CODEWITHSUNDEEP
pythonwinapiscreenshotpywin32win32gui
王常友
王常友

Reputation: 11

When I'm using BitBlt() to capture a screenshot of my explorer, the captured title bar is black and shifted position

I'm trying to capture a window by its HWND, like my explorer:

my explorer

But this is the result I get:

the screenshot

This is the function I am using:

def capture_window(hwnd):
    win32gui.ShowWindow(hwnd, win32con.SW_RESTORE)
    win32gui.SetForegroundWindow(hwnd)
    time.sleep(1)

    window_dc = win32gui.GetWindowDC(hwnd)
    dc_object = win32ui.CreateDCFromHandle(window_dc)
    compatible_dc = dc_object.CreateCompatibleDC()

    left, top, right, bottom = win32gui.GetClientRect(hwnd)
    width = right - left
    height = bottom - top

    bitmap = win32ui.CreateBitmap()
    bitmap.CreateCompatibleBitmap(dc_object, width, height)
    compatible_dc.SelectObject(bitmap)

    compatible_dc.BitBlt((0, 0), (width, height), dc_object, (0, 0), win32con.SRCCOPY)

    bmpinfo = bitmap.GetInfo()
    bmpstr = bitmap.GetBitmapBits(True)
    img = Image.frombuffer(
        "RGB", (bmpinfo["bmWidth"], bmpinfo["bmHeight"]), bmpstr, "raw", "BGRX", 0, 1
    )

    img = cv2.cvtColor(np.array(img), cv2.COLOR_BGR2RGB)

    win32gui.DeleteObject(bitmap.GetHandle())
    compatible_dc.DeleteDC()
    dc_object.DeleteDC()
    win32gui.ReleaseDC(hwnd, window_dc)

    return img

The title bar is black, and there is some shift in its position.

Some windows seem alright, but some are not (like explorer). What is causing this?

I tried to fix it with changing win32gui.GetClientRect() to win32gui.GetWindowRect(), but it didn't work. I am expecting it can capture a same image.

Upvotes: 1

Views: 59

Answers (0)

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