win32gui.FindWindow - 黑屏

如何解决win32gui.FindWindow - 黑屏

在编写代码时遇到问题。 win32gui.FindWindow 通过标题找到我需要的窗口，但并非所有应用程序都显示出来。例如 Steam 和 Discord - 显示黑屏，没有别的。例如，记事本应用程序 - 捕获和显示没有问题。我使用的是OpenCV库进行展示，imshow()展示了多张截图。

有什么问题？

class WindowCapture:
w = 0
h = 0
hwnd = None
cropped_x = 0
cropped_y = 0
offset_x = 0
offset_y = 0

def __init__(self,window_name=None):
    if window_name is None:
        self.hwnd = win32gui.GetDesktopWindow()
    else:
        self.hwnd = win32gui.FindWindow(None,window_name)
        if not self.hwnd:
            raise Exception('Window not found: {}'.format(window_name))

    # Получаем размер окна.
    window_rect = win32gui.GetWindowRect(self.hwnd)
    self.w = window_rect[2] - window_rect[0]
    self.h = window_rect[3] - window_rect[1]

    # Учитывая границу окна и заголовка,обрезать их.
    border_pixels = 8
    titlebar_pixels = 30
    self.w = self.w - (border_pixels * 2)
    self.h = self.h - titlebar_pixels - border_pixels
    self.cropped_x = border_pixels
    self.cropped_y = titlebar_pixels

    self.offset_x = window_rect[0] + self.cropped_x
    self.offset_y = window_rect[1] + self.cropped_y

def get_screenshot(self):
    wDC = win32gui.GetWindowDC(self.hwnd)
    dcObj = win32ui.CreateDCFromHandle(wDC)
    cDC = dcObj.CreateCompatibleDC()
    dataBitMap = win32ui.CreateBitmap()
    dataBitMap.CreateCompatibleBitmap(dcObj,self.w,self.h)
    cDC.SelectObject(dataBitMap)
    cDC.BitBlt((0,0),(self.w,self.h),dcObj,(self.cropped_x,self.cropped_y),win32con.SRCCOPY)

    signedIntsArray = dataBitMap.GetBitmapBits(True)
    img = np.fromstring(signedIntsArray,dtype='uint8')
    img.shape = (self.h,4)
    #dataBitMap.SaveBitmapFile(cDC,'debug.bmp')

    dcObj.DeleteDC()
    cDC.DeleteDC()
    win32gui.ReleaseDC(self.hwnd,wDC)
    win32gui.DeleteObject(dataBitMap.GetHandle())

    img = img[...,:3]

    img = np.ascontiguousarray(img)

    return img