OpenCV Python:如何检测窗口是否关闭? [英] OpenCV Python: How to detect if a window is closed?

问题描述

我有以下代码:

total_frames = 50
cv2.cv.NamedWindow("Dragonfly Simulation")
cv2.cv.StartWindowThread()
for i in range(total_frames):
    # do stuff
    img_name = # something
    img = cv2.cv.LoadImage(img_name)
    cv2.cv.ShowImage("Dragonfly Simulation", img)
    cv2.cv.WaitKey(2)
cv2.cv.DestroyWindow("Dragonfly Simulation")
cv2.cv.WaitKey(1)
# rest of code

那它是怎么做的:

1. 打开一个窗口
2. 循环显示在窗口上的图像
3. 完成后，关闭窗口
4. 运行其余代码

但是在这种情况下，我之前已经给出了total_frame.我不要那个.

However in this case I have the total_frame given before. I don't want that.

相反，我需要执行以下操作的代码:

Instead, I want a code that does the following:

1. 打开一个窗口
2. 循环显示在窗口上的图像
3. 等待用户关闭该窗口
4. 当用户关闭该窗口时，退出循环，继续执行其余代码.

但是，我在OpenCV中找不到可以检测用户何时关闭窗口的功能.有人可以建议解决方法吗?

However, I cannot find a function in OpenCV that can detect when user closes a window. Can anyone suggest a workaround please?

推荐答案

除了等待按键，我只是在寻找一种使用窗口的X按钮检测窗口何时关闭的方法，但是我在任何地方都找不到答案(IsWindowVisible和cvGetWindowHandle在Python cv2模块中不可用).

I was just looking for a way to detect when the window has been closed using the X button of the window in addition to waiting for a key press, but I couldn't find an answer anywhere (IsWindowVisible and cvGetWindowHandle are not available in the Python cv2 module).

所以我玩了，这是它的工作方式:

So I played around and this is how it works:

while cv2.getWindowProperty('window-name', 0) >= 0:
    keyCode = cv2.waitKey(50)
    # ...

cv2.getWindowProperty()在关闭窗口后立即返回-1.

cv2.getWindowProperty() returns -1 as soon as the window is closed.

有关说明，请参见 :获取具有索引0的标志是全屏属性，但实际上使用哪个标志都没有关系，一旦关闭窗口，它们都将变为-1.

For explanation, see the documentation for the enumeration of cv::WindowPropertyFlags: getting the flag with index 0 is the fullscreen property, but actually it doesn't matter which flag to use, they all become -1 as soon as the window is closed.

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