在Python中将非活动/背景窗口的区域捕获为图像

Question

如何在Python中捕获非活动窗口的特定区域？

• 它不能带来窗口前景，它必须留在后台
• 不能使用截图方法，因为其他窗口可能会妨碍
• 它必须是从顶部、左侧位置到底部定义的特定区域， 正确的位置而不是整个屏幕

我已经成功满足了两个第一个条件，但是我在最后一个条件上遇到了困难，这是我的代码

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

def capture_screen():
    hwndDC = win32gui.GetWindowDC(hwnd)
    mfcDC  = win32ui.CreateDCFromHandle(hwndDC)
    saveDC = mfcDC.CreateCompatibleDC()
    rect = win32gui.GetWindowRect(hwnd)
   
    saveBitMap = win32ui.CreateBitmap()
    saveBitMap.CreateCompatibleBitmap(mfcDC, rect[2], rect[3])  # figure a way to capture only a part of the screen instead
    saveDC.SelectObject(saveBitMap)    
    result = windll.user32.PrintWindow(hwnd, saveDC.GetSafeHdc(), 2)
    bmpinfo = saveBitMap.GetInfo()
    bmpstr = saveBitMap.GetBitmapBits(True)
    image = Image.frombuffer('RGB', (bmpinfo['bmWidth'], bmpinfo['bmHeight']), bmpstr, 'raw', 'BGRX', 0, 1)
    
    win32gui.DeleteObject(saveBitMap.GetHandle())
    saveDC.DeleteDC()
    mfcDC.DeleteDC()
    win32gui.ReleaseDC(hwnd, hwndDC)

    return image

WINDOW_NAME = 'Play Chrome Dinosaur Game Online - elgooG - Google Chrome'
hwnd = win32gui.FindWindow(None, WINDOW_NAME)

screen_capture = capture_screen()
screen_capture.save('window_capture.png')

这是正在保存的图片： 全屏恐龙

这是我的目标： 所需输出

Answer 1

我已经通过从位图缓冲区创建 NumPy 数组、重塑数组以表示图像尺寸，然后选择所需的高度范围来解决我的问题

import win32gui, win32ui
import numpy as np
from ctypes import windll
from PIL import Image

def capture_screen():
    w, h = win32gui.GetWindowRect(hwnd)[2:]
    hwndDC = win32gui.GetWindowDC(hwnd)
    mfcDC  = win32ui.CreateDCFromHandle(hwndDC)
    saveDC = mfcDC.CreateCompatibleDC()

    saveBitMap = win32ui.CreateBitmap()
    saveBitMap.CreateCompatibleBitmap(mfcDC, w, h)
    saveDC.SelectObject(saveBitMap)    
    result = windll.user32.PrintWindow(hwnd, saveDC.GetSafeHdc(), 2)
    bmpstr = saveBitMap.GetBitmapBits(True)
      
    win32gui.DeleteObject(saveBitMap.GetHandle())
    saveDC.DeleteDC()
    mfcDC.DeleteDC()
    win32gui.ReleaseDC(hwnd, hwndDC)

    img = np.frombuffer(bmpstr, dtype='uint8')
    img.shape = (h, w, 4)
    capture_game_screen = img[370:800]

    pil_img = Image.fromarray(capture_game_screen)

    return pil_img


WINDOW_NAME = 'Play Chrome Dinosaur Game Online - elgooG - Google Chrome'
hwnd = win32gui.FindWindow(None, WINDOW_NAME)

screen_capture = capture_screen()
screen_capture.show()

很想看看是否有人有更好的内存效率分辨率