如何使用python在不切换选项卡的情况下获取背景窗口的屏幕截图

我正在编写一个简单的脚本，每1秒截图一次背景窗口。从截图中捕捉特定的图像。但在谷歌搜索了好几个小时后，我发现很难截屏背景窗口。 我试过了

但每次只返回黑屏。下面的代码也是如此

import win32gui
import win32ui
from ctypes import windll
from PIL import Image

hwnd = win32gui.FindWindow(None, "Calculator")
print(hwnd)
# Change the line below depending on whether you want the whole window
# or just the client area.
#left, top, right, bot = win32gui.GetClientRect(hwnd)
left, top, right, bot = win32gui.GetWindowRect(hwnd)
w = right - left
h = bot - top

hwndDC = win32gui.GetWindowDC(hwnd)
mfcDC = win32ui.CreateDCFromHandle(hwndDC)
saveDC = mfcDC.CreateCompatibleDC()

saveBitMap = win32ui.CreateBitmap()
saveBitMap.CreateCompatibleBitmap(mfcDC, w, h)

saveDC.SelectObject(saveBitMap)

# Change the line below depending on whether you want the whole window
# or just the client area.
#result = windll.user32.PrintWindow(hwnd, saveDC.GetSafeHdc(), 1)
result = windll.user32.PrintWindow(hwnd, saveDC.GetSafeHdc(), 1)
print(result)

bmpinfo = saveBitMap.GetInfo()
bmpstr = saveBitMap.GetBitmapBits(True)

im = Image.frombuffer(
    'L',
    (bmpinfo['bmWidth'], bmpinfo['bmHeight']),
    bmpstr, 'raw', 'L', 0, 1)

win32gui.DeleteObject(saveBitMap.GetHandle())
saveDC.DeleteDC()
mfcDC.DeleteDC()
win32gui.ReleaseDC(hwnd, hwndDC)

if result == 1:
    #PrintWindow Succeeded
    im.save("test.png")

我知道如何获得切换标签的屏幕截图，但我想要不切换标签的屏幕截图

import pyautogui
import win32gui


def screenshot(window_title=None):
    if window_title:
        hwnd = win32gui.FindWindow(None, window_title)
        if hwnd:
            win32gui.SetForegroundWindow(hwnd)
            x, y, x1, y1 = win32gui.GetClientRect(hwnd)
            x, y = win32gui.ClientToScreen(hwnd, (x, y))
            x1, y1 = win32gui.ClientToScreen(hwnd, (x1 - x, y1 - y))
            im = pyautogui.screenshot(region=(x, y, x1, y1))
            return im
        else:
            print('Window not found!')
    else:
        im = pyautogui.screenshot()
        return im


im = screenshot('Calculator')
if im:
    im.show()

---

我认为这是可能的，因为一些录音节目可以做到这一点。请帮帮我。

import pyautogui
import win32gui


def screenshot(window_title=None):
    if window_title:
        hwnd = win32gui.FindWindow(None, window_title)
        if hwnd:
            win32gui.SetForegroundWindow(hwnd)
            x, y, x1, y1 = win32gui.GetClientRect(hwnd)
            x, y = win32gui.ClientToScreen(hwnd, (x, y))
            x1, y1 = win32gui.ClientToScreen(hwnd, (x1 - x, y1 - y))
            im = pyautogui.screenshot(region=(x, y, x1, y1))
            return im
        else:
            print('Window not found!')
    else:
        im = pyautogui.screenshot()
        return im


im = screenshot('Calculator')
if im:
    im.show()