python 后台截图

# 对后台窗口截图
import win32gui, win32ui, win32con
import cv2
import numpy


def background_capture(hWnd, save_img_path):
    # os.popen(r"C:\Users\mkn1szh\Desktop\scrcpy-win64-v1.17\scrcpy.exe")
    # os.popen("adb shell am start com.android.car.settings")
    # time.sleep(1)
    hwnd = win32gui.FindWindow("SDL_app", "aegean")
    print(hwnd)
    # 获取后台窗口的句柄，注意后台窗口不能最小化
    hWnd = win32gui.FindWindow("SDL_app", "aegean")  # 窗口的类名可以用Visual Studio的SPY++工具获取
    # 获取句柄窗口的大小信息
    # left, top, right, bot = win32gui.GetWindowRect(hWnd)
    # print(left, top, right, bot)
    width = 1456
    height = 735
    # 返回句柄窗口的设备环境，覆盖整个窗口，包括非客户区，标题栏，菜单，边框
    hWndDC = win32gui.GetWindowDC(hWnd)

    # 创建设备描述表
    mfcDC = win32ui.CreateDCFromHandle(hWndDC)

    # 创建内存设备描述表
    saveDC = mfcDC.CreateCompatibleDC()

    # 创建位图对象准备保存图片
    saveBitMap = win32ui.CreateBitmap()

    # 为bitmap开辟存储空间
    saveBitMap.CreateCompatibleBitmap(mfcDC, width, height)

    # 将截图保存到saveBitMap中
    saveDC.SelectObject(saveBitMap)

    # 保存bitmap到内存设备描述表
    saveDC.BitBlt((0, 0), (width, height), mfcDC, (0, 0), win32con.SRCCOPY)

    ###获取位图信息
    signedIntsArray = saveBitMap.GetBitmapBits(True)

    # 内存释放
    win32gui.DeleteObject(saveBitMap.GetHandle())
    saveDC.DeleteDC()
    mfcDC.DeleteDC()
    win32gui.ReleaseDC(hWnd, hWndDC)

    # 保存到文件
    img = numpy.frombuffer(signedIntsArray, dtype='uint8')
    img.shape = (height, width, 4)
    cv2.cvtColor(img, cv2.COLOR_BGRA2RGB)
    cv2.imwrite(save_img_path, img, [int(cv2.IMWRITE_JPEG_QUALITY), 100])