(None, 'Chrome')
takescreen(hwnd,1024,768,'screenshot.png')